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Micro water steam concentration detection method with self-controlled measuring range

A technology for detecting concentration and water vapor. It is applied in measurement devices, color/spectral characteristic measurement, instruments, etc. It can solve the problems of limited detection simplicity, troublesome conversion, complicated circuits, etc. noisy effect

Inactive Publication Date: 2016-03-23
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, different circuit parameters must be processed for water vapor at different concentrations, which will lead to complex circuits, troublesome conversion, and easy introduction of other circuit noises, so the ease of detection is limited

Method used

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  • Micro water steam concentration detection method with self-controlled measuring range
  • Micro water steam concentration detection method with self-controlled measuring range
  • Micro water steam concentration detection method with self-controlled measuring range

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Embodiment

[0037] Such as figure 1 As shown, a method for detecting the concentration of trace water vapor with automatic range control is realized by the following measurement system, which includes single-chip microcomputers A, B, temperature control drive module 2, DFB laser 3, gas chamber 4, photodetector 5, current Voltage conversion module 6, lock-in amplifier 7, subtractor 8, gain control module 9, high-precision reference voltage generator 10 and signal acquisition module 11, temperature control drive module 2 includes a temperature control module and a drive module, and the single chip microcomputer A is connected to the drive module , the temperature control drive module is connected with the DFB laser 3, the DFB laser 3 is located in front of the gas chamber 4, the photodetector 5 is placed behind the gas chamber 4, the output end of the photodetector 5 is connected to the input end of the current-voltage conversion module 6, and the current-voltage Conversion module 6 output ...

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Abstract

The invention discloses a micro water steam concentration detection method with a self-controlled measuring range, and belongs to the field of gas sensor system detection. The system comprises a single chip microcomputer, a laser temperature controlling and driving module, a DFB laser, a gas chamber, a photoelectric detector, a current-voltage conversion module, a lock phase amplifier, a high precision reference voltage generator, a subtractor, a gain control module, and a signal collecting module. The measuring range selecting module of multipath fixed parameter of a conventional secondary harmonic method micro water steam detection system is modified to obtain the provided system; after the lock phase amplifier obtains the harmonic amplitude containing concentration information, the gain control module is used to control the harmonic gain, at the same time, through the information exchange between the gain control module and the signal collecting module, the measuring range self control can be realized; and finally the water steam concentration of a gas to be detected can be calculated according to the harmonic amplitude and the gain value. The provided method breaks the limitation of concentration measuring range on circuit detection, enlarges the detected concentration range, effectively improves the signal / noise ratio, and is beneficial for extracting gas concentration information.

Description

technical field [0001] The gas sensing system detection field of the present invention is a new method for collecting trace water vapor concentration information by using high-precision voltage reference, DC adjustment and single-chip microcomputer control at the same time. Background technique [0002] Water is an important substance for our survival, and detecting water vapor concentration is of great significance in many fields. For example, medium gas SF in UHV power transmission and transformation system equipment 6 When it contains moisture, it will generate highly toxic and corrosive chemical substances, corrode insulation equipment, and even explode. In the food processing industry, if the water content in the packaging bag exceeds the standard, it will directly affect the quality of the food. The more water content in the transformer oil, the faster the aging of the oil itself, the aging of equipment insulation and the corrosion of metal parts; The safe productio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
CPCG01N21/3103
Inventor 陈希常军魏巍刘媛媛王福鹏刘永宁
Owner SHANDONG UNIV
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