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Oxygen concentration detecting instrument

A technology of oxygen concentration and detector, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of temperature change sensitivity and high cost of single-mode diode laser, and achieve the effect of improving stability, reducing stability requirements, and low price

Inactive Publication Date: 2009-08-12
HARBIN INST OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of high cost of using single-mode diode lasers and sensitivity of output wavelength to temperature changes in existing oxygen measuring instruments based on spectrum technology, and provides an oxygen concentration detector using tunable multi-mode diode lasers, which Use oxygen in the air as a reference gas to detect the concentration of oxygen

Method used

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  • Oxygen concentration detecting instrument

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specific Embodiment approach 1

[0009] Specific implementation mode one: the following combination figure 1 Describe this embodiment, this embodiment consists of a signal generator 1, a driver 2, a tunable multimode diode laser 3, a collimator lens 4, a beam splitter 5, a sample cell 6, a first focusing lens 7, and a first photodetector 8 , mirror group 9, second focusing lens 10, second photodetector 11, A / D converter 12 and computer 13, an output end of signal generator 1 is connected to the input end of driver 2, and the output end of driver 2 Connect the input end of the tunable multimode diode laser 3, the output light of the tunable multimode diode laser 3 is incident into the collimator lens 4, and is transmitted through the collimator lens 4 to obtain parallel light, and the parallel light is divided into transmission by the beam splitter 5 Light and reflected light, the transmitted light enters the first focusing lens 7 after passing through the sample cell 6, and is incident on the optical signal i...

specific Embodiment approach 2

[0012] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the reflector group 9 is composed of a plurality of reflectors, and the light incident on the reflector group 9 is incident on the second reflector after being reflected by each reflector. Focusing lens 10. Other composition and connection methods are the same as those in Embodiment 1.

[0013] The function of the mirror group 9 is to allow the reference light to pass through a longer absorption path in a limited space, so as to improve the signal-to-noise ratio of the reference signal, thereby improving the measurement accuracy.

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Abstract

The invention discloses an oxygen concentration detector, which belongs to the technical field of gas concentration detection. The invention aims to solve the problems that the prior oxygen detector based on spectrum technology has high cost due to using a single-mode diode laser and the output wavelength is sensitive to temperature change. An output end of a signal generator of the oxygen concentration detector is connected with an input end of a drive unit; an output end of the drive is connected with an input end of a tunable multimode diode laser; output light of the tunable multimode diode laser is transmitted by a collimating lens to form parallel light; the parallel light is split into transmitted light and reflected light through a spectroscope; the transmitted light passes through a sample cell, then is incident onto a first focusing lens for focusing and then incident onto a first photoelectric detector; the reflected light is taken as reference light and is incident onto a second photoelectric detector at last; two paths of light signals are converted into electric signals and then are input into a computer through an A / D converter; medium in the sample cell is oxygen to be tested; and the central wavelength of the tunable multimode diode laser is 760nm. The oxygen concentration detector is used for monitoring oxygen concentration.

Description

technical field [0001] The invention relates to an oxygen concentration detector and belongs to the technical field of gas concentration detection. Background technique [0002] Accurate and low-cost measurement of oxygen concentration is of great significance in the fields of environmental monitoring, biomedicine and industrial energy saving. For different specific application objects, people have developed various types of oxygen measuring instruments. The measurement principles are mainly based on solid-state electrolysis, paramagnetic method, electrochemical cell method, and chemiluminescence method. However, the above-mentioned technologies are all contact measurements, which are prone to poisoning of the detection device in industrial applications, and the sensing probe is susceptible to corrosion, which affects the service life of the instrument. Frequent calibration is required during use to ensure the accuracy of the measurement. . [0003] In contrast, the oxygen...

Claims

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Application Information

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IPC IPC(8): G01N21/39
Inventor 张治国娄秀涛高宝烈·萨姆斯菲林陈斌
Owner HARBIN INST OF TECH
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