CN110579431A - Self-adaptive dimmer and dimming measuring method thereof - Google Patents
Self-adaptive dimmer and dimming measuring method thereof Download PDFInfo
- Publication number
- CN110579431A CN110579431A CN201910873818.7A CN201910873818A CN110579431A CN 110579431 A CN110579431 A CN 110579431A CN 201910873818 A CN201910873818 A CN 201910873818A CN 110579431 A CN110579431 A CN 110579431A
- Authority
- CN
- China
- Prior art keywords
- control unit
- micro control
- mcu
- electric signal
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title abstract description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 26
- 238000006243 chemical reaction Methods 0.000 claims abstract description 24
- 230000003321 amplification Effects 0.000 claims abstract description 21
- 238000004364 calculation method Methods 0.000 claims abstract description 8
- 230000003044 adaptive effect Effects 0.000 claims description 8
- 238000000691 measurement method Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 abstract description 9
- 239000000779 smoke Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/075—Investigating concentration of particle suspensions by optical means
Landscapes
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Automation & Control Theory (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a self-adaptive dimmer and a dimming measuring method thereof, wherein the method comprises the following steps: (1) the receiving source receives the light emitted by the light emitting source; (2) the receiving source converts the received light intensity signal into an electric signal; (3) the electric signal is sent to a Micro Control Unit (MCU), and the MCU calculates the corresponding dimming rate according to the variation of the received electric signal; (4) and the micro control unit MCU adjusts the analog voltage output by the digital-to-analog conversion module DA in the micro control unit MCU according to the dimming rate obtained by calculation. All working states of the dimmer are judged by the micro control unit MCU and the analog voltage output by the digital-to-analog conversion module DA is adjusted according to the judgment result, so that the self-adaptive amplification output in the range from 0 ℃ to even-10 ℃ to 60 ℃ can be completely realized, and the test requirements of national standard and even European standard are completely met.
Description
Technical Field
The invention relates to the field of digital signal processing, in particular to a self-adaptive dimmer and a dimming measuring method thereof.
Background
When the sensitivity of the smoke alarm is measured, the basis is the smoke concentration when the alarm gives an alarm; the smoke concentration is measured according to the attenuation amount of the current smoke concentration to light, namely, the dimming rate is measured to determine the smoke concentration, so that the sensitivity of the smoke alarm is determined.
Currently, in the devices for measuring the dimming ratio, there are a light emitting source and a receiving source, the receiving source is used to receive the light intensity from the light emitting source, and the corresponding dimming ratio is calculated according to the variation of the received light intensity, but the temperature characteristic of the light emitting source greatly affects the effectiveness of the emitted light of the light emitting source.
In the European standard, the precision of the smoke concentration is x.xxxdB/m, the precision requirement of the national standard dimming rate is xx.xx%/m, the resolution precision of at least 1/10000 can meet the standard precision requirement, and the resolution precision is usually 2 times that of the measurement accuracy, namely 1/20000.
In a general device, the precision of AD is 10 bits, and the power supply is 5V; the resolution of AD is then 5 mV. After the related filtering algorithm, the resolution of 1mV can be achieved.
The output of the receiving source is amplified by the amplifying module to output light intensity signals, and to meet the standard precision requirement, the requirement can be met only after multi-stage amplification cascade connection is needed, the block diagram of the amplifying module is shown in fig. 1, the amplitude of V1 output by the transconductance amplifying stage is about 200mV, and the requirements can be met after the last 2 stages are amplified by 10 times respectively. The output V2 after 10 times of amplification of the pre-amplifier stage is about 2V, the amplification of the post-amplifier stage adopts window amplification, namely, only 400mV of 1.6V-2V of the output of the pre-amplifier stage is amplified, so that slight change in smoke can be fully reflected, the range of the window can change along with the output change of the pre-amplifier stage, and therefore, the window can be adjusted by arranging a manual knob potentiometer in a photosensitive meter for some existing smoke boxes so as to adapt to different change ranges. The manual adjustment is introduced, so that the use is inconvenient, the potentiometer needs to be manually adjusted repeatedly when the high and low temperature test of a product is carried out, and the design of the adjustment range can cause the output variation amplitude to exceed the adjustment amplitude and be out of order.
disclosure of Invention
The present invention is directed to a self-adaptive dimmer and a dimming measurement method thereof, so as to solve the problems in the background art.
in order to achieve the purpose, the invention provides the following technical scheme:
A self-adaptive dimmer comprises a luminous source, a receiving source, a Micro Control Unit (MCU) and an amplification module;
The receiving source is used for receiving the light emitted by the light emitting source and converting the received light intensity signal into an electric signal;
The amplifying module is used for receiving the electric signal, amplifying the electric signal and outputting the amplified electric signal to a digital-to-analog conversion module DA of the micro control unit MCU; the amplifying module also receives the analog voltage output by the digital-to-analog conversion module DA and adjusts the intensity of the electric signal which can be sampled by the amplifying module according to the analog voltage output by the digital-to-analog conversion module DA;
The micro control unit MCU is used for receiving the signal output by the amplifying module, calculating the corresponding dimming rate according to the variation of the received signal, and adjusting the analog voltage output by the digital-to-analog conversion module DA in the micro control unit MCU according to the calculation result, so that the output of the amplifying module is always in a linear working area, and saturation or cut-off cannot occur.
As a further scheme of the present invention, the amplifying module includes a transconductance amplifying module, a pre-amplifying module, and a post-amplifying module, which are connected in sequence.
As a further scheme of the present invention, the post-amplification module employs a window comparator circuit.
As a further scheme of the present invention, the rear-stage amplification module includes an operational amplifier U1A and an operational amplifier U1B, a same-phase end of the operational amplifier U1A is connected to an output end DA _ OUT of a digital-to-analog conversion module DA IN the MCU, an inverting end of the operational amplifier U1A is connected to an output end of the operational amplifier U1A and a resistor R3, another end of the resistor R3 is connected to an inverting end of the resistor R2 and an inverting end of the operational amplifier U1B, a same-phase end of the operational amplifier U1B is connected to an output end IN _ PUT of the front-stage amplification module through the resistor R1, an output end of the operational amplifier U1B is connected to another end of the resistor R2 and the resistor R4, and another end of the resistor R4 is an.
As a further aspect of the present invention, the driving of the light emitting source employs constant current driving.
Further, the invention provides a self-adaptive dimming measurement method, which comprises the following steps: (1) the receiving source receives the light emitted by the light emitting source; (2) the receiving source converts the received light intensity signal into an electric signal; (3) the electric signal is sent to a Micro Control Unit (MCU), and the MCU calculates the corresponding dimming rate according to the variation of the received electric signal; (4) and the micro control unit MCU adjusts the analog voltage output by the digital-to-analog conversion module DA in the micro control unit MCU according to the dimming rate obtained by calculation.
Particularly, the electric signal in the step (3) can be amplified and then sent to the micro control unit MCU, and the micro control unit MCU calculates the corresponding dimming ratio according to the variation of the received amplified signal.
compared with the prior art, the invention has the beneficial effects that: all working states of the dimmer are judged by the micro control unit MCU and the analog voltage output by the digital-to-analog conversion module DA is regulated according to the judgment result, so that the self-adaptive amplification output in the range from 0 ℃ to even-10 ℃ to 60 ℃ can be completely realized, and the test requirements of national standard and even European standard are completely met; meanwhile, based on the characteristics of the self-adaptive optical sensor, the subsequent test can be fully automated, and great test convenience is brought to a special test mechanism.
drawings
Fig. 1 is a schematic block diagram of a prior art circuit.
FIG. 2 is a block diagram of the working principle of the adaptive dimmer of the present invention.
Fig. 3 is a circuit diagram of a post-amplification module according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A self-adaptive dimmer comprises a luminous source, a receiving source, a Micro Control Unit (MCU) and an amplification module;
The receiving source is used for receiving the light emitted by the light emitting source and converting the received light intensity signal into an electric signal;
The amplifying module is used for receiving the electric signal, amplifying the electric signal and outputting the amplified electric signal to a digital-to-analog conversion module DA of the micro control unit MCU; the amplifying module also receives the analog voltage output by the digital-to-analog conversion module DA and adjusts the intensity of the electric signal which can be sampled by the amplifying module according to the analog voltage output by the digital-to-analog conversion module DA;
The micro control unit MCU is used for receiving the signal output by the amplifying module, calculating the corresponding dimming rate according to the variation of the received signal, and adjusting the analog voltage output by the digital-to-analog conversion module DA in the micro control unit MCU according to the calculation result, so that the output of the amplifying module is always in a linear working area, and saturation or cut-off cannot occur.
As a specific embodiment of the present invention, the amplifying module may be composed of a transconductance amplifying module, a pre-amplifying module, and a post-amplifying module, which are connected in sequence.
furthermore, the post-amplification module adopts a window comparator circuit.
referring to fig. 3, the rear-stage amplification module includes an operational amplifier U1A and an operational amplifier U1B, a non-inverting terminal of the operational amplifier U1A is connected to a DA output terminal DA _ OUT of the digital-to-analog conversion module IN the MCU, an inverting terminal of the operational amplifier U1A is connected to an output terminal of the operational amplifier U1A and a resistor R3, the other terminal of the resistor R3 is connected to a resistor R2 and a non-inverting terminal of the operational amplifier U1B, a non-inverting terminal of the operational amplifier U1B is connected to an output terminal IN _ PUT of the front-stage amplification module through a resistor R1, an output terminal of the operational amplifier U1B is connected to the other terminal of the resistor R2 and the resistor R4, and the other terminal of the resistor R4 is.
Since the output load of the digital-to-analog conversion module DA of the micro control unit MCU is small, the operational amplifier U1A is used for forming the emission and the load enhancement, and IN _ PUT is the output end of the pre-amplification module and is also the signal input end of the post-amplification module. IN the design of the light sensor, the small variation of the IN _ PUT needs to be measured, the output of the pre-amplification module is close to the full amplitude, but the measurement requirement cannot be met because the measurable variation is 1/5000 (the full amplitude output is taken as a limit), while IN the dimming ratio measurement, the unit of national standard is xx.xx%, the unit of european standard is dB/m, and the unit of national standard can directly see that the accuracy is at least 1/10000, which is described IN the background section.
To achieve a resolution accuracy of at least 1/20000 as described IN the background, the present invention uses a window amplification circuit to further amplify the IN _ PUT.
Referring to FIG. 3, IN the window amplifier circuit, the amplification range is the amplitude between IN _ PUT and DA _ OUT; when the IN _ PUT approaches the DA _ OUT, the OUT _ PUT approaches the ground level, and then the DA _ OUT output by the MCU can be further lowered to raise the OUT _ PUT, so as to continuously measure the small change of the IN _ PUT.
Further, the invention provides a self-adaptive dimming measurement method, which comprises the following steps: (1) the receiving source receives the light emitted by the light emitting source; (2) the receiving source converts the received light intensity signal into an electric signal; (3) the electric signal is sent to a Micro Control Unit (MCU), and the MCU calculates the corresponding dimming rate according to the variation of the received electric signal; (4) and the micro control unit MCU adjusts the analog voltage output by the digital-to-analog conversion module DA in the micro control unit MCU according to the dimming rate obtained by calculation.
In the self-adaptive dimming measurement method, a further embodiment can optimize the step (3), the electric signal obtained in the step (3) is amplified and then sent to the micro control unit MCU, and the micro control unit MCU calculates the corresponding dimming rate according to the variation of the received amplified signal.
In summary, all the working states of the dimmer are judged by the micro control unit MCU and the analog voltage output by the digital-to-analog conversion module DA is adjusted according to the judgment result, so that the adaptive amplification output in the range from 0 degree to 0 degree or even-10 degrees to 60 degrees can be achieved, and the test requirements of national standard and even european standard are met.
Based on the characteristics of the self-adaptive optical sensor, the subsequent test can be fully automated, which is very convenient for a special test mechanism.
it will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. A self-adaptive dimmer is characterized by comprising a luminous source, a receiving source, a Micro Control Unit (MCU) and an amplification module;
The receiving source is used for receiving the light emitted by the light emitting source and converting the received light intensity signal into an electric signal;
The amplifying module is used for receiving the electric signal, amplifying the electric signal and outputting the amplified electric signal to a digital-to-analog conversion module DA of the micro control unit MCU; the amplifying module also receives the analog voltage output by the digital-to-analog conversion module DA and adjusts the intensity of the electric signal which can be sampled by the amplifying module according to the analog voltage output by the digital-to-analog conversion module DA;
the micro control unit MCU is used for receiving the signal output by the amplifying module, calculating the corresponding dimming rate according to the variation of the received signal, and adjusting the analog voltage output by the digital-to-analog conversion module DA in the micro control unit MCU according to the calculation result, so that the output of the amplifying module is always in a linear working area, and saturation or cut-off cannot occur.
2. The adaptive dimmer according to claim 1, wherein the amplifying module comprises a transconductance amplifying module, a pre-amplifying module and a post-amplifying module connected in sequence.
3. The adaptive dimmer of claim 2 wherein said post-amplification block employs a window comparator circuit.
4. The adaptive dimmer according to claim 3, wherein the post-stage amplification module comprises an operational amplifier U1A and an operational amplifier U1B, the inverting terminal of the operational amplifier U1A is connected to the output terminal DA _ OUT of the digital-to-analog conversion module IN the MCU, the inverting terminal of the operational amplifier U1A is connected to the output terminal of the operational amplifier U1A and the resistor R3, the other terminal of the resistor R3 is connected to the inverting terminal of the resistor R2 and the inverting terminal of the operational amplifier U1B, the inverting terminal of the operational amplifier U1B is connected to the output terminal IN _ PUT of the pre-stage amplification module through the resistor R1, the output terminal of the operational amplifier U1B is connected to the other terminal of the resistor R2 and the resistor R4, and the other terminal of the resistor R4 is the output terminal of the post-stage amplification module.
5. the adaptive dimmer according to claim 1, wherein the driving of the light emitting source is constant current driving.
6. An adaptive dimming measurement method, comprising the steps of: (1) the receiving source receives the light emitted by the light emitting source; (2) the receiving source converts the received light intensity signal into an electric signal; (3) the electric signal is sent to a Micro Control Unit (MCU), and the MCU calculates the corresponding dimming rate according to the variation of the received electric signal; (4) and the micro control unit MCU adjusts the analog voltage output by the digital-to-analog conversion module DA in the micro control unit MCU according to the dimming rate obtained by calculation.
7. An adaptive dimming measurement method, comprising the steps of: (1) the receiving source receives the light emitted by the light emitting source; (2) the receiving source converts the received light intensity signal into an electric signal; (3) the electric signal is amplified and then sent to a Micro Control Unit (MCU), and the MCU calculates the corresponding dimming rate according to the variation of the received amplified signal; (4) and the micro control unit MCU adjusts the analog voltage output by the digital-to-analog conversion module DA in the micro control unit MCU according to the dimming rate obtained by calculation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910873818.7A CN110579431A (en) | 2019-09-17 | 2019-09-17 | Self-adaptive dimmer and dimming measuring method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910873818.7A CN110579431A (en) | 2019-09-17 | 2019-09-17 | Self-adaptive dimmer and dimming measuring method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110579431A true CN110579431A (en) | 2019-12-17 |
Family
ID=68813101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910873818.7A Pending CN110579431A (en) | 2019-09-17 | 2019-09-17 | Self-adaptive dimmer and dimming measuring method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110579431A (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85105779A (en) * | 1985-07-30 | 1987-02-04 | 报知机株式会社 | Photoelectric smoke sensor |
| CN201147314Y (en) * | 2007-10-11 | 2008-11-12 | 复旦大学 | Electrocardiogram R wave fast detecting electric appliance for cardiac defibrillator |
| CN201750619U (en) * | 2010-06-12 | 2011-02-16 | 深圳市协合欣电子有限公司 | Ionic blower fan calibration circuit |
| CN102494836A (en) * | 2011-11-29 | 2012-06-13 | 成都国光电气股份有限公司 | Thermocouple vacuum meter |
| CN103674240A (en) * | 2013-12-12 | 2014-03-26 | 杭州电子科技大学 | LED lamp illumination detection circuit |
| CN204190729U (en) * | 2014-11-19 | 2015-03-04 | 天津光电通信技术有限公司 | A kind of pulse amplitude adjustment unit |
| CN105136633A (en) * | 2015-08-12 | 2015-12-09 | 朱凌云 | Pulsed infrared dust concentration detection circuit |
| CN105788200A (en) * | 2016-05-18 | 2016-07-20 | 宁波科赛迪电子科技有限公司 | Smoke alarm sensitivity detection device |
| CN205580597U (en) * | 2016-04-18 | 2016-09-14 | 四川建筑职业技术学院 | Faint optical signal detection circuit |
| US20170176329A1 (en) * | 2015-12-21 | 2017-06-22 | Panasonic Intellectual Property Management Co., Ltd. | Particle sensor |
| CN108649933A (en) * | 2018-03-13 | 2018-10-12 | 佛山科学技术学院 | A kind of window voltage comparison circuit |
| CN209231210U (en) * | 2018-12-24 | 2019-08-09 | 河北大学 | A kind of adjustable near-infrared of transmission power receives and launch control unit |
| CN110208153A (en) * | 2018-08-01 | 2019-09-06 | 华帝股份有限公司 | Sensor circuit for range hood and range hood with sensor circuit |
-
2019
- 2019-09-17 CN CN201910873818.7A patent/CN110579431A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85105779A (en) * | 1985-07-30 | 1987-02-04 | 报知机株式会社 | Photoelectric smoke sensor |
| CN201147314Y (en) * | 2007-10-11 | 2008-11-12 | 复旦大学 | Electrocardiogram R wave fast detecting electric appliance for cardiac defibrillator |
| CN201750619U (en) * | 2010-06-12 | 2011-02-16 | 深圳市协合欣电子有限公司 | Ionic blower fan calibration circuit |
| CN102494836A (en) * | 2011-11-29 | 2012-06-13 | 成都国光电气股份有限公司 | Thermocouple vacuum meter |
| CN103674240A (en) * | 2013-12-12 | 2014-03-26 | 杭州电子科技大学 | LED lamp illumination detection circuit |
| CN204190729U (en) * | 2014-11-19 | 2015-03-04 | 天津光电通信技术有限公司 | A kind of pulse amplitude adjustment unit |
| CN105136633A (en) * | 2015-08-12 | 2015-12-09 | 朱凌云 | Pulsed infrared dust concentration detection circuit |
| US20170176329A1 (en) * | 2015-12-21 | 2017-06-22 | Panasonic Intellectual Property Management Co., Ltd. | Particle sensor |
| CN205580597U (en) * | 2016-04-18 | 2016-09-14 | 四川建筑职业技术学院 | Faint optical signal detection circuit |
| CN105788200A (en) * | 2016-05-18 | 2016-07-20 | 宁波科赛迪电子科技有限公司 | Smoke alarm sensitivity detection device |
| CN108649933A (en) * | 2018-03-13 | 2018-10-12 | 佛山科学技术学院 | A kind of window voltage comparison circuit |
| CN110208153A (en) * | 2018-08-01 | 2019-09-06 | 华帝股份有限公司 | Sensor circuit for range hood and range hood with sensor circuit |
| CN209231210U (en) * | 2018-12-24 | 2019-08-09 | 河北大学 | A kind of adjustable near-infrared of transmission power receives and launch control unit |
Non-Patent Citations (2)
| Title |
|---|
| 张静秋等: "基于集成运算放大器的窗口电压比较器的设计", 《电子制作》 * |
| 邹丽新等: "《单片微型计算机实验与实践》", 30 April 2017 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110987198B (en) | Space remote sensing infrared detector focal plane temperature precision measurement system | |
| CN105323001A (en) | OTDR optical signal receiving circuit | |
| US5376783A (en) | Power meter with background subtraction | |
| CN107238746B (en) | Micro-current measuring circuit for dielectric response test | |
| CN107816938B (en) | Circuit for automatically zeroing and modulating amplitude of interference system under low contrast and using method thereof | |
| CN116979369B (en) | Laser driving circuit and method for particulate matter concentration sensor | |
| CN107332529B (en) | Automatic gain control circuit for fully differential trans-impedance amplifier | |
| CN110579431A (en) | Self-adaptive dimmer and dimming measuring method thereof | |
| TW201939013A (en) | Multi-channel detecting system | |
| WO2003023328A1 (en) | Method for automatically adjusting measuring instrument and device using the same | |
| CN204631100U (en) | Be applicable to the high-speed light isolation voltage sensor of lightning surge environment | |
| CN207717224U (en) | A kind of novel luminous power meter | |
| US10401219B2 (en) | Optical parameter measurement device and optical parameter measurement method | |
| CN204789251U (en) | Leading treatment circuit of signal of particulate matter on -line monitoring appearance based on mie scattering | |
| CN104407193A (en) | Linear voltage sampling circuit | |
| CN112710453A (en) | LED lamp illumination detection circuit | |
| CN113686433A (en) | Photoelectric detector and erbium-doped optical fiber amplifier based on dark current compensation | |
| CN210603593U (en) | Miniature spectrometer control circuit | |
| CN214309130U (en) | Brightness detector suitable for tunnel | |
| CN117097335B (en) | High-sensitivity proximity light detection sensor | |
| CN112284554B (en) | Photon counting circuit with automatic threshold voltage setting and control functions | |
| CN218629419U (en) | Wide-range suspended matter sludge concentration measuring circuit | |
| CN110794384A (en) | Trans-impedance amplifier structure for laser ranging system | |
| CN112781772B (en) | Online tensiometer system and method | |
| CN213956734U (en) | LED lamp illumination detection circuit |
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 | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20191217 |