Turnable diode laser trace gas measurement device and method using high diffuse reflection square chamber to increase optical paths

A technology of diode laser and diode laser, which is applied in measuring devices, color/spectral characteristic measurement, material analysis through optical means, etc., can solve the problems of high price and complex structure, and achieve the advantages of convenient manufacture, small size and increased sensitivity Effect

Inactive Publication Date: 2015-04-01
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of complex structure and expensive price in the current method of increasing the gas absorption optical path in a limited space, and to provide a tunable diode laser trace gas that uses a high diffuse reflection square cavity to increase the optical path Detection device and method

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  • Turnable diode laser trace gas measurement device and method using high diffuse reflection square chamber to increase optical paths

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specific Embodiment approach 1

[0021] Specific implementation mode one: the following combination figure 1 Describe this embodiment, the tunable diode laser trace gas detection device that uses a high diffuse reflection square cavity to increase the optical path described in this embodiment, it includes a diode laser 1 and a high diffuse reflection square cavity 2, and it also includes a photomultiplier tube 3 , sawtooth wave signal generator 4, sine wave signal generator 5, mixer 6, temperature controller 7, current controller 8, data acquisition card 9, computer 10, high voltage power supply 11, incident wedge quartz lens 12 and exit wedge Quartz lens 13,

[0022] An air inlet 2-1 and an air outlet 2-2 are arranged on the side wall of the high diffuse reflection square cavity 2,

[0023] The sawtooth signal output end of the sawtooth signal generator 4 is connected to the sawtooth signal input end of the mixer 6, and the sine wave signal output end of the sine wave signal generator 5 is connected to the ...

specific Embodiment approach 2

[0027] Specific implementation mode two: the following combination figure 1 Describe this embodiment, this embodiment will further explain Embodiment 1, the high diffuse reflection square cavity 2 in this embodiment adopts black organic glass as the structural skeleton, and the inner wall surface of the high diffuse reflection square cavity 2 is uniformly sprayed with Lambertian Avian-D highly diffuse reflective paint.

[0028] The Avian-D high diffuse reflection coating is a two-component water-based ethane coating.

specific Embodiment approach 3

[0029] Embodiment 3: This embodiment will further illustrate Embodiment 1 or 2. The temperature control accuracy of the temperature controller 7 in this embodiment is 0.1°C, and the temperature control range is 8°C-60°C.

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Abstract

A turnable diode laser trace gas measurement device and method which use a high diffuse reflection square chamber to increase optical paths belong to the technical field of trace gas concentration measurement. The invention solves the problem that methods which increase gas absorption optical paths in a limited space are complex in structure and high in cost. The device comprises a diode laser and a high diffuse reflection square chamber. The device further comprises a photomultiplier tube, a sawtooth wave signal generator, a sine wave signal generator, a mixer, a temperature controller, a current controller, a data collection card, a computer, a high voltage power supply, a wedge incident quartz lens and a wedge exit quartz lens. The method demodulates an electrical signal output by the photomultiplier tube into a second harmonic signal in the computer to obtain an optical parameter OP of the concentration of a to-be-measured gas, and then compares the OP to a standard curve of a to-be-measured gas optical parameter changing with the concentration of a gas in a high diffuse reflection square chamber, to obtain the concentration of the to-be-measured gas and to achieve measurement of the content of the to-be-measured gas. The device and the method are used for trace gas measurement.

Description

technical field [0001] The invention relates to a tunable diode laser trace gas detection device and method using a high diffuse reflection square cavity to increase the optical path, and belongs to the technical field of trace gas concentration detection. Background technique [0002] The sensitive detection technology of gas concentration has important applications in many fields, such as the monitoring of industrial production waste gas, the detection of the composition and content of human exhaled gas in medical treatment, and the monitoring of air pollution gas and toxic gas content. Using the absorption characteristics of gases for specific wavelengths of light, a variety of gas absorption spectroscopy techniques have been developed, including differential absorption spectroscopy DOAS, Fourier transform spectroscopy FTIR, correlation spectroscopy COSPEC and tunable diode laser technology TDLAS, etc. TDLAS technology has high sensitivity, low detection limit, and real-t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/39
CPCG01N21/39G01N2021/399
Inventor 张治国虞佳高强李银杰张云刚
Owner HARBIN INST OF TECH
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