基于虚拟仪器技术的辐射式光纤测温系统的研究(5)

燕山大学本科生毕业设计（论文）

Abstract

Since transferring and sensor technology of optical fiber has some advantages in practices, radiation temperature measuring based on optical fiber is rapidly developed. In recent years, brightness optical fiber pyrometer is widely applied. However, in some circumstances there are measurement errors caused by variation of transmitting rate, dust, vapor, and losing accuracy of detector. A system is constructed in this paper to diminish the errors above in order to enhance temperature-measuring accuracy.

Optical fiber radiation pyrometer is intensively investigated. Based on the principle of blackbody radiation and by using double-wavelength approach, wavelet filter is adopted for denoising to obtain higher temperature-measuring accuracy.

The performance and construction of each component of the pyrometer are depicted in details. To take into account temperature measuring range, sensitivity, relative sensitivity, linearity and spectrum response of detector, the selection of wavelength of two waves is thoroughly studied and selecting area of parameters is determined by numerical calculation. Filter rotary device is designed for

colorimetric system of double photoelectric detector and temperature-measuring experiment is conducted. The colorimetry (double wavelength method) can largely lower the blast-off rate which influence the result of temperature

measurement. Under the best term, the influence can decline to the zero.

Keywords radiation temperature measuring; optical fiber radiation pyrometer; principle of blackbody radiation; double wavelength method; filter rotary device

III

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