Circuit processing subsystem of particulate matter monitoring device

A technology for processing subsystems and monitoring devices, applied in the field of sensors, can solve problems such as background light interference, influence on the surrounding environment, noise, etc., achieve accurate and efficient particle monitoring, and solve the effect of severe noise

Pending Publication Date: 2021-05-11
上海北分科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing ultra-low emission laser scattering dust sensor has many shortcomings, for example: it is seriously interfered by background light, and the laboratory environment, the dark environment in the chimney, or the sunlight environment all have a great impact on the measurement data; The noise is serious and affects the surrounding environment; multi-range switching is often used to achieve high signal-to-noise ratio, but this operation method is likely to cause loopholes in environmental protection data falsification, etc.

Method used

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  • Circuit processing subsystem of particulate matter monitoring device
  • Circuit processing subsystem of particulate matter monitoring device
  • Circuit processing subsystem of particulate matter monitoring device

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Embodiment 1

[0028] Such as figure 1 As shown in FIG. 1 , a partial structural schematic diagram of the circuit processing subsystem of the particle monitoring device in an embodiment of the present application is shown. The circuit processing subsystem of the particle monitoring device of this embodiment includes a photoelectric detection unit 11, a high-impedance transconductance amplification unit 12, an AC coupling unit 13, a lock-in amplification unit 14, a differential amplification unit 15, an analog-to-digital conversion unit 16, and a control unit. Unit 17.

[0029] It should be noted that the particulate matter referred to in this embodiment mainly refers to solid particles suspended in the air, including but not limited to: dust, smoke, haze, mist, fine dust or smog, and the like.

[0030]Wherein, the photodetection unit 11 can adopt a photodetector, for example, to convert the optical signal collected from its detection area into an electrical signal; the high-impedance transc...

Embodiment 2

[0033] Such as figure 2 As shown in , a schematic structural diagram of the circuit processing subsystem of the particle monitoring device of the present application is shown. In this embodiment, the circuit processing subsystem of the particle monitoring device includes: a signal generator 201, a laser drive circuit 202, a laser 203, a photodetector 205, a high-impedance transconductance amplifier 206, an AC coupler 207, and a lock-in amplifier 208 , differential amplifier 209, analog-to-digital converter 210, and controller 211.

[0034] Wherein, the signal generator 201 generates a signal and sends it to the laser driving circuit 202 , the laser driving circuit 202 sends the driving signal to the laser 203 , and the laser 203 emits a laser signal to the measured object 204 .

[0035] The photodetector 205 is used to convert the optical signal collected from its detection area into an electrical signal; the input end of the high-impedance transconductance amplifier 206 is ...

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Abstract

The invention provides a circuit processing subsystem of a particulate matter monitoring device, and the subsystem comprises a photoelectric detection unit which is used for converting an optical signal collected from a detection region of the photoelectric detection unit into an electric signal; a high-impedance transconductance amplification unit which is used for performing signal amplification processing on the electric signal; an alternating current coupling unit which is used for carrying out background light interference suppression on the amplified electric signal and carrying out noise reduction processing on the sensing signal; a phase-locked amplification unit which is used for further carrying out noise reduction processing on the electric signal after background light interference suppression; a differential amplification unit which is used for carrying out further amplification and noise reduction processing on the signal; an analog-digital conversion unit which is used for performing analog-digital conversion on the signals; and a control unit which is used for controlling the laser modulation signal and carrying out corresponding particulate matter monitoring according to the received digital signal. According to the technical scheme, the problems that an existing dust sensor is seriously interfered by background light, noise is serious and the like, can be effectively solved, and therefore more accurate and efficient particulate matter monitoring can be achieved.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a circuit processing subsystem of a particle monitoring device. Background technique [0002] With the improvement of people's living standards, people's requirements for physical health and link safety are gradually increasing. How to effectively monitor and warn of dust pollution in the environment, such as smoke, haze, light fog, fine dust or smog, has become an extremely serious problem at present. Therefore, laser dust sensors have become an indispensable type of equipment in people's lives, especially ultra-low emission laser scattering dust sensors. [0003] However, the existing ultra-low emission laser scattering dust sensor has many shortcomings, for example: it is seriously interfered by background light, and the laboratory environment, the dark environment in the chimney, or the sunlight environment all have a great impact on the measurement data; The noise is serio...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G01N15/06
CPCG01N15/06G01N15/075
Inventor李熠豪王占锋
Owner上海北分科技股份有限公司