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Portable field formaldehyde detector design

Author: DuJuan
Tutor: ZhaoYuanLi
School: Zhengzhou University
Course: Measuring Technology and Instruments
Keywords: Formaldehyde Spectrophotometry Site testing
CLC: TH83
Type: Master's thesis
Year: 2010
Downloads: 404
Quote: 0
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Abstract


Furniture and other interior decoration materials and the release of formaldehyde in indoor air is the main pollutant, seriously affecting people's health. Currently formaldehyde detection method based chemical analysis laboratory, the disadvantage is the detection cycle is long and inconvenient operation, equipment, bulky, expensive and so on. Formaldehyde detector main site electrochemical sensor detection principle, detection accuracy is not high, vulnerability to environmental impacts. The topic for the deficiency of traditional detection of formaldehyde and the current domestic market demand, the design of a high precision, low cost, to achieve on-site detection of formaldehyde analyzer. This study is the detection of formaldehyde in indoor air concentrations of various principles and methods of operation, site-specific detector features, according to the phenol-formaldehyde reagent spectrophotometric detection principle, a light-emitting diode with a given wavelength and the corresponding photoelectric detection circuit instead of the laboratory complex optical system design, manipulation in the design of constant gas sampling module and analysis module into one, for field testing. This thesis is based on spectrophotometric detection reagent phenol formaldehyde detector principle design system architecture. Hardware circuit modular design, the optical detection module, constant gas sampling module, A / D conversion module, interactive modules and single-chip peripheral circuit module and other components, which focuses on the design of the optical detection module with constant gas sampling module . This paper discusses in detail the basic principles and structure of the photodetector, compared with selected pieces photodetector integrated operational amplifiers, studied and designed for the optical detection of formaldehyde detector preamplifier circuit. System software modular design. Designed data acquisition and storage routines, constant gas sampling subroutine, human-computer interaction and data processing subroutine subprogram. In constant gas sampling subroutine fuzzy PID algorithm to control the vacuum pump to improve the gas sampling accuracy. Upon completion of the instrument hardware and software design, based on this paper focuses on the formaldehyde content of correspondence between the photoelectric conversion data curve fitting method to analyze the method of least squares and interpolation algorithm structure and application characteristics. According formaldehyde content and the linear relationship between absorbance choose piecewise linear interpolation, the interpolation method for defect optimize its fuzzy mathematics, namely fuzzy interpolation method, while ensuring accuracy while reducing calibration points, simplifying online calibration operation.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Component analysis instrument
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