The application analyses for primary spectrum pyrometer

Abstract

In the applications of primary spectrum pyrometry, based on the dynamic range and the minimum sensibility of the sensor, the application issues, such as the measurement range and the measurement partition, were investigated through theoretical analyses. For a developed primary spectrum pyrometer, the theoretical predictions of measurement range and the distributions of measurement partition were presented through numerical simulations. And the measurement experiments of high-temperature blackbody and standard temperature lamp were processed to further verify the above theoretical analyses and numerical results. Therefore the research in the paper provides the helpful supports for the applications of primary spectrum pyrometer and other radiation pyrometers.primary spectrum pyrometry, radiation temperature measurement, temperature, emissivity, measurement range, measurement partition The principle of primary spectrum pyrometryPlanck Law is the fundamental of radiation temperature measurements, which indicates the quantitative relationship between the radiation intensity and the temperature of ideal blackbody [1] . In the study of radiation pyrometry theories and technologies, the complexity and uncertainty of actual object spectrum emissivity and the calibration problem caused by the temperature field measurement are always the key obstacles for accurate temperature measurement. Thus many radiation pyrometry methods and technologies arose [2][3][4][5][6][7][8][9][10][11][12][13] . However, our preliminary study put forward the primary spectrum pyrometry [14][15][16] based on the waveband measurement, the emissivity model in the narrow waveband and the normalization processing, and realized the true temperature field measurement without the calibrations of emissivity and spatial geometry. In applications, primary spectrum pyrometry is only applicable for those objects with continuous radiation features and the

Plasma diagnostic approach for high rate nanocrystalline Si synthesis in RF/UHF hybrid plasmas using a PECVD process

“…Depending on the degree of excitation [17], which refers to the number of energy levels the bound electron has been promoted, the molecule will dissociate into different products [18,19]. Table 1 provides some of the excitation and dissociative reactions using electron impact on silane and hydrogen molecules in order of decreasing energy [20][21][22][23][24][25][26][27][28][29] for ease of understanding.…”

The set-up of a vision pyrometer

“…where (λ) is the basis function vector with respect to the wavelength parameter, γ (T ) is the vector of the coefficients with respect to the temperature parameter and Q is the vector dimensions. In the investigated visible spectrum (380-780 nm), the experimental emissivity curves of most of the real objects, including metals and non-metals, monotonically vary with the increase of the wavelength [9][10][11]. That is, the twoparameter linear emissivity model is feasible and sufficient in some specific cases, namely…”

The theoretical prediction analyses of the measurement range for multi-band pyrometry

“…The emissivity parameter m represents the specific radiation characteristics of some surface. The physical and experimental applicability of the above emissivity model is described in the literature [12,13]. This emissivity model is only fit for some metals and nonmetals with high temperature in a narrow waveband, for example, molten steel, tungsten, etc.…”