Measurement performance analysis for a charge-coupled-device-based near-infrared multi-spectral pyrometer

摘要

The handheld charge coupled device (CCD) spectrometer can detect emitted, reflected or transmitted light spectrum rapidly, and so it was widely used in the fields of scientific research and industrial applications. In this paper, based on a CCD array spectrometer, a multi-spectral pyrometer is also developed, and the dependence of the spectral radiation intensity and the analog to digital converter (ADC) counts is determined by means of a blackbody furnace. Meanwhile, the noise model of the multi-spectral pyrometer is established and the influences of the readout noise, photoelectron noise and dark noise on temperature measurement accuracy are evaluated quantitatively. Experimental results show that temperature measurement accuracy is mainly affected by the readout noise. In the temperature range from 800 degrees C to 1200 degrees C and the near-infrared region around the spectral band of 780-1030 nm, the maximum relative temperature measurement deviation caused by the readout noise is 1.79% when the exposure time is set to 9 ms. And under the same setting conditions, the maximum relative temperature measurement deviation caused by the photoelectron noise and the dark noise is 1.00% and 0.24%, respectively.