CN104458514A - Rapid measurement method for particle diameter distribution of laser self-mixing-frequency nano particles - Google Patents
Rapid measurement method for particle diameter distribution of laser self-mixing-frequency nano particles Download PDFInfo
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- CN104458514A CN104458514A CN201410734409.6A CN201410734409A CN104458514A CN 104458514 A CN104458514 A CN 104458514A CN 201410734409 A CN201410734409 A CN 201410734409A CN 104458514 A CN104458514 A CN 104458514A
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Abstract
The invention provides a rapid measurement method and device for the particle diameter distribution of laser self-mixing-frequency nano particles. The rapid measurement method comprises the following measurement steps: firstly, directly irradiating divergent beams emitted by a laser diode to the nano particles in a sample tank solution to obtain a self-mixing-frequency signal, wherein the self-mixing-frequency signal comprises particle diameter information of the nano particles; converting the self-mixing-frequency signal to obtain a power spectrum composed of M power with different frequencies; and finally, processing the power spectrum to obtain a particle diameter distribution column vector X of the nano particles. The measurement device comprises a laser device, a sample tank, a trans-impedance amplification circuit and a multi-channel true virtual value conversion circuit. The divergent beams are used for directly irradiating the sample tank so that an optical structure is extremely simplified, and the interferences on the self-mixing-frequency signal by the reflection of an optical device interface are effectively prevented. The multi-channel true virtual value conversion circuit is used for processing the signal; and requirements in the aspects of data acquisition speed, data acquisition amount, data storage amount, data processing amount and the like are reduced, and the rapid measurement can be realized.
Description
Technical field
The present invention relates to nano particle diameter distribution measuring field, be specifically related to method for fast measuring that a kind of laser self-mixing translation nano particle diameter without the need to external optical device distributes and device.
Background technology
In recent years, laser self-mixing translation technology receives much concern in nano particle diameter fields of measurement, is attributed to following advantage:
1, backscatter signal is adopted effectively can to avoid oarse-grained impact, multiple scattering effect etc.
2, adopt self-mixing signal amplification technique, greatly reduce the requirement on detector sensitivity, avoid the impact of stray light and the frequency drift of laser own.
3, measurement mechanism without the need to complex optical path realize light Time and place coherent condition, improve detection sensitivity without the need to correlator and photomultiplier, relative typical measuring arrangements structure is simple, is expected to be applied to On-line sampling system occasion.
Up to now, laser self-mixing translation measuring method and device still need by several optical device by nano particles in Laser Transmission to sample cell.Light feedback is very responsive to external world for laser self-mixing translation, and feedback light comes from the faint rear orientation light of nano particle on the one hand, on the other hand from the reflection of optic interface.In order to reduce the interference of the latter as far as possible, need propose higher requirement to optical device itself and coupling each other, in addition, optical device is high cost that is contaminated, easily damaged, high-quality optical devices itself easily.Above problems limit the widespread use of grain diameter fields of measurement inner laser self-mixing technology.
Summary of the invention
One of the object of the invention is to set up a rapid measurement device without the need to the laser self-mixing translation nano particle diameter of external optical device and method, present invention greatly simplifies measurement mechanism, simple to operate, to measure fast, accurately.
The invention provides a kind of laser self-mixing translation nano particle diameter distribution method for fast measuring, method step is as follows:
S1: the divergent beams sent by laser diode shine directly into the nano particle in sample cell solution, obtains self-mixing signal;
S2: described self-mixing signal is changed, obtains the power spectrum be made up of the power at M different frequency place;
S3: described power spectrum process is obtained described nano particle diameter Distribution of A Sequence vector X.
Step S1 specifically comprises: described nano particle produces rear orientation light after being irradiated by described divergent beams, described rear orientation light return enter described laser diode laserresonator in, produce self-mixing signal with the primary light generation self-mixing in described laserresonator, described self-mixing signal comprises the information of described nano particle diameter.
Step S2 specifically comprises:
Described self-mixing signal, from the injection of laser cavity rear end face, is current signal through photo detector converts;
Described current signal, through changing voltage signal into across resistance amplifying circuit, then walks abreast and sends into hyperchannel true effective value converting circuit, and obtain the signal real effective at M different frequency place;
Described signal real effective is sent in computing machine by the sampling of A/D capture card, obtains the power at M different frequency place, and described power packages success ratio spectrum, can be expressed as:
Wherein, i be frequency channel number (i=1,2 ..., M), M is total number of channels; J be grain diameter stepping number (j=1,2 ..., N), N is grain diameter stepping sum; x
jjth shelves grain diameter mean value; △ x
jit is the stepping width of jth shelves particle diameter; Q is the value of Scattering of Vector; D
jbe the particle diffusivity of jth shelves particle diameter, contain nano particle diameter x
jinformation; Integration variable ω is the angular frequency relevant with Brownian movement; H
i(ω
0, i, ω) and be the frequency response function of the i-th channel bandpass filter, the centre frequency of this channel bandpass filter is ω
0, i, be applicable to the passive and active filter in each rank; ρ (x
j) be the distribution of particles function of jth shelves particle diameter.
Step S3 specifically comprises:
First described formula (1) is transformed into matrix, obtains:
S∝KX
Wherein, Power Spectrum Distribution column vector S is one group of measuring amount, and obtained across resistance amplifying circuit and the process of described hyperchannel true effective value converting circuit through described by described self-mixing signal, matrix of coefficients K is according in described formula (1)
Calculate;
Then solution matrix equation S ∝ KX, obtains described nano particle diameter Distribution of A Sequence vector X.
A kind of laser self-mixing translation nano particle diameter distribution rapid measurement device, comprise laser instrument, sample cell, across resistance amplifying circuit and hyperchannel true effective value converting circuit, described laser instrument comprises laser diode and is placed in photoelectric detector thereafter, described hyperchannel true effective value converting circuit is M routing cache device, the circuit that the bandpass filter of different center frequency and RMS conversion device are in series, nano particle in the divergent beams direct irradiation sample cell that described laser diode sends, produce self-mixing signal and received by photoelectric detector, the signal that described photoelectric detector exports is after trans-impedance amplifier amplifies, the described hyperchannel true effective value converting circuit of parallel feeding, obtain the signal real effective at M different frequency place, sampled by A/D capture card, finally obtain the power spectrum of signal.
Described laser instrument is close to described sample cell, the nano particle in the divergent beams direct irradiation sample cell that described laser diode sends; Particle rear orientation light returns and enters in laser diode resonator cavity, and with primary light generation self-mixing in chamber, a part of self-mixing signal penetrates from laserresonator rear end face.
Beneficial effect of the present invention is, uses a kind of laser self-mixing translation nano particle diameter distribution method for fast measuring provided by the invention and device, realizes laser self-mixing translation nano particle diameter distribution measuring, greatly simplifie optical texture without the need to external optical device.Adopt hyperchannel true effective value converting circuit processing signals, reduce the requirement to aspects such as acquisition speed, data acquisition amount, amount of data storage and data processing amounts, greatly shorten data processing time, can Quick Measurement be realized.
Accompanying drawing explanation
Fig. 1 is the principle schematic of measurement mechanism of the present invention and method
Fig. 2 is the distribution plan of the matrix of coefficients K of measurement mechanism of the present invention.
Embodiment
Hereafter will describe embodiments of the invention in detail by reference to the accompanying drawings.It should be noted that the combination of technical characteristic or the technical characteristic described in following embodiment should not be considered to isolated, they can mutually be combined thus be reached better technique effect.In the accompanying drawing of following embodiment, the identical label that each accompanying drawing occurs represents identical feature or parts, can be applicable in different embodiment.
The invention provides a kind of laser self-mixing translation nano particle diameter distribution method for fast measuring as shown in Figure 1, method step is as follows:
S1: shone directly into by the divergent beams that laser diode 2 sends on the nano particle in sample cell 3, obtains self-mixing signal;
S2: described self-mixing signal is changed, obtains the power spectrum be made up of the power at M different frequency place;
S3: described power spectrum process is obtained described nano particle diameter Distribution of A Sequence vector X.
Step S1 specifically comprises: described nano particle produces rear orientation light after being irradiated by described divergent beams, described rear orientation light return enter described laser diode 2 laserresonator in, produce self-mixing signal with the primary light generation self-mixing in described laserresonator, described self-mixing signal comprises the information of described nano particle diameter.
Step S2 specifically comprises:
Described self-mixing signal, from the injection of laser diode 2 rear end face, changes current signal into through photoelectric detector 4;
Described current signal, through changing voltage signal into across resistance amplifying circuit 5, then walks abreast and sends into hyperchannel true effective value converting circuit 6, and obtain the signal real effective at M different frequency place;
Described signal real effective is sent in computing machine 10 by the sampling of A/D capture card, obtains the power at M different frequency place, and described power packages success ratio spectrum, can be expressed as:
Wherein, i be frequency channel number (i=1,2 ..., M), M is total number of channels; J be grain diameter stepping number (j=1,2 ..., N), N is grain diameter stepping sum; x
jjth shelves grain diameter mean value; △ x
jit is the stepping width of jth shelves particle diameter; Q is the value of Scattering of Vector; D
jbe the particle diffusivity of jth shelves particle diameter, contain nano particle diameter x
jinformation; Integration variable ω is the angular frequency relevant with Brownian movement; H
i(ω
0, i, ω) and be the frequency response function of the i-th channel bandpass filter, the centre frequency of this channel bandpass filter is ω
0, i, be applicable to the passive and active filter in each rank; ρ (x
j) be the distribution of particles function of jth shelves particle diameter.
Step S3 specifically comprises:
First described formula (1) is transformed into matrix, obtains:
S∝KX
Wherein, Power Spectrum Distribution column vector S is one group of measuring amount, and obtained across resistance amplifying circuit and the process of described hyperchannel true effective value converting circuit through described by described self-mixing signal, matrix of coefficients K is according in described formula (1)
Calculate, as shown in Figure 2;
Then solution matrix equation S ∝ KX, obtains described nano particle diameter Distribution of A Sequence vector X.
A kind of laser self-mixing translation nano particle diameter distribution rapid measurement device, comprise laser instrument 1, sample cell 3, across resistance amplifying circuit 5 and hyperchannel true effective value converting circuit 6, the photoelectric detector 4 that described laser instrument 1 comprises laser diode 2 and is placed in thereafter, described hyperchannel true effective value converting circuit is M routing cache device 7, the circuit that the bandpass filter 8 of different center frequency and RMS conversion device 9 are in series, nano particle in the divergent beams direct irradiation sample cell 3 that described laser diode 2 sends, produce self-mixing signal and received by photoelectric detector 4, the signal that described photoelectric detector 4 exports is after amplifying across resistance amplifying circuit 5, the described hyperchannel true effective value converting circuit 6 of parallel feeding, obtain the signal real effective at M different frequency place, sampled into computing machine 10 by A/D capture card, finally obtain the power spectrum of signal.
Described laser instrument 1 is close to described sample cell 3, the nano particle in the divergent beams direct irradiation sample cell 3 that described laser diode 2 sends; Particle rear orientation light returns and enters in laser diode 2 resonator cavity, and with primary light generation self-mixing in chamber, a part of self-mixing signal penetrates from laserresonator rear end face.
Embodiment 1:
As shown in Figure 1, the divergent beams that in laser instrument 1, laser diode 2 sends shine directly on the particle in sample cell 3.The rear orientation light of particle return enter laser diode 2 resonator cavity in, export with primary light generation self-mixing modulated laser in chamber, a part exports light and is converted into voltage signal by photoelectric detector 4, after amplifying across resistance amplifying circuit 5, the circuit that the bandpass filter 8 of parallel feeding M routing cache device 7, different center frequency and RMS conversion device 9 are in series, obtain the signal real effective at M different frequency place, sent into computing machine 10 by the sampling of A/D capture card, finally obtain the power spectrum of signal.
Use a kind of laser self-mixing translation nano particle diameter distribution method for fast measuring provided by the invention and device, laser self-mixing translation nano particle diameter distribution measuring is realized without the need to external optical device, greatly simplifie optical texture, effectively prevent the reflection of optic interface to the interference of self-mixing signal.Adopt hyperchannel true effective value converting circuit processing signals, reduce the requirement to aspects such as acquisition speed, data acquisition amount, amount of data storage and data processing amounts, greatly shorten data processing time, can Quick Measurement be realized.
Although give some embodiments of the present invention, it will be understood by those of skill in the art that without departing from the spirit of the invention herein, can change embodiment herein.Above-described embodiment is exemplary, should using embodiment herein as the restriction of interest field of the present invention.
Claims (6)
1. a laser self-mixing translation nano particle diameter distribution method for fast measuring, it is characterized in that, method step is as follows:
S1: the divergent beams sent by laser diode shine directly into the nano particle in sample cell, obtains self-mixing signal;
S2: described self-mixing signal is changed, obtains the power spectrum be made up of M different frequency place power;
S3: described power spectrum process is obtained described nano particle diameter Distribution of A Sequence vector X.
2. a kind of laser self-mixing translation nano particle diameter distribution method for fast measuring as claimed in claim 1, it is characterized in that, step S1 specifically comprises: described nano particle produces rear orientation light after being irradiated by described divergent beams, described rear orientation light return enter described laser diode laserresonator in, produce self-mixing signal with the primary light generation self-mixing in described laserresonator, described self-mixing signal comprises the information of described nano particle diameter.
3. a kind of laser self-mixing translation nano particle diameter distribution method for fast measuring as claimed in claim 1, it is characterized in that, step S2 specifically comprises:
Described self-mixing signal, from the injection of laser cavity rear end face, is current signal through photo detector converts;
Described current signal, through changing voltage signal into across resistance amplifying circuit, then walks abreast and sends into hyperchannel true effective value converting circuit, and obtain the signal real effective at M different frequency place;
Described signal real effective is sent in computing machine by the sampling of A/D capture card, obtains the power at M different frequency place, and described power packages success ratio spectrum, can be expressed as:
Wherein, i be frequency channel number (i=1,2 ..., M), M is total number of channels; J be grain diameter stepping number (j=1,2 ..., N), N is grain diameter stepping sum; x
jjth shelves grain diameter mean value; Δ x
jit is the stepping width of jth shelves particle diameter; Q is the value of Scattering of Vector; D
jbe the particle diffusivity of jth shelves particle diameter, contain nano particle diameter x
jinformation; Integration variable ω is the angular frequency relevant with Brownian movement; H
i(ω
0, i, ω) and be the frequency response function of the i-th channel bandpass filter, the centre frequency of this channel bandpass filter is ω
0, i, be applicable to the passive and active filter in each rank; ρ (x
j) be the distribution of particles function of jth shelves particle diameter.
4. a kind of laser self-mixing translation nano particle diameter distribution method for fast measuring as described in claim 1 or 3, it is characterized in that, step S3 specifically comprises:
First described formula (1) is transformed into matrix, obtains:
S∝KX
Wherein, Power Spectrum Distribution column vector S is one group of measuring amount, and obtained across resistance amplifying circuit and the process of described hyperchannel true effective value converting circuit through described by described self-mixing signal, matrix of coefficients K is according in described formula (1)
Calculate;
Then solution matrix equation S ∝ KX, obtains described nano particle diameter Distribution of A Sequence vector X.
5. a laser self-mixing translation nano particle diameter distribution rapid measurement device, it is characterized in that, this device comprises laser instrument, sample cell, across resistance amplifying circuit and hyperchannel true effective value converting circuit, described laser instrument comprises laser diode and is placed in photoelectric detector thereafter, described hyperchannel true effective value converting circuit is M routing cache device, the circuit that the bandpass filter of different center frequency and RMS conversion device are in series, nano particle in the divergent beams direct irradiation sample cell that described laser diode sends, produce self-mixing signal and received by photoelectric detector, the signal that described photoelectric detector exports is after amplifying across resistance amplifying circuit, the described hyperchannel true effective value converting circuit of parallel feeding, obtain the signal real effective at M different frequency place, sampled by A/D capture card, finally obtain the power spectrum of signal.
6. a kind of laser self-mixing translation nano particle diameter distribution rapid measurement device as claimed in claim 5, it is characterized in that, described laser instrument is close to described sample cell, the nano particle in the divergent beams direct irradiation sample cell that described laser diode sends; Particle rear orientation light returns and enters in laser diode resonator cavity, and with primary light generation self-mixing in chamber, a part of self-mixing signal penetrates from laserresonator rear end face.
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| WO2017162677A1 (en) * | 2016-03-21 | 2017-09-28 | Koninklijke Philips N.V. | Laser sensor for ultra-fine particle size detection |
| JP2018523106A (en) * | 2015-07-30 | 2018-08-16 | コーニンクレッカ フィリップス エヌ ヴェＫｏｎｉｎｋｌｉｊｋｅ Ｐｈｉｌｉｐｓ Ｎ．Ｖ． | Laser sensor for particle size detection |
| CN110793894A (en) * | 2018-08-03 | 2020-02-14 | 帕拉贡有限股份两合公司 | Particle measuring device and method for determining the mass concentration of particles in an aerosol |
| CN111239079A (en) * | 2020-03-09 | 2020-06-05 | 上海交通大学 | Time-varying turbid field simulation device with fixed optical depth |
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| CN102297823A (en) * | 2011-05-17 | 2011-12-28 | 上海理工大学 | Method and apparatus for measuring dynamic light scattering nano-particles based on bandpass filtering |
| CN102564909A (en) * | 2011-11-29 | 2012-07-11 | 中国科学院安徽光学精密机械研究所 | Laser self-mixing multi-physical parameter measurement method and device for atmospheric particulate |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102297823A (en) * | 2011-05-17 | 2011-12-28 | 上海理工大学 | Method and apparatus for measuring dynamic light scattering nano-particles based on bandpass filtering |
| CN102564909A (en) * | 2011-11-29 | 2012-07-11 | 中国科学院安徽光学精密机械研究所 | Laser self-mixing multi-physical parameter measurement method and device for atmospheric particulate |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018523106A (en) * | 2015-07-30 | 2018-08-16 | コーニンクレッカ フィリップス エヌ ヴェＫｏｎｉｎｋｌｉｊｋｅ Ｐｈｉｌｉｐｓ Ｎ．Ｖ． | Laser sensor for particle size detection |
| WO2017162677A1 (en) * | 2016-03-21 | 2017-09-28 | Koninklijke Philips N.V. | Laser sensor for ultra-fine particle size detection |
| CN108780030A (en) * | 2016-03-21 | 2018-11-09 | 皇家飞利浦有限公司 | Laser sensor for ultra-fine particle sizes detection |
| JP2019516074A (en) * | 2016-03-21 | 2019-06-13 | コーニンクレッカ フィリップス エヌ ヴェＫｏｎｉｎｋｌｉｊｋｅ Ｐｈｉｌｉｐｓ Ｎ．Ｖ． | Laser sensor for ultrafine particle size detection |
| US11119021B2 (en) | 2016-03-21 | 2021-09-14 | Trumpf Photonic Components Gmbh | Laser sensor for ultra-fine particle size detection |
| CN110793894A (en) * | 2018-08-03 | 2020-02-14 | 帕拉贡有限股份两合公司 | Particle measuring device and method for determining the mass concentration of particles in an aerosol |
| CN111239079A (en) * | 2020-03-09 | 2020-06-05 | 上海交通大学 | Time-varying turbid field simulation device with fixed optical depth |
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