CN104297207B - A kind of laser breath analyzing instrument and system based on TDLAS - Google Patents
A kind of laser breath analyzing instrument and system based on TDLAS Download PDFInfo
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- CN104297207B CN104297207B CN201410566456.4A CN201410566456A CN104297207B CN 104297207 B CN104297207 B CN 104297207B CN 201410566456 A CN201410566456 A CN 201410566456A CN 104297207 B CN104297207 B CN 104297207B
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Abstract
The invention provides a kind of laser breath analyzing instrument and system based on TDLAS, the laser breath analyzing instrument includes semiconductor laser with tunable, gas absorption vessel, laser pick-off unit, processing and control element (PCE), the gas absorption vessel is provided with air admission hole and venthole, the laser that the semiconductor laser with tunable is sent is received after the gas absorption vessel by the laser pick-off unit, the laser pick-off unit is connected with the processing and control element (PCE), the laser pick-off unit is used to the optical signal received being converted to electric signal and by the electric signal transmission to the processing and control element (PCE), the processing and control element (PCE) analyzes gas concentration according to the electric signal received.The beneficial effects of the invention are as follows：The accuracy of detection of the present invention is high, and speed is fast；Good portability, small volume, chargeable, energy band are anywhere detected；It can be connected with mobile phone by software and understand situation in real time, and can saved historical data.
Description
Technical field
The present invention relates to field of medical device, more particularly to a kind of laser breath analyzing instrument and system based on TDLAS.
Background technology
With the progress in epoch, scientific and technical invention, medical diagnosis level is also improving constantly, at present by measuring people
The concentration of the gas such as CO, CO2,12CO2/13CO2, NO, N2O, H2O, NH3, C2H6, is realized to human body intestines in body exhaled gas
The quick diagnosis of the organs such as stomach, liver, lung, respiratory tract, blood and tissue.
The method of detection characteristics of contaminated respiratory droplets gas has at present：
1. spectra methods：It is to pass through light using after absorption of the measured matter to specific wavelength light source, transmitting, scattering process
The method of spectrum analysis measure gas concentration, light source include ultraviolet, visible ray, infrared ray, microwave, radioactive wave etc..Wherein 1）It is purple
Outside-visible absorption spectroscopy：Using launch wavelength in 200-400nm ultraviolet source, or launch wavelength is 400-800nm's
Visible light source；2）Infrared absorption spectroscopy：Infrared light supply includes NDIR between 800nm-1000 μm, using technology（It is non-spectral
Infrared gas analysis）, FTIR（Fourier transform infrared spectroscopy）.
2. electricity analysis method：It is to cause after physics chemical action occurs with measured matter using various gas-sensitivity and electric sensors
The method for the measurement gas concentration that the electrical parameters such as electric current, voltage, resistance change, sensor generally comprise semi-conductor gas biography
Sensor, electrolyte gas sensor etc..
The shortcomings that above-mentioned technology, is as follows：
1. UV-Vis Spectrophotometry：The gaseous species that can be detected in this wave-length coverage are very limited, and inhale
Receipts intensity is not high, and accuracy of detection is limited, unsuitable to require high-precision breath analysis.
2. infrared absorption spectroscopy：Infrared light supply wave-length coverage is wider, and nearly all gas has suction in this scope
Receive, and technology used by most of gas analysis instrument, but because the spectrum line of infrared light supply is roomy at present, generally higher than
The absorption line width of specific gas, cause to absorb cross jamming, it is impossible to the absorption of the true tested gas of reflection.NDIR technologies,
Using common infrared light supply and the method directly absorbed, to the poor selectivity of specific gas, the meeting when calculating tested gas and absorbing
Disturbed by the absorption of other gases, application condition is big；FTIR technologies, complex designing, volume is big, and has moving component, to ring
Border vibration sensing.
3. electricity analysis method：Shortcoming 1）Electrochemical sensing device has a fixed exposure limit of power, in the range of this
Detection performance is reliable, and the use more than detection range can influence its accuracy；2）Tested gas cross influences, because electricity
Sensor typically using redox reaction produce electric current principle, this course of reaction be to many gases it is very common, this
Cross jamming is just generated, influences the actual content of detected gas；3）Response speed is slow, and analysis is time-consuming, cumbersome；4）It is long
Phase stability is poor, short life（2 years or so）, easily failure.
The content of the invention
In order to solve the problems of the prior art, the invention provides a kind of laser breath analyzing instrument based on TDLAS.
The invention provides a kind of laser breath analyzing instrument based on TDLAS, including semiconductor laser with tunable, gas
Absorb container, laser pick-off unit, processing and control element (PCE), the gas absorption vessel is provided with air admission hole and venthole, it is described can
The laser that tunable semiconductor laserses are sent is received after the gas absorption vessel by the laser pick-off unit, described to swash
Light receiving unit is connected with the processing and control element (PCE), and the laser pick-off unit is used to the optical signal received being converted to electricity
Signal simultaneously gives the electric signal transmission to the processing and control element (PCE), and the processing and control element (PCE) is analyzed according to the electric signal received
Gas concentration.
As a further improvement on the present invention, the processing and control element (PCE) is connected with the semiconductor laser with tunable,
The processing and control element (PCE) is used to control the semiconductor laser with tunable to be operated.
As a further improvement on the present invention, the laser breath analyzing instrument also includes current control module, the processing control
Unit processed is connected with the current control module input, and the current control module output end swashs with the tunable semiconductor
Light device is connected.
As a further improvement on the present invention, the laser pick-off unit includes photodetector, the photodetector
For the optical signal received to be converted into electric signal, the photodetector is connected with the processing and control element (PCE).
As a further improvement on the present invention, the laser pick-off unit also includes lock phase amplification module, and the photoelectricity is visited
Survey device output end with the lock phase amplification module input to be connected, the lock phase amplification module output end and the processing control are single
Member is connected.
As a further improvement on the present invention, the laser pick-off unit also includes pre-amplifying module, bandpass filtering mould
Block, the photodetector output end are connected with the pre-amplifying module input, the pre-amplifying module output end with
The bandpass filtering modules block input is connected, the bandpass filtering modules block output end and the lock phase amplification module input phase
Even.
As a further improvement on the present invention, the laser breath analyzing instrument also includes temperature control modules, the temperature control
Molding block is connected with the semiconductor laser with tunable.
As a further improvement on the present invention, the laser breath analyzing instrument also include adder and with the adder
Triangular wave generator module that input is respectively connected with, dC quantity generation module, high-frequency cosine modulation intelligence module, the adder
Output end is connected with the semiconductor laser with tunable.
As a further improvement on the present invention, the processing and control element (PCE) include analog-to-digital conversion module and with the mould
The connected analysis module of number modular converters, the analog-to-digital conversion module be used for by the module by signal of input be converted to data signal,
And input the data signal to the analysis module, the analysis module is used to calculate gas concentration.
The invention also discloses a kind of system for including the laser breath analyzing instrument, the system also includes terminal device,
The processing and control element (PCE) is by whetheing there is or wireless mode is by gas concentration data transfer to terminal device.
The beneficial effects of the invention are as follows：The accuracy of detection of the present invention is high, and speed is fast；Good portability, small volume, it is chargeable,
Energy band is anywhere detected；It can be connected with mobile phone by software and understand situation in real time, and can saved historical data.
Brief description of the drawings
Fig. 1 is the theory diagram of the present invention.
Fig. 2 is first embodiment schematic diagram of the present invention.
Fig. 3 is second embodiment schematic diagram of the present invention.
Fig. 4 is the 3rd embodiment schematic diagram of the present invention.
Embodiment
As shown in figure 1, the invention discloses a kind of laser breath analyzing instrument based on TDLAS, including tunable semiconductor
Laser 1, gas absorption vessel 2, laser pick-off unit 3, processing and control element (PCE) 4, the gas absorption vessel 2 are provided with air admission hole
And venthole, the laser that the semiconductor laser with tunable 1 is sent are connect after the gas absorption vessel 2 by the laser
Receive unit 3 to receive, the laser pick-off unit 3 is connected with the processing and control element (PCE) 1, and the laser pick-off unit 3 is used for will
The optical signal received is converted to electric signal and by the electric signal transmission to the processing and control element (PCE) 4, the processing control list
Member 4 is according to the electric signal analysis gas concentration received.
Full used time, user are blown into gas into gas absorption vessel 2, and it is dense to analyze gas by the laser breath analyzing instrument
Degree.
The processing and control element (PCE) 4 is connected with the semiconductor laser with tunable 1, and the processing and control element (PCE) 4 is used for
The semiconductor laser with tunable 1 is controlled to be operated.
As shown in Fig. 2 one embodiment as the present invention, the laser breath analyzing instrument also include current control module
5, the processing and control element (PCE) 4 is connected with the input of current control module 5, the output end of current control module 5 and institute
Semiconductor laser with tunable 1 is stated to be connected.
The laser pick-off unit 3 includes photodetector 31, and the photodetector 31 is used to believe the light received
Number electric signal is converted to, the photodetector 31 is connected with the processing and control element (PCE) 4.
As shown in figure 3, second embodiment as the present invention, the laser pick-off unit 3 also includes lock and mutually amplifies mould
Block 32, the output end of photodetector 31 are connected with the input of lock phase amplification module 32, the lock phase amplification module 32
Output end is connected with the processing and control element (PCE) 4.
As shown in figure 4, the 3rd embodiment as the present invention, the laser pick-off unit 3 also include preposition amplification mould
Block 33, bandpass filtering modules block 34, the output end of photodetector 31 is connected with the input of pre-amplifying module 33, described
The output end of pre-amplifying module 33 is connected with the input of bandpass filtering modules block 34, the output end of bandpass filtering modules block 34 with
The input of lock phase amplification module 32 is connected.
The laser breath analyzing instrument also includes temperature control modules 6, and the temperature control modules 6 tunable are partly led with described
Body laser 1 is connected.
The laser breath analyzing instrument also includes adder 7 and the triangular wave being respectively connected with the input of adder 7
Generation module 8, dC quantity generation module 9, high-frequency cosine modulation intelligence module 10, the output end of adder 7 with it is described adjustable
Humorous semiconductor laser 1 is connected.
Point that the processing and control element (PCE) 4 includes analog-to-digital conversion module 41 and is connected with the analog-to-digital conversion module 41
Module 42 is analysed, the analog-to-digital conversion module 41 is used to the module by signal of input being converted to data signal and by the data signal
To the analysis module 42, the analysis module 42 is used to calculate gas concentration for input.
In analysis module 42, first harmonic average and maximum are obtained, so as to calculate gas concentration.
The processing and control element (PCE) 4 also includes the output display module being connected with analysis module 42, and the output display module is used
In gas concentration data are shown into user.
The analog-to-digital conversion module 41 can be inside processing and control element (PCE) 4, and the analog-to-digital conversion module 41 can also be independent
Module, or the analog-to-digital conversion module 41 can also be located at laser pick-off unit 3 inside.
In the present invention, TDLAS：It is Tunable Diode Laser Absorption Spectroscopy abbreviation,
Translator of Chinese：Tunable diode laser absorption spectroscopy, it is with electric current and the tested gas of thermal tuning laser output wavelength scanning
The a certain bar absorption line of body, the absorption intensity by detecting absorption spectrum obtain the concentration of gas.Using " single line absorbs light
Spectrum " e measurement technology, can avoid gas cross from disturbing, be a kind of high-resolution spectral absorption technology completely.
In the present invention, using the light source different from routine, you can tuning laser light source（As DFB semiconductor laser,
ICL lasers, QCL lasers etc.）, this kind of light source has narrow linewidth（Line width is less than gas absorption spectrum line width, belongs to single line suction
Receive, disturbed in the absence of absorbing）, tunable wave length（Meet TDLAS second harmonic algorithm）；Using the inspection different from conventional lighting sources
Survey technology, using TDLAS technologies, routine techniques typically uses direct absorption process, and directly absorbing is recorded by function of wavelength
Prototype Absorption Line of the gas to absorbing incident light is tested, and TDLAS technologies are to pass through to be tested gas using laser wavelength modulation
Characteristic absorption area, be it is a kind of new, have high sensitivity, high-resolution, the gas detection technology of quick detection feature.
The gas absorption vessel 2 of the present invention absorbs light path, Herriott using Herriott absorption cells increase gas（He Li
Ao Te）It is a kind of gas absorption cell of how anti-chamber long light path, is mainly made up of two pieces of ball-type minute surfaces and pond body, is provided with long light
Journey, miniaturization, easy to operate, high stability etc. are special, and the TDLAS laser breath analyzing instruments based on the technique construction have highly sensitive
The advantages that degree, high accuracy, fast reaction.
The invention also discloses a kind of system for including the laser breath analyzing instrument, the system also includes terminal device,
The processing and control element (PCE) 4 is by whetheing there is or wireless mode is by gas concentration data transfer to terminal device.The terminal device can
To be smart mobile phone, the API abilities that interconnect and open by smart mobile phone APP, realize that " hard+soft+service " is organically combined one
Rise, user can be allowed to understand the health status of oneself in real time, and can be exchanged by social platform and share personal information.
The present invention has following technical advantage：Accuracy of detection is high, and speed is fast；Good portability, small volume, chargeable, energy band
Anywhere detected；It can be connected with mobile phone by software and understand situation in real time, and can saved historical data.
Prior art general measure precision is low, typically only ppm, and the response time is slow；But the present invention employs new technology, measurement
Precision is high, reaches the ppb orders of magnitude, fast response time, gas concentration can be measured in 1 second, makes diagnosis.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to is assert
The specific implementation of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
On the premise of not departing from present inventive concept, some simple deduction or replace can also be made, should all be considered as belonging to the present invention's
Protection domain.
Claims (4)
- A kind of 1. laser breath analyzing instrument based on TDLAS, it is characterised in that：Inhaled including semiconductor laser with tunable, gas Receptacle, laser pick-off unit, processing and control element (PCE), the gas absorption vessel is provided with air admission hole and venthole, described adjustable The laser that humorous semiconductor laser is sent is received after the gas absorption vessel by the laser pick-off unit, the laser Receiving unit is connected with the processing and control element (PCE), and the laser pick-off unit is used to the optical signal received being converted to telecommunications Number and give the electric signal transmission to the processing and control element (PCE), the processing and control element (PCE) analyzes gas according to the electric signal received Bulk concentration；The triangular wave that the laser breath analyzing instrument also includes adder and is respectively connected with the adder input is sent out Raw module, dC quantity generation module, high-frequency cosine modulation intelligence module, the adder output and the tunable semiconductor Laser is connected；The processing and control element (PCE) is connected with the semiconductor laser with tunable, and the processing and control element (PCE) is described for controlling Semiconductor laser with tunable is operated；The laser breath analyzing instrument also includes current control module, and the processing and control element (PCE) inputs with the current control module End is connected, and the current control module output end is connected with the semiconductor laser with tunable；The semiconductor laser with tunable includes DFB semiconductor laser, ICL lasers, QCL lasers；The laser pick-off unit includes photodetector, and the photodetector is used to the optical signal received being converted to electricity Signal, the photodetector are connected with the processing and control element (PCE)；The laser pick-off unit also includes lock phase amplification module, the photodetector output end and the lock phase amplification module Input is connected, and the lock phase amplification module output end is connected with the processing and control element (PCE)；The laser pick-off unit also includes pre-amplifying module, bandpass filtering modules block, the photodetector output end and institute Pre-amplifying module input to be stated to be connected, the pre-amplifying module output end is connected with the bandpass filtering modules block input, The bandpass filtering modules block output end is connected with the lock phase amplification module input.
- 2. laser breath analyzing instrument according to claim 1, it is characterised in that：The laser breath analyzing instrument also includes temperature Control module, the temperature control modules are connected with the semiconductor laser with tunable.
- 3. according to the laser breath analyzing instrument described in any one of claim 1 to 2, it is characterised in that：The processing and control element (PCE) The analysis module being connected including analog-to-digital conversion module and with the analog-to-digital conversion module, the analog-to-digital conversion module is used for will The module by signal of input is converted to data signal and inputs the data signal to the analysis module, the analysis module and uses In calculating gas concentration.
- A kind of 4. system for including any one of claims 1 to 3 laser breath analyzing instrument, it is characterised in that：The system is also Including terminal device, the processing and control element (PCE) is by whetheing there is or wireless mode is by gas concentration data transfer to terminal device； The gas absorption vessel is Maurice Herriott absorption cell.
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| CN105548017A (en) * | 2015-12-30 | 2016-05-04 | 北方华锦化学工业集团有限公司 | Non-contact type semiconductor laser gas analyzer |
| CN106053376A (en) * | 2016-08-16 | 2016-10-26 | 北京千安哲信息技术有限公司 | Gas pollutant detection device |
| CN106990071A (en) * | 2017-05-15 | 2017-07-28 | 东南大学 | A kind of full digital gas detecting instrument |
| CN107991210A (en) * | 2017-11-24 | 2018-05-04 | 深圳市昂茂科技有限公司 | Sensor |
| CN107713102A (en) * | 2017-11-24 | 2018-02-23 | 深圳市昂茂科技有限公司 | Mouth mask |
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| CN201237572Y (en) * | 2008-04-30 | 2009-05-13 | 宁波工程学院 | Optical detector for ethyne gas |
| JP5527278B2 (en) * | 2011-05-11 | 2014-06-18 | 株式会社島津製作所 | Gas analyzer |
| CN203732439U (en) * | 2013-10-31 | 2014-07-23 | 浙江师范大学 | Correcting device for gas concentration measurement based on wavelength modulation technique |
| CN103604774B (en) * | 2013-12-05 | 2016-08-17 | 天津大学 | The method and apparatus improving laser gas analysis sensitivity based on non-linear tuning |
| CN203658253U (en) * | 2013-12-18 | 2014-06-18 | 天津科技大学 | Ethylene detecting device for microenvironment of carriage based on TDLAS (Tunable Diode Laser Absorption Spectroscopy) technology |
| CN103728270B (en) * | 2013-12-29 | 2017-10-03 | 西藏民族学院 | A kind of semiconductor laser modulated spectrum multicomponent gas detection method and device |
| CN103868884B (en) * | 2014-03-27 | 2016-06-15 | 清华大学 | A kind of GAS ABSORPTION rate On-line Measuring Method based on the index of modulation |
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