Low-power-consumption NDIR gas sensor

A gas sensor and low power consumption technology, applied in the field of sensors, can solve the problems of large output fluctuations of the whole machine, sufficient output of infrared detectors, and reduced average power consumption, so as to reduce power consumption for preheating, suppress baseline shaking, Make up for the effect of signal attenuation

Pending Publication Date: 2022-08-05
苏州谱融传感科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the power consumption of the infrared light source is large, the NDIR gas sensor does work with a certain duty cycle mode cycle, which reduces the average power consumption of the whole machine. Although adjusting the duty cycle is conducive to optimizing the power consumption parameters, but Limited by the sensitivity and noise characteristics of the infrared detector, it is difficult to make the infrared detector output a large enough signal if the working time of the light source is too short. Excessive adjustment of the magnification of the analog signal circuit will cause the output fluctuation of the whole machine to increase

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Examples

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Embodiment 1

[0051] A low power NDIR gas sensor is provided in this example, see figure 2 , 3 shown, including: infrared light source 2, optical cavity 1, pyroelectric infrared detector 3, signal processing circuit, timing wake-up circuit, microcontroller, analog circuit power supply circuit, digital circuit power supply circuit, light source power supply circuit, enabling circuit, Sensor power supply interface, enable interface, sensor output interface.

[0052] Optical cavity 1: A hollow tubular opposite-beam optical cavity 1 made of aluminum alloy, the interior of the cavity is polished, the infrared light source 2 is fixed at one end of the cavity, and the pyroelectric infrared detector 3 is fixed at the other end, see figure 1 As shown, the inner diameter of the cavity is 6mm, the distance between the incident window of the pyroelectric infrared detector 3 and the center of the infrared light source 2 is 27mm, and the side wall of the optical cavity 1 has 5 ventilation holes with a ...

Embodiment 2

[0074] The present invention provides a low power consumption NDIR gas sensor, the technical scheme is as follows, refer to Figure 4 , 5 shown:

[0075] Including: infrared light source 2, optical cavity 1, pyroelectric infrared detector 3, signal processing circuit, single chip microcomputer, analog circuit power supply circuit, digital circuit power supply circuit, light source power supply circuit, sensor power supply interface, sensor output interface.

[0076] Infrared light source 2: MEMS light source, 2.5V power supply, working current 50mA, TO39 tube socket, with a concentrator cup, and a 1mm thick barium fluoride crystal window is installed on the top of the condenser cup.

[0077] Pyroelectric infrared detector 3: The difference between the pyroelectric infrared detector 3 used in this example and the pyroelectric infrared detector 3 in Example 1 is that the two window filters used in this example are Sheets 6 are respectively 10.6 microns and 3.95 microns in the ...

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Abstract

The invention discloses a low-power-consumption NDIR gas sensor which comprises an infrared light source, an optical cavity, a pyroelectric infrared detector, a signal processing circuit, a single chip microcomputer, an analog circuit power supply circuit, a digital circuit power supply circuit, a light source power supply circuit, a sensor power supply interface and a sensor output interface. The interior of the pyroelectric infrared detector is of a dual-channel compensation structure, the absolute value of the difference between the capacitance values of a sensitive piece and a compensation piece is smaller than 5%, the power consumption of the pyroelectric infrared detector is smaller than 200 microamperes, and the power-on stabilization time is smaller than 10 seconds; the power consumption of the signal processing circuit is less than 200 microamperes. According to the NDIR gas sensor, the low-power-consumption architecture of the NDIR gas sensor is jointly realized through pre-heating of the high-precision pyroelectric infrared detector, timing delay awakening of the single chip microcomputer, ultra-short-time flickering of the light source and independent power supply of all the components.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a low power consumption NDIR gas sensor. Background technique [0002] Compared with electrochemical and semiconductor principles, NDIR gas sensors have the advantages of long life, anti-poisoning, and anti-interference. Parameters, the electronic part of the traditional NDIR gas sensor is composed of infrared light source, infrared detector, analog signal circuit, digital circuit and so on. Infrared detectors can choose passive thermopile or active pyroelectric, and the power consumption can be controlled within a few hundred microamps. The analog signal circuit used to amplify and filter the output signal of the infrared detector, usually the power consumption can also be controlled within tens to hundreds of microamps. For the thermopile detector, a zero-drift op amp needs to be used to build the signal circuit. milliamp level. Digital circuits such as microcontrollers can ...

Claims

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Application Information

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IPC IPC(8): G01N21/3504G01N21/01
CPCG01N21/3504G01N21/01G01N2021/0112
Inventor方聪刘源汪尧威焦耀武赵伟刚
Owner苏州谱融传感科技有限公司