Quartz crystal micro-balance trace ammonia gas detection device

A detection device, quartz crystal technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of atmospheric environment pollution, harm to workers, affecting the growth and health of animals, etc., to achieve good selectivity, improve accuracy and scope , the effect of high sensitivity

Inactive Publication Date: 2012-07-18
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In livestock and poultry production, NH in the livestock and poultry growth environment 3 The content detection is extremely important, first of all NH 3 Is an irritating gas that emits a

Method used

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  • Quartz crystal micro-balance trace ammonia gas detection device
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  • Quartz crystal micro-balance trace ammonia gas detection device

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Embodiment Construction

[0028] The quartz crystal microbalance trace ammonia detection device of the present invention comprises a sensitive QCM sensor 1 and a reference QCM sensor 9, a crystal oscillation circuit A 2 and a crystal oscillation circuit B 8 which are respectively connected to the sensitive QCM sensor and the reference QCM sensor, The frequency measuring circuit A 3 and the frequency measuring circuit B 7 connected to the signal output ends of the crystal oscillation circuit A and the crystal oscillation circuit B respectively, the difference frequency circuit 4 connected to the signal output ends of the frequency measurement circuits A and B at the same time, and the frequency difference circuit 4 for collecting the difference The data acquisition part of the frequency circuit output signal; among them, the sensitive QCM is an AT-cut 6MHz crystal oscillator coated with polyaniline film on the electrode surface; the crystal oscillator circuit is a parallel resonant circuit, and the crysta...

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Abstract

The invention discloses a quartz crystal micro-balance trace ammonia gas detection device, comprising a sensitive quartz crystal microbalance (QCM) sensor and a reference QCM sensor, which are respectively connected with a crystal oscillation circuit A and a crystal oscillation circuit B, wherein signal output ends of the crystal oscillation circuit A and the crystal oscillation circuit B are respectively connected with a frequency measurement circuit A and a frequency measurement circuit B, also connected with a personal computer (PC) machine with a built-in Labview data acquisition process program by a frequency differential circuit and a data acquisition card; and the sensitive QCM sensor is a quartz crystal oscillator coated with a sensitive coating on the surface. The sensitivity degree of the quartz crystal micro-balance trace ammonia gas detection device is high, the precision and range of the frequency measurement are increased by using the frequency measurement circuit way combining a single-chip microcomputer with a complex programmable logic device (CPLD); the sensitivity degree of the quartz crystal micro-balance trace ammonia gas detection device is less affected by environment; the selectivity is good; and the produced polyaniline film has single absorption of the ammonia gas and is less susceptible to other gas interference.

Description

[0001] technical field [0002] The invention relates to a gas concentration detection device, in particular to a device for detecting ammonia gas using a quartz crystal microbalance. [0003] Background technique [0004] In livestock and poultry production, NH in the livestock and poultry growth environment 3 The content detection is extremely important, first of all NH 3 Is an irritating gas that emits a large amount of NH 3 It will pollute the air environment and cause physical harm to the staff. Secondly, NH 3 It directly affects the growth and health of animals and the output of animal husbandry. [0005] Quartz crystal microbalance (QCM) is a sensing device based on the piezoelectric effect of quartz crystal to measure the change of its electrode surface quality. When an electric field is given to the quartz crystal, corresponding strains will appear in certain directions of the crystal, and this strain is linearly related to the electric field strength. If the...

Claims

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Application Information

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IPC IPC(8): G01N5/00
Inventor 郑守国李淼张浩东胡泽林曾新华朱泽德翁士状尤聚军高会议何绵涛
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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