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Low-power-consumption intrinsic safety type laser carbon monoxide sensing control method and system

A low-power intrinsically safe, carbon monoxide technology, applied in the field of sensors, can solve the problems of small average life, inconvenient on-site application, short calibration period, etc. The effect of small size and weight

Pending Publication Date: 2022-04-29
SHANDONG MICRO PHOTOGRAPHIC ELECTRONICS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The sensor of this principle has the following problems in practical application: 1. The calibration cycle is short, and it usually needs to be calibrated once every 15 days
2. The life of the probe is short, especially in the beam tube monitoring system, the average life is less than 1 year
3. Poor reliability, susceptible to electronic interference, water vapor, dust and false alarms
In addition, the existing carbon monoxide sensor based on QCL laser is large in size and high in power consumption, which is inconvenient for on-site application. The problem of degumming and falling off due to environmental factors such as humidity leads to poor reliability of the sensor module

Method used

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  • Low-power-consumption intrinsic safety type laser carbon monoxide sensing control method and system
  • Low-power-consumption intrinsic safety type laser carbon monoxide sensing control method and system
  • Low-power-consumption intrinsic safety type laser carbon monoxide sensing control method and system

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Effect test

Embodiment 1

[0036] In the first aspect, the present invention provides a low-power intrinsically safe laser carbon monoxide sensing control method, including:

[0037] Obtain the spectral absorption signal of carbon monoxide;

[0038] According to the obtained carbon monoxide spectral absorption signal, the calibration coefficient corresponding to each absorption peak is used to invert the carbon monoxide concentration for the working wavelength of different absorption peaks.

[0039] The acquisition of the spectral absorption signal of carbon monoxide includes using a QCL laser as the light source of the system.

[0040] The acquisition of the spectral absorption signal of carbon monoxide also includes using the absorption gas chamber to pass the light signal emitted by the laser to the detector after passing through the gas to be measured.

[0041] In the absorption gas chamber, an M-shaped optical path is formed through two rectangular prisms and two plane reflectors.

[0042] The av...

Embodiment approach

[0052] A miniaturized low-power intrinsically safe laser carbon monoxide sensor module, including a housing body, a laser, a laser current drive circuit, a laser temperature control circuit, a power conversion circuit, a microprocessor circuit, a communication circuit, a photoelectric detector, and a temperature and pressure sensor. Compensation circuit, gain control circuit, absorption air chamber, air chamber protection 12 parts.

[0053] The main body of the shell is made of 304 stainless steel, and the size is Cylindrical designs such as figure 1 As shown: 1 is the power supply communication port, which is threaded at the same time, which is convenient to connect with the sensor head; 2 is the main body of the sensor module; 3 is the gas inlet and outlet. The inner structure of the sensor and the outer housing are screwed together. There are two independent areas inside the sensor, the lower part is the gas chamber area, and the upper part is the photoelectric area. The...

Embodiment 2

[0060] In the second aspect, the present invention provides a low-power intrinsically safe laser carbon monoxide sensor control system, including:

[0061] QCL laser, as the light source of the system;

[0062] The absorption gas chamber forms an M-shaped optical path through two right-angle prisms and two plane mirrors;

[0063] Photodetector, which receives the light beam reflected by the absorption gas chamber and converts it into an electronic signal and sends it to the controller;

[0064] Among them, the controller dynamically adjusts the working absorption peak of the measured gas according to the ambient temperature, and uses the calibration coefficient corresponding to each absorption peak to invert the carbon monoxide concentration according to the working wavelength of the different absorption peaks.

[0065] It also includes a laser temperature control circuit and an ambient temperature and pressure detection circuit.

[0066] specific,

[0067] Including the fo...

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Abstract

The invention discloses a low-power-consumption intrinsic safety type laser carbon monoxide sensing control method. The method comprises the following steps: acquiring an absorption spectrum signal of carbon monoxide; and according to the obtained absorption spectrum signal of the carbon monoxide, aiming at different working absorption peaks, inverting the carbon monoxide concentration by adopting the calibration coefficient corresponding to each absorption peak. The step of acquiring the absorption spectrum signal of the carbon monoxide comprises the step of using a QCL laser as a light source of the system. The sensor has a temperature and pressure compensation function, measurement errors caused by changes of environment temperature and environment pressure are effectively prevented, and the detection precision of the sensor is improved; according to the invention, a special pulse current driving laser and a method for dynamically adjusting the temperature of the laser to different gas absorption peaks along with the environment temperature are adopted, so that the power consumption and the volume of the sensor module are greatly reduced, and the working temperature range of the sensor is effectively expanded; therefore, the sensor can be used in an actual application field.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a low-power intrinsically safe laser carbon monoxide sensing control method and system. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Carbon monoxide is a colorless, odorless, poisonous and harmful gas. The concentration of carbon monoxide gas exceeds the limit, which can poison, suffocate and endanger life at any time. At the same time, carbon monoxide gas is also an important indicator of spontaneous combustion in coal mines. Therefore, the ability to detect carbon monoxide accurately and in real time plays an important role in the safety of coal mine production. At present, carbon monoxide sensors based on the principle of electrochemical measurement are commonly used in coal mines. [0004] The sensor of this principle has the followin...

Claims

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Application Information

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IPC IPC(8): G01N21/3504
CPCG01N21/3504G01N2021/3536
Inventor 胡杰马春飞刘统玉宁雅农魏玉宾金光贤王兆伟赵丽娜
Owner SHANDONG MICRO PHOTOGRAPHIC ELECTRONICS