CN207782812U - A long-distance visible light communication transceiver system - Google Patents

Abstract

The utility model relates to a visible light communication technical field specifically discloses a remote visible light communication receiving and dispatching system, including emitter and receiving arrangement, emitter includes the sight mirror, L ED light source and collimating lens, the sight mirror is located the emitter top, L ED light source and collimating lens are located inside the emitter, L ED light source is located collimating lens's focus department, receiving arrangement includes the sight mirror, objective and detection device, the sight mirror is located the receiving arrangement top, objective includes primary mirror and secondary mirror, the secondary mirror is located the one end that receiving arrangement is close to the receiving port, locate the receiving arrangement other end in the primary mirror, and the primary mirror center is equipped with the through-hole, the through-hole is connected with detection device, detection device is equipped with image sensor, rotatable reflector and detector.

Description

A long-distance visible light communication transceiver system

technical field

The utility model relates to the technical field of visible light communication, and specifically discloses a long-distance visible light communication transceiver system.

Background technique

In visible light communication, the signal-to-noise ratio of the signal received at the receiving end is one of the important parameters that affect the quality of visible light communication. For common long-distance visible light communication systems, there is noise interference in the received information, which affects the quality of communication. How to maximize the received signal energy and minimize noise has always been a problem that needs to be considered. These technical difficulties all affect long-distance visible light communication. Applications.

For the receiving end of long-distance communication, first, the distance between the sending and receiving ends is relatively large. If the receiving end receives the wrong direction, it will not be able to receive the optical signal sent by the transmitting end; The background light signal; the third is that the long-distance atmospheric environment will cause certain interference to the transmitted light signal and cause the energy of the light signal to fluctuate randomly.

Therefore, there is an urgent need for a transceiver system that can improve the quality of long-distance visible light communication.

Contents of the invention

In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the utility model is to provide a long-distance visible light communication transceiver system.

In order to achieve the above object, the utility model adopts the following scheme.

A long-distance visible light communication transceiver system, comprising a transmitter and a receiver; the transmitter includes a sighting mirror, an LED light source and a collimating lens; the sighting mirror is arranged on the top of the transmitter; the LED light source and the collimation The camera lens is located at the inside of the transmitter, and the LED light source is located at the focal point of the collimator lens; the receiving device includes a sighting mirror, an objective lens and a detection device; the sighting mirror is arranged at the top of the receiving device; the objective lens includes a main mirror and A secondary mirror, the secondary mirror is arranged at one end of the receiving device close to the receiving port; the primary mirror is arranged at the other end of the receiving device, and the center of the primary mirror is provided with a through hole, the through hole is connected with the detection device, and the detection The device is equipped with an image sensor, a rotatable mirror and a detector.

Further, the through hole of the primary mirror and the secondary mirror are on the same straight line, and both have the same diameter.

Preferably, the primary mirror is a parabolic mirror.

Preferably, the secondary mirror is a hyperboloid mirror.

Preferably, the detection device is provided with an adjustable aperture.

Preferably, the detector is a single point detector, including PMT, APD or SPAD.

Preferably, the collimating lens is a reflective cup, a refracting lens or a TIR lens.

Preferably, the sight glass of the transmitting device is consistent with the optical axis of the collimator lens, and the sight glass of the receiving device is consistent with the optical axis of the objective lens.

Preferably, the diameter of the objective lens is 200mm.

Preferably, the image sensor is CCD or CMOS.

The beneficial effects of the utility model: provide a long-distance visible light communication transceiver system, by collimating the emitted light, at the same time using the sight glass to roughly adjust the direction of visible light communication, and then using the image sensor to fine-tune, thereby improving the reception Signal-to-noise ratio, reducing communication interference.

Description of drawings

Fig. 1 is a schematic flow chart of an embodiment of the utility model.

Fig. 2 is a schematic diagram of a transmitting device according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of a receiving device according to an embodiment of the present invention.

Detailed ways

The utility model provides ideas for solving the problems raised by the above-mentioned background technology: firstly, the divergence angle of the emitted light of the light source can be compressed by placing the LED light source at the focal point of the optical collimator lens, so that the light energy in the outgoing direction can be more concentrated , and at the same time use the scope to adjust the direction of the light source at the transmitting end so that the receiving end is located in the center of the field of view of the sighting mirror, so that the receiving end is in the outgoing direction of the transmitting end; the second is to use the existing large-caliber telescope to receive light at the receiving end Place the sighting mirror on the receiving device, use this sighting mirror to adjust the receiving direction of the receiving end so that the transmitting end is located in the center of the field of view of the sighting mirror, so as to roughly adjust the receiving direction of the receiving device, and at the same time install an image sensor at the detection device of the receiving device , its function is to fine-tune the receiving direction of the receiving device.

In order to facilitate the understanding of those skilled in the art, the utility model will be further described below in conjunction with the embodiments and drawings, and the content mentioned in the implementation mode is not to limit the utility model.

This embodiment provides a long-distance visible light communication transceiver system, as shown in Figure 2 and Figure 3, including a transmitting device and a receiving device; the transmitting device includes a sight glass 23, an LED light source 21 and a collimating lens 22; the The sight glass 23 is located at the top of the launcher; the LED light source 21 and the collimator lens 22 are located at the inside of the launcher, and the LED light source 21 is located at the focal point of the collimator lens 22; the receiver includes the sight glass 31, the objective lens and detection device; the sighting mirror 31 is located at the top of the receiving device; the objective lens includes a primary mirror and a secondary mirror, and the secondary mirror 32 is located at an end close to the receiving entrance of the receiving device, and the primary mirror 33 is arranged in the receiving device The other end of the device, and the center of the main mirror 33 is provided with a through hole, the through hole is connected with the detection device, and the detection device is provided with an image sensor 34 , a rotatable mirror 35 and a detector 36 .

In this embodiment, as shown in FIG. 1 , the visible light communication transmitting device controls the blinking of the LED light source 21 through an electrical signal to convert the electrical signal into an optical signal, and narrows the divergence angle of the light emitted by the LED light source 21 through the collimator lens 22, so that the emitted light from The emitting device collimates and shoots out, and reaches the receiving device after passing through the visible light channel. At the receiving end, the receiving direction is roughly adjusted through the sight glass 31 of the receiving device, so that the sight glass 31 of the receiving device is aligned with the transmitting device. Received by the image sensor 34 at the detection device, finely adjust the receiving direction so that the sending end is imaged at the center of the image sensor 34, and then adjust the rotatable mirror 35 of the detection device so that the outgoing light from the sending end is received by the detector 36 at the detection device , the transmitted information can be obtained after demodulation by the signal processing system.

In this embodiment, the primary mirror 33 is a parabolic reflector, and the secondary mirror 32 is a hyperboloid reflector. The through hole of the primary mirror 33 and the secondary mirror 32 are on the same straight line, and both have the same diameter. When the collimated incident light enters the receiving device in parallel, the incident light entering the receiving device is projected to the main mirror 33 (parabolic reflector), and is reflected by the main mirror 33 (parabolic reflector), so that the light is reflected on the main mirror 33 (parabolic reflector). ) before focusing, when the light is not fully converged, the light is reflected again by the secondary mirror 32 (hyperboloid reflector) in front of the focus, so that the light passes through the through hole in the center of the main mirror 33 (parabolic reflector) and then focuses, The detector 36 of the detection device at the focal point can receive a stable optical signal, so that the receiving device designed according to the principle of the Cassegrain telescope can greatly reduce the interference of visible light long-distance communication.

In this embodiment, the detection device is provided with an adjustable diaphragm 37, and the range in which the receiving device receives the signals of the transmitting device can be further adjusted through the adjustable diaphragm 37, so that the background light other than the LED light source 21 of the emitting device can be removed, thereby reducing the The effect of background light noise.

In this embodiment, the collimating lens 22 is a reflective cup, a refracting lens or a TIR lens. The reflective cup collimation utilizes the reflection principle of the parabolic reflector. The LED light source 21 is placed at the focal point of the parabolic reflector. The emitted light cannot be irradiated to the reflective cup and exits directly, so that it cannot be collimated. Therefore, this method can only collimate the large-angle outgoing light of the LED light source 21; the refraction lens collimation uses the lens to refract the outgoing light of the light source to achieve the collimation effect , because the refraction lens collimates the small-angle outgoing light of the LED light source 21, its energy utilization rate is higher than that of the reflector cup; the TIR lens is a combination of the reflector cup and the refraction lens, and its energy utilization rate is the highest among the three, but Production costs are also higher. Therefore, the corresponding collimating lens can be selected according to the actual usage.

In this embodiment, the image sensor 34 is a CCD or CMOS; the detector 36 is a single-point detector, including PMT, APD or SPAD.

In this embodiment, the aperture of the objective lens is larger than the aperture of the detection device, and can receive greater light energy through the larger aperture of the objective lens, while eliminating the scintillation effect caused by atmospheric turbulence, wherein the aperture of the objective lens can reach 200 mm.

In this embodiment, the sight glass of the transmitting device is consistent with the optical axis of the collimating lens, and the sight glass of the receiving device is consistent with the optical axis of the objective lens, which facilitates the alignment of the transmitting device and the receiving device.

The above content is only a preferred embodiment of the present utility model. For those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation and scope of application. The content of this specification should not be understood as Limitations on the Invention.

Explanation of terms:

LED: light emitting diode

CCD: Charge Coupled Device

CMOS: Complementary Metal Oxide Semiconductor

PMT: Photomultiplier tube

APD: Avalanche Photodiode

SPAD: Single Photon Detector

TIR: total internal reflection.

Claims (10)

1. a kind of remote visible light communication receive-transmit system, which is characterized in that including emitter and reception device；The transmitting Device includes seeing to take aim at mirror, LED light source and collimation camera lens；The sight takes aim at mirror and is set to emitter top；The LED light source and standard Straight camera lens is set to inside emitter, and LED light source is set to the focal point of collimation camera lens；The reception device includes seeing to take aim at mirror, object Mirror and detection device；The sight takes aim at mirror and is set to reception device top；The object lens include primary mirror and secondary mirror, and the secondary mirror is set to and connects Receiving apparatus is close to one end of receiving port；The reception device other end is set in the primary mirror, and primary mirror center is equipped with through-hole, it is described logical Hole is connect with detection device, and the detection device is equipped with imaging sensor, rotatable reflective mirror and detector.

2. a kind of remote visible light communication receive-transmit system according to claim 1, which is characterized in that the primary mirror leads to On the same line, and the two diameter is identical for hole and secondary mirror.

3. a kind of remote visible light communication receive-transmit system according to claim 1, which is characterized in that the primary mirror is to throw Parabolic mirror.

4. a kind of remote visible light communication receive-transmit system according to claim 1, which is characterized in that the secondary mirror is double Curved reflector.

5. a kind of remote visible light communication receive-transmit system according to claim 1, which is characterized in that the detection device Equipped with adjustable diaphragm.

6. a kind of remote visible light communication receive-transmit system according to claim 1, which is characterized in that the detector is Single point detector, including PMT, APD or SPAD.

7. a kind of remote visible light communication receive-transmit system according to claim 1, which is characterized in that the collimation camera lens For reflector, refractor or TIR lens.

8. a kind of remote visible light communication receive-transmit system according to claim 1, which is characterized in that the emitter Sight take aim at that mirror is consistent with collimation camera lens optical axis, and it is consistent with objective lens optical axis that mirror is taken aim in the sight of the reception device.

9. a kind of remote visible light communication receive-transmit system according to claim 1, which is characterized in that the aperture of objective lens For 200mm.

10. a kind of remote visible light communication receive-transmit system according to claim 1, which is characterized in that described image passes Sensor is CCD or CMOS.