CN113739952B - Fluorescent optical fiber temperature measurement method with self-diagnosis function - Google Patents
Fluorescent optical fiber temperature measurement method with self-diagnosis function Download PDFInfo
- Publication number
- CN113739952B CN113739952B CN202110796853.0A CN202110796853A CN113739952B CN 113739952 B CN113739952 B CN 113739952B CN 202110796853 A CN202110796853 A CN 202110796853A CN 113739952 B CN113739952 B CN 113739952B
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- excitation
- light
- light source
- module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000004092 self-diagnosis Methods 0.000 title claims abstract description 16
- 238000009529 body temperature measurement Methods 0.000 title claims abstract description 15
- 230000005284 excitation Effects 0.000 claims abstract description 63
- 230000005540 biological transmission Effects 0.000 claims abstract description 19
- 230000003321 amplification Effects 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 15
- 230000003287 optical effect Effects 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims description 11
- 238000004458 analytical method Methods 0.000 claims description 6
- 238000013459 approach Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000000523 sample Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000005281 excited state Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention provides a fluorescent optical fiber temperature measurement method with a self-diagnosis function, which consists of an MCU control module, a light source excitation module, a light transmission light path, a fluorescent optical fiber sensor, a photoelectric conversion module and a reverse amplification module, wherein the MCU control module controls the light source excitation module to emit light, the light enters the fluorescent optical fiber sensor through the light transmission light path, stimulated signals reflected back after the fluorescent optical fiber sensor is excited return from the light transmission light path, the stimulated signals enter the photoelectric conversion module to be converted into voltage signals, and the voltage signals are reversely amplified by the reverse amplification module and then are collected by the MCU control module, and the invention has the beneficial effects that: the invention adopts the fluorescent optical fiber temperature measurement method with the self-diagnosis function, and can rapidly and effectively identify the fault type of the fluorescent temperature measurement probe by reversely amplifying the fluorescent stimulated signals and analyzing the voltages at different points, detect the quality of the optical path, properly adjust the temperature demodulation algorithm, reduce the measurement error caused by the quality problem of the optical path and prolong the service life of the system.
Description
[ Field of technology ]
The invention belongs to the technical field of optical fiber sensing temperature measurement, and particularly relates to a fluorescent optical fiber temperature measurement method with a self-diagnosis function.
[ Background Art ]
The fluorescent optical fiber temperature measurement technology is a measurement technology which uses a light source signal as excitation to demodulate a fluorescent service life signal so as to obtain temperature information, has the characteristics of accurate temperature measurement, high resolution, quick dynamic response, strong electromagnetic interference resistance and the like, is particularly suitable for temperature measurement under severe environments with strong electromagnetic fields, high temperature, corrosion, high pressure and explosion danger, and is characterized in that after fluorescent substances at the tail end of a fluorescent optical fiber sensor are subjected to light radiation with a certain wavelength, electron absorption photons are transited from a low energy level to an excited state high energy level and then are returned from the high energy level to the radiation transition of the low energy level to emit fluorescence, and after the excitation is stopped, the excited fluorescence is usually attenuated in an exponential manner; however, in practical application, it is found that due to poor manufacturing consistency of the optical fiber optical path device and the conditions of bending of the optical fiber, abrasion and falling of fluorescent substances, aging of the sensor and the like existing in the installation process of the fluorescent optical fiber sensor, the reflected light loss is large, and the fluorescent attenuation signal curve cannot quickly conform to an exponential attenuation formula, so that the fluorescent life curve is unstable, and the calculation temperature is greatly influenced.
[ Invention ]
The invention aims to solve the problems of the prior optical fiber sensing temperature measurement and provides a fluorescent optical fiber temperature measurement method with a self-diagnosis function.
The invention is realized by the following technical scheme: when the fluorescent optical fiber is used for measuring the temperature, after excitation light is reflected by fluorescent substances, a reverse amplifier reversely amplifies a fluorescent reflected signal, and then the self-diagnosis judgment is carried out by comparing the voltage of a special point, and the method comprises the following steps:
S1, an MCU control module generates a stable light source with fixed period and adjustable light source intensity by controlling a light emitting diode of a light source excitation module, and light emitted by the excitation light source module enters a fluorescent optical fiber sensor through a light transmission light path;
S2, the excited signal reflected by the excited fluorescent substance of the fluorescent optical fiber sensor returns in a primary way, enters the photoelectric conversion module from the light transmission optical path and is converted into a voltage signal, and the voltage signal is reversely amplified and then collected by the MCU control module;
s3, comparing the acquired voltage signals, and adjusting the intensity of the excitation light source and the reference level of the inverting amplifier to enable the converted voltage signals to reach the balance condition;
and S4, obtaining corresponding demodulation information according to the comparison result, judging whether the optical path is good, and thus adjusting a temperature demodulation algorithm to obtain corresponding temperature information.
Further, the specific collection method of the excitation light source is as follows: the MCU control module performs four-time electric signal collection, the MCU control module performs the first collection at a first time point t0 after the light source excitation module is turned on, the level value of the fluorescence excitation electric signal is V (t 0), the second collection is performed at a middle time point t1, the level value of the fluorescence excitation electric signal is V (t 1), the third collection is performed at a time point t2 close to the time point before the light source signal is turned off, the level value of the fluorescence excitation electric signal is V (t 2), the fourth collection is performed at a time point t3 before the light source excitation module is turned on next time, the level value of the fluorescence excitation electric signal is V (t 3), and then analysis is performed according to the four collected values.
Further, the specific method for analyzing the collected four values is as follows: comparing the four collected voltage signals, and properly adjusting the intensity of the excitation light source and the reference level of the inverting amplifier to ensure that the converted voltage signals reach the balance condition;
If V (t 0) > V (t 1), and V (t 2) =0, the excitation signal is diagnosed as being too strong, the duty ratio of PWM is reversely adjusted, and the reverse amplification factor is also adjusted, and if V (t 0) -V (t 1) < Δv, and V (t 2) < Δx, about 0, the optical path is determined to be good;
If V (t 0) > V (t 1) and V (t 2) >0, the excitation signal is diagnosed to be too weak, the duty ratio of PWM is adjusted in the forward direction, the amplitude of the excitation light source is adjusted, the reverse amplification factor is also adjusted, and if the adjustment is carried out to V (t 0) -V (t 1) < DeltaV and V (t 2) < DeltaX, the adjustment is about 0, the light path is judged to be general;
if the light source is adjusted to the maximum, but V (t 2) is still larger than DeltaX, judging that the light path is poor, and an adjustment algorithm is needed to further compensate the error of analysis temperature data;
if V (t 0) ≡V (t 1) ≡V (t 2), it shows that there is no fluorescence to return, it is diagnosed that the light path is broken;
If V (t 0) > V (t 1) > V (t 2) setforth apprxeq 0, V (t 3) setapprxeq V (t 0) and V (t 3) < V (t 0), V (t 1), V (t 2) approximate exponential curve distribution, the fluorescence lifetime decay signal can be collected, and the temperature can be calculated according to the relation formula of fluorescence lifetime and temperature;
DeltaV is a constant standard, i.e. the difference between V (t 0) and V (t 1) is within a certain range, deltaX is a constant standard approaching 0, i.e. the fluorescence signal reaches a maximum before the end of the excitation signal, i.e. V (t 2) approaches 0 after the inversion.
Further, the fluorescent optical fiber temperature measuring method with the self-diagnosis function is mainly composed of an MCU control module, a light source excitation module, a light transmission light path, a fluorescent optical fiber sensor, a photoelectric conversion module and a reverse amplification module, wherein the MCU control module controls the light source excitation module to emit light, the light enters the fluorescent optical fiber sensor through the light transmission light path, the excited signal reflected back after the fluorescent substance of the fluorescent optical fiber sensor is excited returns in the original path, the excited signal enters the photoelectric conversion module from the light transmission light path, and the voltage signal converted by the photoelectric conversion module is reversely amplified by the reverse amplification module and is collected by the MCU control module.
The invention has the beneficial effects that: the invention adopts the fluorescent optical fiber temperature measurement method with the self-diagnosis function, and can rapidly and effectively identify the fault type of the fluorescent temperature measurement probe, detect the quality of the light path and timely and properly adjust the temperature demodulation algorithm by reversely amplifying the fluorescent stimulated signal and comparing the voltages at different points, thereby reducing the measurement error caused by the light path quality problem and prolonging the service life of the system.
[ Description of the drawings ]
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a block diagram of a system architecture of the present invention;
FIG. 3 is a waveform diagram of an excitation signal according to the present invention;
FIG. 4 is a waveform diagram of the photoelectric converted signal according to the present invention;
FIG. 5 is a waveform diagram of the fluorescent signal after reverse amplification according to the present invention;
FIG. 6 is an overall schematic of the excitation overdrive of the present invention;
FIG. 7 is a schematic diagram of the excitation weak adjustment of the present invention;
FIG. 8 is a schematic view of an optical path break according to the present invention;
reference numerals: 1. an MCU control module; 2. a light source excitation module; 3. a light transmission path; 4. a fluorescent optical fiber sensor; 5. a photoelectric conversion module; 6. and an inverse amplifying module.
[ Detailed description ] of the invention
The invention is further described with reference to the accompanying drawings and detailed description below:
As shown in fig. 1,2, 3,4 and 5, a method for measuring temperature of a fluorescent optical fiber with a self-diagnosis function, when measuring temperature of the fluorescent optical fiber, after excitation light is reflected by a fluorescent substance, a reverse amplifier reversely amplifies a fluorescent reflected signal, and then performs self-diagnosis judgment by comparing voltages of special points, comprises the following steps:
S1, an MCU control module generates a stable light source with fixed period and adjustable light source intensity by controlling a light emitting diode of a light source excitation module, and light emitted by the excitation light source module enters a fluorescent optical fiber sensor through a light transmission light path;
S2, the excited signal reflected by the excited fluorescent substance of the fluorescent optical fiber sensor returns in a primary way, enters the photoelectric conversion module from the light transmission optical path and is converted into a voltage signal, and the voltage signal is reversely amplified and then collected by the MCU control module;
s3, comparing the acquired voltage signals, and adjusting the intensity of the excitation light source and the reference level of the inverting amplifier to enable the converted voltage signals to reach the balance condition;
and S4, obtaining corresponding demodulation information according to the comparison result, judging whether the optical path is good, and thus adjusting a temperature demodulation algorithm to obtain corresponding temperature information.
Further, the specific collection method of the excitation light source is as follows: the MCU control module performs four-time electric signal collection, the MCU control module performs the first collection at a first time point t0 after the light source excitation module is turned on, the level value of the fluorescence excitation electric signal is V (t 0), the second collection is performed at a middle time point t1, the level value of the fluorescence excitation electric signal is V (t 1), the third collection is performed at a time point t2 close to the time point before the light source signal is turned off, the level value of the fluorescence excitation electric signal is V (t 2), the fourth collection is performed at a time point t3 before the light source excitation module is turned on next time, the level value of the fluorescence excitation electric signal is V (t 3), and then analysis is performed according to the four collected values.
Further, the specific method for analyzing the collected four values is as follows: comparing the four collected voltage signals, and properly adjusting the intensity of the excitation light source and the reference level of the inverting amplifier to ensure that the converted voltage signals reach the balance condition;
If V (t 0) > V (t 1), and V (t 2) =0, the excitation signal is diagnosed as being too strong, the duty ratio of PWM is reversely adjusted, and the reverse amplification factor is also adjusted, and if V (t 0) -V (t 1) < Δv, and V (t 2) < Δx, about 0, the optical path is determined to be good;
If V (t 0) > V (t 1) and V (t 2) >0, the excitation signal is diagnosed to be too weak, the duty ratio of PWM is adjusted in the forward direction, the amplitude of the excitation light source is adjusted, the reverse amplification factor is also adjusted, and if the adjustment is carried out to V (t 0) -V (t 1) < DeltaV and V (t 2) < DeltaX, the adjustment is about 0, the light path is judged to be general;
if the light source is adjusted to the maximum, but V (t 2) is still larger than DeltaX, judging that the light path is poor, and an adjustment algorithm is needed to further compensate the error of analysis temperature data;
if V (t 0) ≡V (t 1) ≡V (t 2), it shows that there is no fluorescence to return, it is diagnosed that the light path is broken;
If V (t 0) > V (t 1) > V (t 2) setforth apprxeq 0, V (t 3) setapprxeq V (t 0) and V (t 3) < V (t 0), V (t 1), V (t 2) approximate exponential curve distribution, the fluorescence lifetime decay signal can be collected, and the temperature can be calculated according to the relation formula of fluorescence lifetime and temperature;
DeltaV is a constant standard, i.e. the difference between V (t 0) and V (t 1) is within a certain range, deltaX is a constant standard approaching 0, i.e. the fluorescence signal reaches a maximum before the end of the excitation signal, i.e. V (t 2) approaches 0 after the inversion.
Further, the fluorescent optical fiber temperature measuring method with the self-diagnosis function is mainly composed of an MCU control module 1, a light source excitation module 2, a light transmission light path 3, a fluorescent optical fiber sensor 4, a photoelectric conversion module 5 and a reverse amplification module 6, wherein the MCU control module 1 controls the light source excitation module 2 to emit light, the light enters the fluorescent optical fiber sensor 4 through the light transmission light path 3, excited signals reflected by fluorescent substances of the fluorescent optical fiber sensor 4 after excitation return from an original path, the excited signals enter the photoelectric conversion module 5 from the light transmission light path 3, and voltage signals converted by the photoelectric conversion module 5 are reversely amplified by the reverse amplification module 6 and are collected by the MCU control module 1.
Modifications and variations of the above embodiments will be apparent to those skilled in the art in light of the above teachings. Therefore, the invention is not limited to the specific embodiments disclosed and described above, but some modifications and changes of the invention should be also included in the scope of the claims of the invention. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present invention in any way.
Claims (2)
1. A fluorescent optical fiber temperature measurement method with a self-diagnosis function is characterized in that when the fluorescent optical fiber is used for measuring temperature, after excitation light is reflected by fluorescent substances, a reverse amplifier reversely amplifies fluorescent reflection signals, and then the self-diagnosis judgment is carried out by comparing voltages of special points, and the method comprises the following steps:
S1, an MCU control module generates a stable light source with fixed period and adjustable light source intensity by controlling a light emitting diode of a light source excitation module, and light emitted by the excitation light source module enters a fluorescent optical fiber sensor through a light transmission light path;
S2, the excited signal reflected by the excited fluorescent substance of the fluorescent optical fiber sensor returns in a primary way, enters the photoelectric conversion module from the light transmission optical path and is converted into a voltage signal, and the voltage signal is reversely amplified and then collected by the MCU control module;
s3, comparing the acquired voltage signals, and adjusting the intensity of the excitation light source and the reference level of the inverting amplifier to enable the converted voltage signals to reach the balance condition;
s4, obtaining corresponding demodulation information according to the comparison result, judging whether the optical path is good, and accordingly adjusting a temperature demodulation algorithm to obtain corresponding temperature information;
The specific collection method of the excitation light source is as follows: the MCU control module performs four-time electric signal collection, the MCU control module performs the first collection at a first time point t0 after the light source excitation module is turned on, the level value of the fluorescence excitation electric signal is V (t 0), the second collection is performed at a middle time point t1, the level value of the fluorescence excitation electric signal is V (t 1), the third collection is performed at a time point t2 close to the time point before the light source signal is turned off, the level value of the fluorescence excitation electric signal is V (t 2), the fourth collection is performed at a time point t3 before the light source excitation module is turned on next time, the level value of the fluorescence excitation electric signal is V (t 3), and then analysis is performed according to the four collected values;
the specific method for analyzing the collected four values is as follows: comparing the four collected voltage signals, and properly adjusting the intensity of the excitation light source and the reference level of the inverting amplifier to ensure that the converted voltage signals reach the balance condition;
If V (t 0) > V (t 1), and V (t 2) =0, the excitation signal is diagnosed as being too strong, the duty ratio of PWM is reversely adjusted, and the reverse amplification factor is also adjusted, and if V (t 0) -V (t 1) < Δv, and V (t 2) < Δx, about 0, the optical path is determined to be good;
If V (t 0) > V (t 1) and V (t 2) >0, the excitation signal is diagnosed to be too weak, the duty ratio of PWM is adjusted in the forward direction, the amplitude of the excitation light source is adjusted, the reverse amplification factor is also adjusted, and if the adjustment is carried out to V (t 0) -V (t 1) < DeltaV and V (t 2) < DeltaX, the adjustment is about 0, the light path is judged to be general;
if the light source is adjusted to the maximum, but V (t 2) is still larger than DeltaX, judging that the light path is poor, and an adjustment algorithm is needed to further compensate the error of analysis temperature data;
if V (t 0) ≡V (t 1) ≡V (t 2), it shows that there is no fluorescence to return, it is diagnosed that the light path is broken;
If V (t 0) > V (t 1) > V (t 2) setforth apprxeq 0, V (t 3) setapprxeq V (t 0) and V (t 3) < V (t 0), V (t 1), V (t 2) approximate exponential curve distribution, the fluorescence lifetime decay signal can be collected, and the temperature can be calculated according to the relation formula of fluorescence lifetime and temperature;
DeltaV is a constant standard, i.e. the difference between V (t 0) and V (t 1) is within a certain range, deltaX is a constant standard approaching 0, i.e. the fluorescence signal reaches a maximum before the end of the excitation signal, i.e. V (t 2) approaches 0 after the inversion.
2. The method for measuring the temperature of the fluorescent optical fiber with the self-diagnosis function according to claim 1, wherein the method comprises the following steps: the fluorescent optical fiber temperature measuring method with the self-diagnosis function is mainly composed of an MCU control module, a light source excitation module, a light transmission light path, a fluorescent optical fiber sensor, a photoelectric conversion module and a reverse amplification module, wherein the MCU control module controls the light source excitation module to emit light, the light enters the fluorescent optical fiber sensor through the light transmission light path, the excited signal reflected back after the fluorescent substance of the fluorescent optical fiber sensor is excited returns in an original path, the excited signal enters the photoelectric conversion module from the light transmission light path, and the voltage signal converted by the photoelectric conversion module is reversely amplified through the reverse amplification module and is collected by the MCU control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110796853.0A CN113739952B (en) | 2021-07-14 | 2021-07-14 | Fluorescent optical fiber temperature measurement method with self-diagnosis function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110796853.0A CN113739952B (en) | 2021-07-14 | 2021-07-14 | Fluorescent optical fiber temperature measurement method with self-diagnosis function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113739952A CN113739952A (en) | 2021-12-03 |
| CN113739952B true CN113739952B (en) | 2024-06-18 |
Family
ID=78728658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110796853.0A Active CN113739952B (en) | 2021-07-14 | 2021-07-14 | Fluorescent optical fiber temperature measurement method with self-diagnosis function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113739952B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116448282B (en) * | 2023-06-16 | 2023-09-01 | 应急管理部沈阳消防研究所 | Fault self-diagnosis method of fluorescent optical fiber temperature measurement sensor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103428982A (en) * | 2013-05-28 | 2013-12-04 | 福州英诺电子科技有限公司 | Light intensity self-adjusting circuit for fluorescence fiber stimulation |
| CN104568121A (en) * | 2015-01-14 | 2015-04-29 | 东南大学 | Method and device for comprehensively controlling parameters of high-adaptability optical fiber vibration sensing system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203367744U (en) * | 2013-07-26 | 2013-12-25 | 武汉理工光科股份有限公司 | Self-diagnosis and adaptive tunable laser |
| WO2016056886A1 (en) * | 2014-10-09 | 2016-04-14 | Mimos Berhad | A system and method for measuring a fluorescence emission signal with phase correction in phase fluorometric |
| JP6459928B2 (en) * | 2015-11-26 | 2019-01-30 | 京セラドキュメントソリューションズ株式会社 | Optical scanning device and image forming apparatus using the same |
| CN107044890B (en) * | 2017-01-09 | 2019-08-30 | 辽宁达能电气股份有限公司 | Fluorescence fiber temperature measurement device and method adaptive over long distances |
| CN107516807A (en) * | 2017-08-17 | 2017-12-26 | 北京航空航天大学 | Based on FPGA is automatic temperature-controlled and the implementation method of the wideband light source of automated power control |
-
2021
- 2021-07-14 CN CN202110796853.0A patent/CN113739952B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103428982A (en) * | 2013-05-28 | 2013-12-04 | 福州英诺电子科技有限公司 | Light intensity self-adjusting circuit for fluorescence fiber stimulation |
| CN104568121A (en) * | 2015-01-14 | 2015-04-29 | 东南大学 | Method and device for comprehensively controlling parameters of high-adaptability optical fiber vibration sensing system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113739952A (en) | 2021-12-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8653434B2 (en) | Avalanche photodiode operating voltage selection algorithm | |
| CN113739952B (en) | Fluorescent optical fiber temperature measurement method with self-diagnosis function | |
| CA2132271C (en) | Improved data collection method for use with chemical sensors | |
| CN103969200B (en) | For the method measuring gas composition concentration in measuring gas | |
| CN102098016A (en) | Control device and control method for gain stabilization of avalanche photodiode | |
| CN113790820B (en) | Fluorescent optical fiber temperature measurement method with self-adaptive adjustment function | |
| KR20160096470A (en) | Optical line monitoring system with trace-baced auto gain control and method thereof | |
| CN111122541A (en) | Optical fiber probe system for distinguishing Raman signal and fluorescence signal | |
| CN116448282B (en) | Fault self-diagnosis method of fluorescent optical fiber temperature measurement sensor | |
| US20230288538A1 (en) | Laser receiving system and laser ranging system | |
| CN101770030A (en) | Distance measuring device and control method thereof | |
| CN113933268B (en) | Optical detection device and optical detection method | |
| CN114281137B (en) | Method, device and system for controlling bias voltage of photoelectric detector and laser radar | |
| Wood | Establishing and maintaining system linearity | |
| CN215987067U (en) | APD reverse bias voltage generation circuit applied to DTS | |
| CN111504497B (en) | Temperature measurement method based on fluorescent optical fiber | |
| CN201504347U (en) | Constant light source control system of atmospheric visibility meter | |
| CN114112913A (en) | Infrared light source weighting modulation system and method | |
| CN113900072A (en) | Method, device and system for adjusting bias voltage by using non-probe light and laser radar | |
| CN111397761A (en) | Fluorescence lifetime signal processing and demodulating method | |
| CN206208903U (en) | A kind of colloid gold test paper adaptive background high resolution detection circuit | |
| CN212013138U (en) | Low-noise high-dynamic-range photoelectric conversion device | |
| CN117148368B (en) | APD and optimal gain determining method, control method, device and laser radar thereof | |
| KR20190030184A (en) | Sensor having improved detection capability | |
| CN118465735B (en) | Dual-photoelectric sensor and signal processing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |