CN107091808A - A kind of anti-interference of stray light photodetector system based on digital servo-control - Google Patents
A kind of anti-interference of stray light photodetector system based on digital servo-control Download PDFInfo
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- CN107091808A CN107091808A CN201710554605.9A CN201710554605A CN107091808A CN 107091808 A CN107091808 A CN 107091808A CN 201710554605 A CN201710554605 A CN 201710554605A CN 107091808 A CN107091808 A CN 107091808A
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- interference
- light source
- system based
- digital servo
- amplifier
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- 238000005259 measurement Methods 0.000 claims abstract description 28
- 230000003287 optical effect Effects 0.000 claims abstract description 12
- 238000001514 detection method Methods 0.000 claims description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 abstract description 9
- 239000003344 environmental pollutant Substances 0.000 abstract description 5
- 231100000719 pollutant Toxicity 0.000 abstract description 5
- KBPHJBAIARWVSC-RGZFRNHPSA-N lutein Chemical compound C([C@H](O)CC=1C)C(C)(C)C=1\C=C\C(\C)=C\C=C\C(\C)=C\C=C\C=C(/C)\C=C\C=C(/C)\C=C\[C@H]1C(C)=C[C@H](O)CC1(C)C KBPHJBAIARWVSC-RGZFRNHPSA-N 0.000 abstract description 2
- 229960005375 lutein Drugs 0.000 abstract description 2
- KBPHJBAIARWVSC-XQIHNALSSA-N trans-lutein Natural products CC(=C/C=C/C=C(C)/C=C/C=C(C)/C=C/C1=C(C)CC(O)CC1(C)C)C=CC=C(/C)C=CC2C(=CC(O)CC2(C)C)C KBPHJBAIARWVSC-XQIHNALSSA-N 0.000 abstract description 2
- FJHBOVDFOQMZRV-XQIHNALSSA-N xanthophyll Natural products CC(=C/C=C/C=C(C)/C=C/C=C(C)/C=C/C1=C(C)CC(O)CC1(C)C)C=CC=C(/C)C=CC2C=C(C)C(O)CC2(C)C FJHBOVDFOQMZRV-XQIHNALSSA-N 0.000 abstract description 2
- 235000008210 xanthophylls Nutrition 0.000 abstract description 2
- 238000005457 optimization Methods 0.000 description 7
- 230000004313 glare Effects 0.000 description 3
- 201000009310 astigmatism Diseases 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011896 sensitive detection Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/061—Sources
- G01N2201/06113—Coherent sources; lasers
- G01N2201/0612—Laser diodes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/062—LED's
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/064—Stray light conditioning
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Present specification is related to a kind of photodetector system, specifically related to a kind of anti-interference of stray light photodetector system based on digital servo-control, including light source, TTL signal generator, optical modulator, sensor, preamplifier, lock-in amplifier, TTL signal generator or optical modulator are modulated to light source, modulated light source and clutter interference light after modulated are converted into output measurement signal and interference signal through sensor, measurement signal and interference signal are delivered to lock-in amplifier after amplifying through preamplifier, lock-in amplifier is set to only allow to pass through with its frequency characteristic identical measurement signal.Measurement signal to noise ratio can be obviously improved by the system, effectively measurement lower limit can be expanded in the case where not lifting light source power, the usual weaker pollutant monitoring instrument of the measurement signal that is particularly suitable for use in, can also be applied to the spuious Xanthophyll cycle application of other optical gauges.
Description
Technical field
Present specification is related to a kind of photodetector system, more specifically to a kind of anti-veiling glare based on digital servo-control
Photodetector system is disturbed, belongs to environment monitoring device field.
Background technology
With increasingly strict, pollutant monitoring the instrument such as dust concentration tester, dusty gas point of environmentally friendly laws and regulations
Analyzer etc. all develops to minimum discharge technical field, the measurement lower limit and sensitivity requirement of monitoring instrument is increasingly improved, light
Learn detection technique and obtain increasing application.To natural light present in measuring environment, other ambient lighting light etc. are miscellaneous,
The processing of astigmatism interference problem decides the measurement signal to noise ratio of monitoring instrument, and then determines the performance and technology water of measuring instrument
It is flat.
Current pollutant monitoring field more and more uses optical detective technology, and interference of stray light often turns into influence and surveyed
The major issue of accuracy of measurement and stabilization of equipment performance, especially in minimum discharge field, the presence of interference signal may make equipment can not
Use.
The content of the invention
For technical problem present in prior art, modulated light source combination digital servo-control is used the invention provides one kind
Detection technique, can be obviously improved measurement signal to noise ratio, expand instrument Monitoring lower-cut, better conform to the skill that minimum discharge monitors field
The anti-interference of stray light photodetector system based on digital servo-control of art demand.
To achieve the above object, the invention provides a kind of anti-interference of stray light Photoelectric Detection system based on digital servo-control
System, including light source, TTL signal generator, optical modulator, sensor, preamplifier, lock-in amplifier, TTL signal occur
Device or optical modulator are modulated to light source, it is modulated after modulated light source and clutter interference light be converted into through sensor it is defeated
Go out measurement signal and interference signal, measurement signal and interference signal are delivered to lock-in amplifier after amplifying through preamplifier, lock
Phase amplifier is set to only allow to pass through with its frequency characteristic identical measurement signal.
As the further optimization of the technical program, the detection set of frequency of the lock-in amplifier is and modulation of source frequency
Rate is identical.
As the further optimization of the technical program, the light source is semiconductor laser diode.
As the further optimization of the technical program, the modulated light source is pulsed flasher.
As the further optimization of the technical program, the pulse frequency of the pulsed flasher is in 0-1000Hz scopes
It is interior adjustable.
As the further optimization of the technical program, as the further optimization of the technical program, the sensor is silicon
Photodiode.
As the further optimization of the technical program, the response time of the sensor is less than 1 microsecond.
Prior art is different from, above-mentioned technical proposal has the advantages that：
（1）The present invention uses modulated light source combination phase sensitive detection technology, and the survey of specific frequency is directed to using digital lock-in amplifier
Amount signal is amplified, and the different interference of stray light signal of rejection frequency characteristic, so that measurement signal to noise ratio is obviously improved, even if
In the presence of compared with strong jamming light source, accurate result can be also measured.
（2）The system of the present invention effectively can expand instrument Monitoring lower-cut in the case where not lifting light source power, especially
Suitable for the usual weaker pollutant monitoring instrument of measurement signal, the veiling glare that can be also applied to other optical gauges presses down
System application, can better conform to the technical need that minimum discharge monitors field.
Brief description of the drawings
Fig. 1 is system schematic of the invention.
Embodiment
To describe the technology contents of technical scheme in detail, feature, the objects and the effects being constructed, below in conjunction with specific reality
Apply example and coordinate accompanying drawing to be explained in detail.
Referring to Fig. 1, a kind of anti-interference of stray light photodetector system based on digital servo-control of the present embodiment, including light
Source, TTL signal generator, optical modulator, sensor, preamplifier, lock-in amplifier, TTL signal generator or optics
Modulator is modulated to light source, it is modulated after modulated light source and clutter interference light through sensor be converted into output measurement letter
Number and interference signal, measurement signal and interference signal are delivered to lock-in amplifier, lock-in amplifier after amplifying through preamplifier
It is set to only allow to pass through with its frequency characteristic identical measurement signal.
The detection set of frequency of the lock-in amplifier is identical with modulation of source frequency.
The light source is semiconductor laser diode.
The modulated light source is pulsed flasher.
The pulse frequency of the pulsed flasher is adjustable in the range of 0-1000Hz.
The sensor is silicon photoelectric diode.
The response time of the sensor is less than 1 microsecond.
During present invention work：Using semiconductor laser diode as light source, modulated or adjusted with optics with TTL electric signals
The mode of device machinery modulation processed, with reference to the photodetector system of digital servo-control detection technique.TTL signal generator level input or
Optical modulator realizes the modulation to light source, continuous light source is changed into pulsed flasher, its pulse frequency is in 0-1000Hz
In the range of it is adjustable.When in use, pulse frequency can be set as to the frequencies different from the interference light of scene presence, such as incandescent lamp
Disturb light frequency to be 50Hz under lighting environment, then the modulating frequency of light source is set as 100Hz.Sensor is small using the response time
In the silicon photoelectric diode of 1 microsecond, its output signal includes the frequency of measurement signal and light disturbance signal, wherein measurement signal
Rate characteristic is identical with the frequency characteristic of modulated light source, and light disturbance signal has different frequency characteristics.Sensor output letter
It is number generally fainter, deliver to lock-in amplifier after amplifying first by preamplifier.The detection frequency of lock-in amplifier is set
Be set to it is identical with modulation of source frequency, thus can be with the different light disturbance signal of rejection frequency characteristic, and only allow frequency
Characteristic identical measurement signal passes through.
By the system, regardless of veiling glare signal intensity, as long as sensor exports no saturation, it can effectively filter out
Light disturbance signal, and measurement signal is unaffected.Therefore, measurement signal to noise ratio has been obviously improved, light source work(can not lifted
Measurement lower limit is effectively expanded in the case of rate, the usual weaker pollutant monitoring instrument of the measurement signal that is particularly suitable for use in also can
Suitable for the spuious Xanthophyll cycle application of other optical gauges.
Although the various embodiments described above are described, those skilled in the art once know basic wound
The property made concept, then can make other change and modification to these embodiments, so embodiments of the invention are the foregoing is only,
Not thereby the scope of patent protection of the present invention, the equivalent structure that every utilization description of the invention and accompanying drawing content are made are limited
Or equivalent flow conversion, or other related technical fields are directly or indirectly used in, similarly it is included in the patent of the present invention
Within protection domain.
Claims (7)
1. a kind of anti-interference of stray light photodetector system based on digital servo-control, it is characterised in that including light source, TTL signal
Generator, optical modulator, sensor, preamplifier, lock-in amplifier, TTL signal generator or optical modulator are to light
Source is modulated, it is modulated after modulated light source and clutter interference light through sensor be converted into output measurement signal and interference believe
Number, measurement signal and interference signal are delivered to lock-in amplifier after amplifying through preamplifier, lock-in amplifier is set to only allow
Pass through with its frequency characteristic identical measurement signal.
2. a kind of anti-interference of stray light photodetector system based on digital servo-control according to claim 1, its feature exists
In the detection set of frequency of the lock-in amplifier is identical with modulation of source frequency.
3. a kind of anti-interference of stray light photodetector system based on digital servo-control according to claim 1, its feature exists
In the light source is semiconductor laser diode.
4. a kind of anti-interference of stray light photodetector system based on digital servo-control according to claim 1, its feature exists
In the modulated light source is pulsed flasher.
5. a kind of anti-interference of stray light photodetector system based on digital servo-control according to claim 4, its feature exists
In the pulse frequency of the pulsed flasher is adjustable in the range of 0-1000Hz.
6. a kind of anti-interference of stray light photodetector system based on digital servo-control according to claim 1, its feature exists
In the sensor is silicon photoelectric diode.
7. a kind of anti-interference of stray light photodetector system based on digital servo-control according to claim 6, its feature exists
In the response time of the sensor is less than 1 microsecond.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710554605.9A CN107091808A (en) | 2017-07-10 | 2017-07-10 | A kind of anti-interference of stray light photodetector system based on digital servo-control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710554605.9A CN107091808A (en) | 2017-07-10 | 2017-07-10 | A kind of anti-interference of stray light photodetector system based on digital servo-control |
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| Publication Number | Publication Date |
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| CN107091808A true CN107091808A (en) | 2017-08-25 |
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ID=59641102
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|---|---|---|---|
| CN201710554605.9A Pending CN107091808A (en) | 2017-07-10 | 2017-07-10 | A kind of anti-interference of stray light photodetector system based on digital servo-control |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107796771A (en) * | 2017-10-19 | 2018-03-13 | 桂林电子科技大学 | Absorb device and measuring method that alanysis instrument eliminates external stray light interference |
| CN109688352A (en) * | 2017-10-19 | 2019-04-26 | 沈阳飞欧光电科技有限公司 | A kind of phase-locked array photoelectric detection module and method |
| CN110501305A (en) * | 2019-09-09 | 2019-11-26 | 安徽岩芯光电技术有限公司 | A kind of detection device and method of vehicle exhaust |
| CN111721709A (en) * | 2020-01-22 | 2020-09-29 | 中国科学院上海微系统与信息技术研究所 | Method and device for improving signal-to-noise ratio of silicon nanowire sensor by utilizing optical modulation |
| CN113108696A (en) * | 2021-04-06 | 2021-07-13 | 合肥埃科光电科技有限公司 | Light source wavelength scanning spectrum confocal sensor |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107796771A (en) * | 2017-10-19 | 2018-03-13 | 桂林电子科技大学 | Absorb device and measuring method that alanysis instrument eliminates external stray light interference |
| CN109688352A (en) * | 2017-10-19 | 2019-04-26 | 沈阳飞欧光电科技有限公司 | A kind of phase-locked array photoelectric detection module and method |
| CN110501305A (en) * | 2019-09-09 | 2019-11-26 | 安徽岩芯光电技术有限公司 | A kind of detection device and method of vehicle exhaust |
| CN111721709A (en) * | 2020-01-22 | 2020-09-29 | 中国科学院上海微系统与信息技术研究所 | Method and device for improving signal-to-noise ratio of silicon nanowire sensor by utilizing optical modulation |
| CN111721709B (en) * | 2020-01-22 | 2021-08-17 | 中国科学院上海微系统与信息技术研究所 | Method and device for improving signal-to-noise ratio of silicon nanowire sensor by utilizing optical modulation |
| WO2021148058A3 (en) * | 2020-01-22 | 2021-09-16 | 中国科学院上海微系统与信息技术研究所 | Method and apparatus for using optical modulation to improve signal-to-noise ratio in silicon nanowire sensor |
| CN113108696A (en) * | 2021-04-06 | 2021-07-13 | 合肥埃科光电科技有限公司 | Light source wavelength scanning spectrum confocal sensor |
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Address after: Unit 101, 1726 Gangzhong Road, Xiamen Section, China (Fujian) Free Trade Pilot Area, Xiamen City, Fujian Province Applicant after: Xishi (Xiamen) Technology Co.,Ltd. Address before: Unit 101, 1726 Gangzhong Road, Xiamen Section, China (Fujian) Free Trade Pilot Area, Xiamen City, Fujian Province Applicant before: XISHI (XIAMEN) TECHNOLOGY CO.,LTD. |
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Application publication date: 20170825 |
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