研究目的
To determine the temperatures of blackbody sources in the range of 1200–1570 K using a Double Monochromator System (DMS) based on a grating and a prism as dispersion elements.
研究成果
The method presented in this work allows the determination of the temperatures of blackbody sources in the range of 1200–1570 K with a relative uncertainty of the system responsivity “G ” varied from 0.3% to 1.12%. This in turn resulted in a corresponding uncertainty in temperature of about 2.2 K and 4.5 K (k = 1) over the evaluated temperature range. Although this uncertainty level was significantly high compared to those obtained by many other national metrology institutes, it was considered as a step forward in our laboratory to measure high temperatures.
研究不足
The uncertainty level was significantly high compared to those obtained by many other national metrology institutes.
1：Experimental Design and Method Selection:
The system uses a Double Monochromator System (DMS) based on a grating and a prism as dispersion elements. The detection element was a silicon photodiode (Si-MMA), over which the spectral range from 800 nm to 900 nm has been used. Between the blackbody source and the DMS was placed an optical system consists of two convergent lenses.
2：Sample Selection and Data Sources:
The blackbody source was a Lanthanum Chromite blackbody furnace CNHT at high temperatures which is equipped with a variable temperature blackbody.
3：List of Experimental Equipment and Materials:
The bench is composed mainly of a Lanthanum Chromite blackbody furnace CNHT, a Double Monochromator System (DMS), a silicon photodiode (Si-MMA), and an optical system consists of two convergent lenses.
4：Experimental Procedures and Operational Workflow:
The cavity bottom of the furnace is imaged by the spectroradiometer which consisted of convergent lenses L1 and L2 having focal distances of 4 cm and 8 cm, respectively. The flux enters the double monochromator (DMS) through the rectangular inlet slit (slit 1) with a height of 2 cm. The photodiode is used along with a current to voltage operational amplifier, which converts the light induced photocurrent to a potential difference measured across amplifier resistance.
5：Data Analysis Methods:
The system responsivity “G ” was determined by the transmission factor of the optical system and the transmission factor of the DMS and the photodiode responsivity.
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