CN105954504A - Method for rapidly processing alcohol qualitative signals and preliminary detection device - Google Patents

Abstract

The invention discloses a fast alcohol qualitative signal processing method. The steps are as follows: start; the subject blows air through the blowing port of the device, the microphone detects the wheat blowing, and the alcohol sensor detects the alcohol content; the microprocessor passes the preset effective blowing wheat Time and effective wheat blowing strength to judge whether the blowing wheat is successful, if yes, enter the next step, and return if not; determine the time starting point t _s and time end point t _e of blowing wheat; calculate the change rate of the alcohol content curve in the process of blowing wheat; obtain the blowing wheat The starting point corresponds to the rate of change of alcohol content I _s ; obtain the maximum value I _m of the rate of change of the alcohol content curve in the process of blowing wheat; judge whether the difference I _m ‑ I _s is greater than the set threshold I _th , if so, alarm, otherwise it is safe Prompt; judge whether to continue to use the test device, if yes, return to use, otherwise end, close the device. Using the change rate of the response curve of the alcohol sensor to qualitatively judge whether the person under test is drunk driving can quickly judge and is not affected by the environment.

Description

Fast alcohol qualitative signal processing method and preliminary testing device

technical field

The invention relates to the technical field of alcohol detection, in particular to a fast alcohol qualitative signal processing method and a preliminary detection device.

Background technique

In recent years, with the rapid development of my country's economy, the number of motor vehicles and motor vehicle drivers in the country has continued to increase, resulting in high road traffic accidents. According to statistics, more than 50% of traffic accidents are related to drunk driving. At the same time, China's traditional drinking culture is prevalent. With the implementation of the penalty for drunk driving, judging whether a motor vehicle driver is drunk or not has become the focus and difficulty of traffic law enforcement. In the context of such strong application requirements, various on-site alcohol detection devices for law enforcement have emerged as the times require.

At present, my country's traffic police generally use breath alcohol detection technology on-site law enforcement. Breath alcohol detection technology is mainly divided into five categories: semiconductor, electrochemical (fuel cell), infrared spectroscopy, colorimetry and gas chromatography. Due to the influence of factors such as cost, requirements of the use environment, and portability, three types of detection technologies, semiconductor, electrochemical, and infrared spectroscopy, are mainly used in on-site road traffic law enforcement.

Among the commonly used alcohol detection technologies, semiconductor alcohol testers generally use the gas-sensing characteristics of special semiconductors to detect alcohol. When the alcohol concentration in the measured gas increases, its resistance value will decrease, and finally reflected in the form of detectable voltage changes. However, the traditional semiconductor alcohol tester is greatly affected by the temperature of the working environment, and is also interfered by other sensitive gases in the environment. The electrochemical sensor uses the current formed during the conversion of alcohol into acetic acid on the surface of the fuel cell, and judges the amount of alcohol consumed by the fuel cell through the amplification detection of the small current, thereby detecting the alcohol content in the measured gas. The drift of the electrochemical alcohol sensor is very large, and it needs to be calibrated regularly during use, which is cumbersome to use and maintain, and the cost is high. Infrared spectrum alcohol detection technology uses the different degrees of infrared absorption of gases with different alcohol concentrations to determine the alcohol content in the detected gas.

At the same time, the national standard for breath alcohol testing has requirements for the continuity of exhalation and the minimum exhalation volume: the alcohol detector should start sampling when the volume of exhaled gas is greater than 1L, and the duration of exhaled gas during sampling should be More than 2.5 seconds; if there is an interruption in the exhalation process, the alcohol detector should send out an alarm signal; when the exhalation flow rate is less than 0.10L/s, it should be regarded as an interruption of exhalation. The wine tester must use a suitable blowpipe. When the air flow rate is 0.17L/s, the air pressure should not exceed 25hPa. In the actual law enforcement process, the tested driver does not have a good grasp of the blowing time and strength, and the response/recovery time of the sensor itself. The on-site alcohol detection and law enforcement using existing instruments is often time-consuming and laborious, which affects traffic. However, not all drivers need to carry out quantitative alcohol testing. Some traffic policemen are also aware of this problem when they are enforcing the law. Although this method can achieve the purpose of rapid and accurate screening, the possible bad breath of the driver and the irritating food eaten will bring huge physical and mental harm to the hardworking traffic police.

Contents of the invention

The purpose of the present invention is to overcome the above problems existing in the prior art, to provide a fast alcohol qualitative signal processing method and a preliminary test device, the alcohol qualitative measurement of the present invention, the reason that can realize rapid measurement is to judge by the rate of change of the alcohol content, not It is necessary to wait for the alcohol content to stabilize before making a judgment, which solves the problem that the traditional alcohol detection equipment has a long measurement time due to the long response time of the alcohol sensor, and can quickly qualitatively measure and enter the next measurement.

In order to achieve the above-mentioned technical purpose and achieve the above-mentioned technical effect, the present invention is realized through the following technical solutions:

Fast alcohol qualitative signal processing method, comprising the following steps:

Step 1, start, start the device, enter step 2;

Step 2. The subject blows air through the blowing port of the device, and the microphone blows wheat for detection. At the same time, the alcohol sensor starts to detect the alcohol content, and then enters step 3;

Step 3: After the microprocessor detects that there is a wheat blowing signal, the microprocessor judges whether the wheat blowing is successful through the preset effective wheat blowing time and effective wheat blowing force. If yes, go to step 4. If not, return Step two;

Step 4, the microprocessor determines the time starting point t _s and the time end point t _e of blowing wheat, and enters step 5;

Step 5, the microprocessor calculates the rate of change of the alcohol content curve from the starting point t _s of the wheat blowing time to the end point t _e of time, and enters step 6;

Step 6. Obtain the change rate I _s of the alcohol content corresponding to the starting point of wheat blowing, and proceed to step 7;

Step 7. Obtain the maximum value I _m of the change rate of the alcohol content curve from the starting point of blowing wheat to the end of blowing wheat, and enter step 8;

Step 8: Judging whether the difference I _m -I _s between the maximum value of the rate of change of the alcohol content curve during the process of blowing wheat and the rate of change of alcohol content at the starting point of wheat blowing is greater than the set threshold I _th , if yes, go to step 9, otherwise Go to step ten;

Step 9. The buzzer emits a rapid alarm sound, and the LED emits a flashing red light. After the alarm is over, go to step 11;

Step 10. The buzzer emits a long sound as a safety prompt, and the LED emits a flashing green light. After the prompt is over, go to step 11;

Step 11, judge whether to continue to use the test device, if yes, return to step 2, otherwise enter step 12;

Step 12, end, turn off the device.

In a preferred embodiment of the present invention, further comprising, a kind of initial test device, the initial test device comprises:

Microphone, described microphone is used for receiving the subject's blowing process, obtains blowing wheat signal, and blowing wheat signal is transmitted to microprocessor;

Alcohol sensor, described alcohol sensor is connected to described microprocessor, and described alcohol sensor is used for detecting alcohol content in air;

A buzzer, the buzzer is connected to the microprocessor, and the buzzer is used to send a prompt sound or an alarm sound;

LED, the LED is connected to the microprocessor, and the LED is used to send out a light prompt or a light alarm signal;

The microprocessor is the processing center of the preliminary testing device, and the microprocessor is used for processing the wheat blowing signal from the microphone and the alcohol content signal from the alcohol sensor.

In a preferred embodiment of the present invention, it further includes that the microphone acquires a wheat blowing detection signal, the alcohol sensor acquires an alcohol content signal, and the microprocessor acquires the wheat blowing detection signal and the alcohol content signal Finally, determine the time starting point t _s and the time end point t _e of blowing wheat, calculate the rate of change of the alcohol content curve in the process from the time starting point to the time end of blowing wheat, and the microprocessor respectively obtains the alcohol content change rate I corresponding to the starting point of blowing wheat _s and the maximum value Im of the rate of change of the alcohol content curve in the wheat blowing process, the microprocessor judges the difference between the maximum value of the rate of change of the alcohol content curve in the process of blowing wheat and the rate of change of the alcohol content of the starting point of blowing wheat I _m -I _s Whether it is greater than the set threshold I _th , the buzzer and the LED issue different sound and light prompts according to whether _{Im-I s is} greater than the set threshold I _th .

The beneficial effects of the present invention are:

One, the qualitative measurement of alcohol of the present invention, the reason that can realize rapid measurement is to judge by the rate of change of alcohol content, do not need to wait for the alcohol content to be stable before making a judgment, solve the traditional alcohol detection equipment due to the presence of alcohol sensors. Long response time, making the measurement time very long problem, can quickly qualitative measurement and move on to the next measurement.

Its two, the fast alcohol qualitative signal processing method of the present invention, is not disturbed by the environment, for example, in the drunk driving detection process, other people's drinking in the same car will lead to the situation that the air alcohol content in the car is too high, the alcohol in the environment will also cause Detected by the alcohol sensor, the present invention can avoid the interference of the alcohol content in the environment through the detection and judgment of the rate of change. No matter whether the process of the subject blowing the wheat is the sensor response stage, the saturation stable stage or the recovery stage caused by the environment, the measured The change of the alcohol response change rate produced by the subject blowing can basically maintain a positive correlation with the alcohol content of the gas blown by the subject. Therefore, it will not be disturbed by the environment, and the detection accuracy is high.

Third, the present invention judges whether the subject has successfully blown air through the process of blowing wheat, and the time and volume of blowing successfully are relatively low, which can be quickly judged.

Fourth, the present invention utilizes the change rate of the response curve of the alcohol sensor to qualitatively judge whether the person under test is drunk driving, which can quickly judge without being affected by the environment, and solves the traditional instrument detection consumption in the on-site drunk driving traffic violation inspection. Time-consuming and laborious, manual screening of problems that affect the physical and mental health of traffic police.

The above description is only an overview of the technical solutions of the present invention. In order to better understand the technical means of the present invention and implement them according to the contents of the description, the following describes the preferred embodiments of the present invention together with the accompanying drawings in detail. The specific embodiment of the present invention is given in detail by the following examples and accompanying drawings.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the technical description of the embodiments. Obviously, the accompanying drawings in the following description are only some implementations of the present invention For example, those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is method flowchart of the present invention;

Fig. 2 is a schematic diagram of the preliminary testing device of the present invention;

Figure 3 is the response curve of the alcohol sensor when the environment does not contain alcohol and the subject's breath contains alcohol;

Fig. 4 is a graph corresponding to the rate of change in Fig. 3;

Fig. 5 is the response curve of the alcohol sensor in the environmental alcohol response stage during the blowing process under the condition that the environment contains alcohol and the subject blows air containing alcohol;

Fig. 6 is a graph corresponding to the rate of change in Fig. 5;

Fig. 7 is the response curve of the alcohol sensor in the stable stage of environmental alcohol saturation during the blowing process when the environment contains alcohol and the subject blows air containing alcohol;

Fig. 8 is the corresponding rate of change graph in Fig. 7;

Fig. 9 is a graph showing the response curve of the alcohol sensor in the recovery stage of environmental alcohol during the blowing process when the environment contains alcohol and the subject blows breath containing alcohol;

FIG. 10 is a graph corresponding to the rate of change in FIG. 9 .

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Example 1

With reference to shown in Fig. 1, disclose a kind of method of fast alcohol qualitative signal processing in the present embodiment, this method comprises the following concrete steps:

Step 1, start, start the device, enter step 2;

Step 2. The subject blows air through the blowing port of the device, and the microphone blows wheat for detection. At the same time, the alcohol sensor starts to detect the alcohol content, and then enters step 3;

Step 3. After the microprocessor detects the wheat blowing signal, the above-mentioned microprocessor judges whether the wheat blowing is successful through the preset effective wheat blowing time and effective blowing force. If yes, go to step 4. If not, return to step two;

Step 4, the above-mentioned microprocessor determines the time starting point t _s and the time end point t _e of wheat blowing, and enters step 5;

Step 5, the above-mentioned microprocessor calculates the rate of change of the alcohol content curve from the starting point t _s of the wheat blowing time to the end point t _e of time, and enters step 6;

Step 6. Obtain the change rate I _s of the alcohol content corresponding to the starting point of wheat blowing, and proceed to step 7;

Step 7. Obtain the maximum value I _m of the change rate of the alcohol content curve from the starting point of blowing wheat to the end of blowing wheat, and enter step 8;

Step 8: Judging whether the difference I _m -I _s between the maximum value of the rate of change of the alcohol content curve during the process of blowing wheat and the rate of change of alcohol content at the starting point of wheat blowing is greater than the set threshold I _th , if yes, go to step 9, otherwise Go to step ten;

Step 9. The buzzer emits a rapid alarm sound, and the LED emits a flashing red light. After the alarm is over, go to step 11;

Step 10. The buzzer emits a long sound as a safety prompt, and the LED emits a flashing green light. After the prompt is over, go to step 11;

Step 11, judge whether to continue to use the test device, if yes, return to step 2, otherwise enter step 12;

Step 12, end, turn off the device.

The reason why the above-mentioned qualitative alcohol measurement method can achieve rapid measurement is that it can be judged by the rate of change of the alcohol content, and there is no need to wait for the alcohol content to stabilize before making a judgment. And the problem that makes the measurement time very long, can be quickly qualitative measurement and enter the next measurement.

The method in embodiment 1 has superiority than traditional alcohol detection method, and concrete reason is as follows:

An important reason for the long detection time of the traditional alcohol content detection device is that the alcohol sensor has a long response time, and the alcohol content is displayed only after the response process is over. next measurement.

The reason why the qualitative measurement of alcohol in Example 1 can realize rapid measurement is that the judgment can be made by the rate of change of the alcohol content, and there is no need to wait for the alcohol content to stabilize before making a judgment.

The method in Embodiment 1 is not disturbed by the environment. For example, in the detection of drunk driving, the alcohol content in the air in the car is too high due to the drinking of the fellow car driver, and the alcohol in the environment is also detected by the alcohol sensor. Embodiment 1 is based on the change of the alcohol content. It can effectively avoid environmental interference.

During the wheat blowing detection process, as shown in Figure 3-10, by comparing Figure 3 with Figure 4, Figure 5 with Figure 6, Figure 7 with Figure 8, and Figure 9 with Figure 10, regardless of whether the subject blows wheat During the process, whether the alcohol sensor is in the response stage, the saturation stable stage or the recovery stage caused by environmental alcohol factors, the change of the alcohol response change rate caused by the testee's blowing can basically keep the same as the alcohol content of the testee's blowing. into a positive correlation. Therefore, Figure 3-10 can clearly show that the interference of environmental alcohol can be effectively avoided through the detection and judgment of the rate of change.

Moreover, in embodiment 1, through the judgment of the wheat blowing process, it is judged whether the driver has successfully blown the wheat, the time and the blowing volume of the successful wheat blowing are relatively low in the whole method, the sensitivity of the microphone and the alcohol sensor is high, and it can be judged quickly. The efficiency of detection and judgment is improved.

Example 2

A kind of preliminary test device is disclosed in embodiment 2, and this device can realize the method in embodiment 1, as shown in Figure 2, this device mainly has the following several parts:

The microphone, the above-mentioned microphone is used to receive the blowing process of the subject, acquire the blowing wheat signal, and transmit the blowing wheat signal to the microprocessor.

Alcohol sensor, above-mentioned alcohol sensor is connected to above-mentioned microprocessor, and above-mentioned alcohol sensor is used for detecting the alcohol content in air.

A buzzer, the above-mentioned buzzer is connected to the above-mentioned microprocessor, and the above-mentioned buzzer is used to send out a prompt sound or an alarm sound.

LED, the above-mentioned LED is connected to the above-mentioned microprocessor, and the above-mentioned LED is used for sending out a light prompt or a light alarm signal.

The above-mentioned microprocessor is the processing center of the above-mentioned preliminary testing device, and the above-mentioned microprocessor is used for processing the blowing wheat signal from the above-mentioned microphone and the alcohol content signal from the above-mentioned alcohol sensor.

The working principle of the preliminary testing device in Example 2: the above-mentioned microphone obtains the wheat blowing detection signal, the above-mentioned alcohol sensor obtains the alcohol content signal, after the above-mentioned microprocessor obtains the above-mentioned wheat blowing detection signal and the above-mentioned alcohol content signal, determine the time for blowing the wheat The starting point t _s and the time end point _{t e} are used to calculate the rate of change of the alcohol content curve from the starting point of the wheat blowing time to the end of the time. The maximum value Im of the rate of change of the curve, the above-mentioned microprocessor judges whether the maximum value of the rate of change of the alcohol content curve during the wheat blowing process and the difference I _m -I _s of the rate of change of the alcohol content at the starting point of wheat blowing is greater than the set threshold value I _th , The above-mentioned buzzer and the above-mentioned LED send out different sound and light prompts according to whether I _m −I _s is greater than the set threshold value I _th .

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (3)

1. fast alcohol qualitative signal processing method, is characterized in that, comprises the following steps: Step 1, start, start the device, enter step 2; Step 2. The subject blows air through the blowing port of the device, and the microphone blows wheat for detection. At the same time, the alcohol sensor starts to detect the alcohol content, and then enters step 3; Step 3: After the microprocessor detects that there is a wheat blowing signal, the microprocessor judges whether the wheat blowing is successful through the preset effective wheat blowing time and effective wheat blowing force. If yes, go to step 4. If not, return Step two; Step 4, the microprocessor determines the time starting point t _s and the time end point t _e of blowing wheat, and enters step 5; Step 5, the microprocessor calculates the rate of change of the alcohol content curve from the starting point t _s of the wheat blowing time to the end point t _e of time, and enters step 6; Step 6. Obtain the change rate I _s of the alcohol content corresponding to the starting point of wheat blowing, and proceed to step 7; Step 7. Obtain the maximum value I _m of the change rate of the alcohol content curve from the starting point of blowing wheat to the end of blowing wheat, and enter step 8; Step 8: Judging whether the difference I _m -I _s between the maximum value of the rate of change of the alcohol content curve during the process of blowing wheat and the rate of change of alcohol content at the starting point of wheat blowing is greater than the set threshold I _th , if yes, go to step 9, otherwise Go to step ten; Step 9. The buzzer emits a rapid alarm sound, and the LED emits a flashing red light. After the alarm is over, go to step 11; Step 10. The buzzer emits a long sound as a safety prompt, and the LED emits a flashing green light. After the prompt is over, go to step 11; Step 11, judge whether to continue to use the test device, if yes, return to step 2, otherwise enter step 12; Step 12, end, turn off the device. 2. a preliminary testing device, which completes the fast alcohol qualitative signal processing method claimed in claim 1, is characterized in that the preliminary testing device comprises: Microphone, described microphone is used for receiving the subject's blowing process, obtains blowing wheat signal, and blowing wheat signal is transmitted to microprocessor; Alcohol sensor, described alcohol sensor is connected to described microprocessor, and described alcohol sensor is used for detecting alcohol content in air; A buzzer, the buzzer is connected to the microprocessor, and the buzzer is used to send a prompt sound or an alarm sound; LED, the LED is connected to the microprocessor, and the LED is used to send out a light prompt or a light alarm signal; The microprocessor is the processing center of the preliminary testing device, and the microprocessor is used for processing the wheat blowing signal from the microphone and the alcohol content signal from the alcohol sensor. 3. The preliminary testing device according to claim 2, wherein the microphone obtains a wheat blowing detection signal, the alcohol sensor obtains an alcohol content signal, and the microprocessor obtains the wheat blowing detection signal and the wheat blowing detection signal. After the alcohol content signal, determine the time start point t _s and the time end point t _e of blowing wheat, and calculate the change rate of the alcohol content curve in the process from the time starting point to the time end point of blowing wheat, and the microprocessor respectively obtains the alcohol content corresponding to the starting point of blowing wheat The change rate I _s and the maximum value I _m of the rate of change of the alcohol content curve in the wheat blowing process, the microprocessor judges the difference I between the maximum value of the change rate of the alcohol content curve in the process of blowing wheat and the rate of change of the alcohol content at the starting point of wheat blowing Whether _m -I _s is greater than the set threshold I _th , the buzzer and the LED issue different sound and light prompts according to whether _Im -I _s is greater than the set threshold I _th .