Quartz crystal micro-balance trace ammonia gas detection device

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...

AI Technical Summary

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 large amount of NH 3 Pollution to the air environment and physical hazards to the staff

Secondly, NH 3 Directly affect the growth and health of animals, and affect the output of animal husbandry

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