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A carbon monoxide concentration detection device and detection method

A carbon monoxide and detection device technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve problems such as difficult to complete the normalization processing of absorption signal and light intensity, reduce the detection accuracy of carbon monoxide concentration, and reduce the detection accuracy of gas concentration. Effects of DC component, suppression of additional noise, and elimination of influence

Active Publication Date: 2020-04-17
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the automatic balance detection technology cannot obtain the light intensity signal, and it is difficult to complete the normalization processing of the absorption signal and the light intensity, which reduces the detection accuracy of the gas concentration
Especially when the measurement environment is an open area, due to environmental factors such as dust, fog, and haze in the environment, there will be large fluctuations in the light intensity signal, which will further reduce the detection accuracy of the carbon monoxide concentration

Method used

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  • A carbon monoxide concentration detection device and detection method
  • A carbon monoxide concentration detection device and detection method
  • A carbon monoxide concentration detection device and detection method

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Such as figure 1 As shown, a detection device for carbon monoxide concentration, the detection device uses a laser 1 as a detection light source, and the laser 1 emits a near-infrared beam whose wavelength is periodically and continuously scanned within a set wavelength range; the first beam splitter 2 will The near-infrared beam is divided into a calibration beam and a detection beam;

[0052] The collimated calibration beam is collimated by the calibration light collimator 3 to obtain a collimated calibration beam, and the collimated calibration beam passes through the calibration absorption cell 4 and then irradiates the calibration light photodetector 5 for photoelectric conversion to obtain a calibration electrical signal, The calibration light photodetector 5 sends the calibration electrical signal to the processor 6, wherein the calibration absorption cell 4 is sealed with carbon monoxide gas whose concentration is known under standard atmospheric pressure;

[0...

Embodiment 2

[0064] Such as figure 2 Shown, a kind of detection method of carbon monoxide concentration, described detection method is used for the detection device described in embodiment 1, and described detection method comprises:

[0065] Step 201: Obtain a calibration electrical signal, a reference electrical signal and a differential signal.

[0066] Step 202: Perform discrete data acquisition on the calibration electrical signal, the reference electrical signal, and the differential signal, respectively, to obtain a discrete calibration signal corresponding to the calibration electrical signal, and a discrete reference signal corresponding to the reference electrical signal. signal, and a discrete differential signal corresponding to the differential signal.

[0067] Step 203: Fitting the data in the background spectral region without carbon monoxide absorption in the spectrum diagram of the discrete differential signal to obtain the background signal of the differential signal. ...

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Abstract

The invention discloses a detection device and a detection method for carbon monoxide concentration. In the detection device, a first beam splitter splits a light beam emitted by a light source into acalibration light beam and a detection light beam; the calibration light beam is irradiated to a photoelectric detector after passing through a collimator and a calibrated absorption cell to obtain acalibrated electrical signal; a second beam splitter splits the detection light beam into a reference light beam and a measurement light beam; the reference light beam is irradiated to the photoelectric detector after passing through the collimator to obtain a reference electrical signal; the measurement light beam is emitted from the center of a Fresnel lens after passing through the collimatorand is irradiated to a reflecting end after passing through a to-be-detected area, and the reflecting end reflects the light beam to the photoelectric detector from an original path to obtain a measurement electrical signal; a differential amplifier performs differential operation on the reference electrical signal and the measurement electrical signal to obtain a differential signal; a processordetermines the carbon monoxide concentration in the to-be-detected area according to the calibration electrical signal, the reference electrical signal and the differential signal. The detection device and the detection method disclosed by the invention can improve the detection accuracy of laser spectrum measurement of the carbon monoxide concentration in an open area.

Description

technical field [0001] The invention relates to the field of online laser detection, in particular to a carbon monoxide concentration detection device and detection method. Background technique [0002] CO is a common flammable, explosive, and toxic process gas in chemical, metallurgical and other industries. Environmental CO concentration monitoring technology can provide a reliable basis for early warning of gas leakage in hazardous areas. The optical detection method has outstanding advantages such as non-contact measurement, high sensitivity, and long life. By combining with long optical path technology, it can realize the complete coverage of regional safety monitoring, which is an important direction for the development of industrial safety monitoring technology. [0003] Infrared semiconductor laser spectrum detection technology is based on the fingerprint absorption characteristics of gas molecules on the infrared spectrum, and uses the characteristic spectral absorp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/3504G01N21/359
CPCG01N21/3504G01N21/359
Inventor 张玉钧陈东尤坤何莹唐七星刘国华鲁一冰范博强刘建国刘文清
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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