Surface acoustic wave transducer for detecting volatile organic pollutants

A technology of organic pollutants and surface acoustic waves, applied in the analysis of fluids using sound waves/ultrasonic waves/infrasonic waves, the use of sound waves/ultrasonic waves/infrasonic waves for material analysis, instruments, etc., can solve problems such as time-consuming, cumbersome operations, and complex analysis , to achieve the effect of convenient use and high measurement accuracy

Pending Publication Date: 2017-02-22
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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AI Technical Summary

Problems solved by technology

At present, the conventional technology for detecting and analyzing trace VOCs is gas chromatography (GC). GC-based VOCs gas detection methods have high sensitivity and good selectivity, but these methods require expensive instruments, large volumes, complex analysis, and cumbersome operations. It takes a long time and it is difficult to meet the needs o...

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  • Surface acoustic wave transducer for detecting volatile organic pollutants
  • Surface acoustic wave transducer for detecting volatile organic pollutants

Examples

Experimental program
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Embodiment 1

[0038] Place the sensor in the environment to be tested, which contains lubricating oil volatiles; the lubricating oil volatiles are adsorbed on the sensitive film; the frequency counter measures the frequency A of the voltage signal generated by the oscillating circuit, and the measurement results are transmitted to the computer; the frequency counter is used Measure the frequency B of the output signal of the interposer transducer II, and transmit the measurement result to the computer; compare the frequency A and frequency B, and obtain the types of volatile organic pollutants in the environment to be tested and the concentration of volatile organic pollutants over time. Curve.

[0039] After comparison, the midline operating frequency of the sensor drops 620Hz in 6 hours, 660Hz in 12 hours, 590Hz in 18 hours, and 1240Hz in 30 hours.

[0040] The frequency change and the mass density of adsorbed pollutants satisfy a linear relationship, that is, the calibration curve of the...

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Abstract

The invention provides a surface acoustic wave transducer for detecting volatile organic pollutants. The central working frequency of the surface acoustic wave transducer is 200MHz, a lithium niobate material is adopted as a substrate, gold is adopted as an interpolation energy transducer material, and sol-gel silicon oxide is adopted as a sensitive membrane material; the effective area of a sensitive membrane is greater than 6mm<2>, and the sensitive membrane has a favorable adsorption effect on common volatile organic pollutants; after the sensitive membrane is saturated, alcohol is adopted for flushing so as to remove surface adsorption, and the sensitive membrane can be reused. The surface acoustic wave transducer for detecting volatile organic pollutants is high in measurement precision and convenient to use.

Description

technical field [0001] The invention belongs to the field of instrument science, in particular to a surface acoustic wave sensor for detecting volatile organic pollutants. Background technique [0002] In large-scale high-power laser devices, it is inevitable to use organic products such as rubber seals and lubricating oils, which generate volatile organic compounds (Volatile organic compounds, VOCs), which in turn pollute the optical components of the laser device. Due to the high laser flux, large-scale high-power laser devices have high cleanliness requirements for all components of the system, and the level of pollutant control is directly related to the laser operating flux of the entire device, which affects the final experimental results. [0003] At present, the method of monitoring VOCs is usually to manually collect samples, and then to the laboratory for analysis. This offline measurement method is expensive. When using existing technologies to detect and analyz...

Claims

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Application Information

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IPC IPC(8): G01N29/02
CPCG01N29/022G01N2291/02408G01N2291/02809
Inventor 贾宝申吕海兵敖东弈苗心向刘昊牛龙飞程晓峰周国瑞
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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