CN107677639A - A kind of method of laser detection formaldehyde gas - Google Patents
A kind of method of laser detection formaldehyde gas Download PDFInfo
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- CN107677639A CN107677639A CN201710881754.6A CN201710881754A CN107677639A CN 107677639 A CN107677639 A CN 107677639A CN 201710881754 A CN201710881754 A CN 201710881754A CN 107677639 A CN107677639 A CN 107677639A
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- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
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Abstract
The invention discloses a kind of method of laser detection formaldehyde gas, its step are as follows:Step 1, drive signal is adjusted, frequency modulation semiconductor laser, ensures that modulation optical maser wavelength is fixed on the specific wavelength spectral line of tested gas characteristic spectrum；Step 2, background gas are passed through, ensure to be full of background gas in laser detector；Step 3, modulation laser is made then to be received after reflecting plate by photo-detector by background gas, background electric signal is obtained after output；Step 4, under test gas is passed through in laser detector, after modulated laser detection, photo-detector exports sample electrical signal after receiving；Step 5, glitch-free detection signal will be obtained after sample electrical signal and background Electric signal processing.The present invention uses the sensing mode of two sub-beams, solve light beam flashing is fixed and influence that the drift of photoelectric device is to signal, ensure that detection signal is relevant by the concentration only with gas with the ratio of reference signal, accurate measurement can be achieved.
Description
Technical field
The invention belongs to technical field of laser detection, and in particular to a kind of method of laser detection formaldehyde gas.
Background technology
With making rapid progress for development in science and technology, some producers are inevitable in order to enhance product performance, reduce production cost
Add the raw material containing harmful substances such as formaldehyde in process of production, this also makes Wood-based Panel Furniture, house decorative material, building
The content of formaldehyde showed increased that essential basic part is discharged in the indoor environments such as material.However, indoor formaldehyde
The exceeded of content can lure that human body produces a variety of diseases into, such as：Pulmonary edema, hepatic coma, kidney failure etc., the World Health Organization also confirms
Formaldehyde is teratogenesis, carcinogen, is allergen, Long Term Contact will cause gene mutation.Therefore, found according to specific environment
A kind of appropriate method determines content of formaldehyde in room air to avoiding harm of the formaldehyde to human body most important exactly.
The physics of formaldehyde, chemical property are very active, due to formaldehyde HCHO and hydrone H2O each other can be with hydrogen bond
Form firmly connect, therefore formaldehyde can be dissolved each other with water with arbitrary proportion；Meanwhile formaldehyde also can well be dissolved in part and have
In solvent.Formaldehyde easily chemically reacts with many kinds of substance (such as oxygen), and the material such as generation acid, ketone, formaldehyde has certain
Oxidisability and reproducibility.Therefore, the formaldehyde in a variety of quantitative analysis methods measure room air can be used.At present, first is determined
The method of aldehyde is a lot, mainly there is AAS, chromatography, electrochemical methods and instrument detection method etc., and electrochemical analysis
Method is commonly present the problems such as interference is more, unstable, so making to be used less.And AAS and chromatography are relatively complicated, and set
It is standby more huge, it is difficult to meet the needs of current quick detection.
The content of the invention
The purpose of the present invention is in view of the deficiencies of the prior art, there is provided a kind of method of laser detection formaldehyde gas,
Using the sensing mode of two sub-beams, solve light beam flashing is fixed and influence that the drift of photoelectric device is to signal, protect
It is with the ratio of reference signal that the concentration only with gas is relevant to demonstrate,prove detection signal, accurate measurement can be achieved.
In order to solve the above-mentioned technical problem, technical scheme is as follows：
A kind of method of laser detection formaldehyde gas, its step are as follows:
Step 1, drive signal is adjusted, frequency modulation semiconductor laser, it is special to ensure that modulation optical maser wavelength is fixed on tested gas
Levy on the specific wavelength spectral line of spectrum；
Step 2, background gas are passed through, ensure to be full of background gas in laser detector；
Step 3, modulation laser is made then to be received by photo-detector after reflecting plate, be obtained after output by background gas
Background electric signal；
Step 4, under test gas is passed through in laser detector, after modulated laser detection, photo-detector exports after receiving
Sample electrical signal；
Step 5, glitch-free detection signal will be obtained after sample electrical signal and background Electric signal processing.
Characteristic spectrum in the step 1 is 360nm spectral lines.
Background gas in the step 2 use air.
Reflecting plate in the step 3 be arranged in parallel with semiconductor laser, reaches the purpose that former circuit returns.
The spacing of reflecting plate and semiconductor laser in the step 3 is 2-10mm.
Under test gas in the step 4 is indoor formaldehyde air to be detected.
The processing method of background electric signal and sample electrical signal in the step 5 is as follows：
Step 1, background electric signal and sample electrical signal are filtered respectively and enhanced processing；
Step 2, two electric signals after processing differ the signal for being integrated into timesharing order transmission after electronic switch；
Step 3, the demodulated processing of signal and AD conversion after integration, obtain detection signal.
The step also includes pre-treatment, and the pre-treating method is：Standard formaldehyde gas is squeezed into laser detector, passed through
After modulated laser detection, the electric signal of standard formaldehyde after photo-detector receives.
The standard formaldehyde gas is air and formaldehyde gas mixture, and the concentration of formaldehyde of the standard formaldehyde gas is
20ppm。
Compared with prior art, the invention has the advantages that：
(1) present invention uses the sensing mode of two sub-beams, and the flashing for solving light beam determines and the drift of photoelectric device
The influence to signal is moved, ensures that detection signal is relevant by the concentration only with gas with the ratio of reference signal, accurate survey can be achieved
Amount.
(2) present invention uses wavelength modulation spectrum technology and signal amplification technique, and signal to noise ratio can be greatly improved, will be useful
Signal detects from noise, and functional reliability is high.
(3) present invention reduces the length of optical system, simplify the structure, greatly improve detection accuracy.
Embodiment
The present invention is described further with reference to embodiment：
Embodiment 1
A kind of method of laser detection formaldehyde gas, its step are as follows:
Step 1, drive signal is adjusted, frequency modulation semiconductor laser, it is special to ensure that modulation optical maser wavelength is fixed on tested gas
Levy on the specific wavelength spectral line of spectrum；
Step 2, background gas are passed through, ensure to be full of background gas in laser detector；
Step 3, modulation laser is made then to be received by photo-detector after reflecting plate, be obtained after output by background gas
Background electric signal；
Step 4, under test gas is passed through in laser detector, after modulated laser detection, photo-detector exports after receiving
Sample electrical signal；
Step 5, glitch-free detection signal will be obtained after sample electrical signal and background Electric signal processing.
Characteristic spectrum in the step 1 is 360nm spectral lines.
Background gas in the step 2 use air.
Reflecting plate in the step 3 be arranged in parallel with semiconductor laser, reaches the purpose that former circuit returns.
The spacing of reflecting plate and semiconductor laser in the step 3 is 2mm.
Under test gas in the step 4 is indoor formaldehyde air to be detected.
The processing method of background electric signal and sample electrical signal in the step 5 is as follows：
Step 1, background electric signal and sample electrical signal are filtered respectively and enhanced processing；
Step 2, two electric signals after processing differ the signal for being integrated into timesharing order transmission after electronic switch；
Step 3, the demodulated processing of signal and AD conversion after integration, obtain detection signal.
The step also includes pre-treatment, and the pre-treating method is：Standard formaldehyde gas is squeezed into laser detector, passed through
After modulated laser detection, the electric signal of standard formaldehyde after photo-detector receives.
The standard formaldehyde gas is air and formaldehyde gas mixture, and the concentration of formaldehyde of the standard formaldehyde gas is
20ppm。
Embodiment 2
A kind of method of laser detection formaldehyde gas, its step are as follows:
Step 1, drive signal is adjusted, frequency modulation semiconductor laser, it is special to ensure that modulation optical maser wavelength is fixed on tested gas
Levy on the specific wavelength spectral line of spectrum；
Step 2, background gas are passed through, ensure to be full of background gas in laser detector；
Step 3, modulation laser is made then to be received by photo-detector after reflecting plate, be obtained after output by background gas
Background electric signal；
Step 4, under test gas is passed through in laser detector, after modulated laser detection, photo-detector exports after receiving
Sample electrical signal；
Step 5, glitch-free detection signal will be obtained after sample electrical signal and background Electric signal processing.
Characteristic spectrum in the step 1 is 360nm spectral lines.
Background gas in the step 2 use air.
Reflecting plate in the step 3 be arranged in parallel with semiconductor laser, reaches the purpose that former circuit returns.
The spacing of reflecting plate and semiconductor laser in the step 3 is 10mm.
Under test gas in the step 4 is indoor formaldehyde air to be detected.
The processing method of background electric signal and sample electrical signal in the step 5 is as follows：
Step 1, background electric signal and sample electrical signal are filtered respectively and enhanced processing；
Step 2, two electric signals after processing differ the signal for being integrated into timesharing order transmission after electronic switch；
Step 3, the demodulated processing of signal and AD conversion after integration, obtain detection signal.
The step also includes pre-treatment, and the pre-treating method is：Standard formaldehyde gas is squeezed into laser detector, passed through
After modulated laser detection, the electric signal of standard formaldehyde after photo-detector receives.
The standard formaldehyde gas is air and formaldehyde gas mixture, and the concentration of formaldehyde of the standard formaldehyde gas is
20ppm。
Embodiment 3
A kind of method of laser detection formaldehyde gas, its step are as follows:
Step 1, drive signal is adjusted, frequency modulation semiconductor laser, it is special to ensure that modulation optical maser wavelength is fixed on tested gas
Levy on the specific wavelength spectral line of spectrum；
Step 2, background gas are passed through, ensure to be full of background gas in laser detector；
Step 3, modulation laser is made then to be received by photo-detector after reflecting plate, be obtained after output by background gas
Background electric signal；
Step 4, under test gas is passed through in laser detector, after modulated laser detection, photo-detector exports after receiving
Sample electrical signal；
Step 5, glitch-free detection signal will be obtained after sample electrical signal and background Electric signal processing.
Characteristic spectrum in the step 1 is 360nm spectral lines.
Background gas in the step 2 use air.
Reflecting plate in the step 3 be arranged in parallel with semiconductor laser, reaches the purpose that former circuit returns.
The spacing of reflecting plate and semiconductor laser in the step 3 is 6mm.
Under test gas in the step 4 is indoor formaldehyde air to be detected.
The processing method of background electric signal and sample electrical signal in the step 5 is as follows：
Step 1, background electric signal and sample electrical signal are filtered respectively and enhanced processing；
Step 2, two electric signals after processing differ the signal for being integrated into timesharing order transmission after electronic switch；
Step 3, the demodulated processing of signal and AD conversion after integration, obtain detection signal.
The step also includes pre-treatment, and the pre-treating method is：Standard formaldehyde gas is squeezed into laser detector, passed through
After modulated laser detection, the electric signal of standard formaldehyde after photo-detector receives.
The standard formaldehyde gas is air and formaldehyde gas mixture, and the concentration of formaldehyde of the standard formaldehyde gas is
20ppm。
Embodiment 4
The detection case of the detection method of detection method is as follows：
One embodiment of the invention is the foregoing is only, is not intended to limit the present invention, it is all to use equivalent substitution or equivalent transformation
The technical scheme that is obtained of mode, all fall within protection scope of the present invention.
Claims (9)
1. a kind of method of laser detection formaldehyde gas, its step are as follows:
Step 1, drive signal is adjusted, frequency modulation semiconductor laser, ensures that modulation optical maser wavelength is fixed on tested gas characteristic light
Compose on specific wavelength spectral line；
Step 2, background gas are passed through, ensure to be full of background gas in laser detector；
Step 3, modulation laser is made then to be received after reflecting plate by photo-detector by background gas, background is obtained after output
Electric signal；
Step 4, under test gas is passed through in laser detector, after modulated laser detection, photo-detector exports sample after receiving
Electric signal；
Step 5, glitch-free detection signal will be obtained after sample electrical signal and background Electric signal processing.
2. the method for a kind of laser detection formaldehyde gas according to claim 1, it is characterised in that in the step 1
Characteristic spectrum is 360nm spectral lines.
3. the method for a kind of laser detection formaldehyde gas according to claim 1, it is characterised in that in the step 2
Background gas use air.
4. the method for a kind of laser detection formaldehyde gas according to claim 1, it is characterised in that in the step 3
Reflecting plate be arranged in parallel with semiconductor laser, reaches the purpose that former circuit returns.
5. the method for a kind of laser detection formaldehyde gas according to claim 1, it is characterised in that in the step 3
The spacing of reflecting plate and semiconductor laser is 2-10mm.
6. the method for a kind of laser detection formaldehyde gas according to claim 1, it is characterised in that in the step 4
Under test gas is indoor formaldehyde air to be detected.
7. the method for a kind of laser detection formaldehyde gas according to claim 1, it is characterised in that in the step 5
The processing method of background electric signal and sample electrical signal is as follows：
Step 1, background electric signal and sample electrical signal are filtered respectively and enhanced processing；
Step 2, two electric signals after processing differ the signal for being integrated into timesharing order transmission after electronic switch；
Step 3, the demodulated processing of signal and AD conversion after integration, obtain detection signal.
8. the method for a kind of laser detection formaldehyde gas according to claim 7, it is characterised in that the step also includes
Pre-treatment, the pre-treating method are：Standard formaldehyde gas is squeezed into laser detector, after modulated laser detection, light is visited
Survey the electric signal of standard formaldehyde after device receives.
A kind of 9. method of laser detection formaldehyde gas according to claim 7, it is characterised in that the standard formaldehyde gas
Body is air and formaldehyde gas mixture, and the concentration of formaldehyde of the standard formaldehyde gas is 20ppm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710881754.6A CN107677639A (en) | 2017-09-26 | 2017-09-26 | A kind of method of laser detection formaldehyde gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710881754.6A CN107677639A (en) | 2017-09-26 | 2017-09-26 | A kind of method of laser detection formaldehyde gas |
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| Publication Number | Publication Date |
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| CN107677639A true CN107677639A (en) | 2018-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710881754.6A Pending CN107677639A (en) | 2017-09-26 | 2017-09-26 | A kind of method of laser detection formaldehyde gas |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113552084A (en) * | 2021-07-29 | 2021-10-26 | 深圳市先亚生物科技有限公司 | System, method and device for eliminating interference of spectrum detection background signal |
| CN114324781A (en) * | 2022-03-11 | 2022-04-12 | 中汽研汽车零部件检验中心(宁波)有限公司 | Intelligent sniffing method and system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101625318A (en) * | 2009-08-12 | 2010-01-13 | 南京信息工程大学 | Intelligent indoor gas formaldehyde concentration measuring apparatus |
| CN102353633A (en) * | 2011-06-15 | 2012-02-15 | 西安毅达信息系统有限公司 | Flue gas content laser on-line detection method and system |
| CN102749318A (en) * | 2012-07-19 | 2012-10-24 | 北京雪迪龙科技股份有限公司 | Device and method for detecting formaldehyde |
| CN103398976B (en) * | 2013-07-12 | 2015-12-16 | 河南汉威电子股份有限公司 | Reflective open circuit laser gas detection system |
-
2017
- 2017-09-26 CN CN201710881754.6A patent/CN107677639A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101625318A (en) * | 2009-08-12 | 2010-01-13 | 南京信息工程大学 | Intelligent indoor gas formaldehyde concentration measuring apparatus |
| CN102353633A (en) * | 2011-06-15 | 2012-02-15 | 西安毅达信息系统有限公司 | Flue gas content laser on-line detection method and system |
| CN102749318A (en) * | 2012-07-19 | 2012-10-24 | 北京雪迪龙科技股份有限公司 | Device and method for detecting formaldehyde |
| CN103398976B (en) * | 2013-07-12 | 2015-12-16 | 河南汉威电子股份有限公司 | Reflective open circuit laser gas detection system |
Non-Patent Citations (1)
| Title |
|---|
| A.GRATIEN ET AL.: "Laboratory intercomparison of the formaldehyde absorption cross sections in the infrared (1660-1820cm-1) and ultraviolet (300-360nm)spectral regions", 《JOURNAL OF GEOPHYSICAL RESEARCH》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113552084A (en) * | 2021-07-29 | 2021-10-26 | 深圳市先亚生物科技有限公司 | System, method and device for eliminating interference of spectrum detection background signal |
| CN114324781A (en) * | 2022-03-11 | 2022-04-12 | 中汽研汽车零部件检验中心(宁波)有限公司 | Intelligent sniffing method and system |
| CN114324781B (en) * | 2022-03-11 | 2022-12-02 | 中汽研汽车零部件检验中心(宁波)有限公司 | Intelligent sniffing method and system |
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Application publication date: 20180209 |
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