外文翻譯--一種新型的測(cè)量地?zé)岬陌雽?dǎo)體溫度計(jì)(已修改)
2025-06-01 08:20 本頁(yè)面
【正文】 本科生畢業(yè)設(shè)計(jì)（論文）外文翻譯 題目： A new Semiconductor Thermometer for Geothermal Measurements 學(xué) 院： 信息科學(xué)與工程學(xué)院 專(zhuān)業(yè)班級(jí)： 電信 1002 班 學(xué)生姓名： 指導(dǎo)教師： 2020 年 3 月 16 日 A new Semiconductor Thermometer for Geothermal Measurements By SATYABRATA DATTA1 ) Summary :A portable solid state device designed and constructed for the measurement of temperature variation with depth inside a borehole is described. Saturation current (which is highly dependent on ambient temperature) in a reverse biased PN junction has been utilised for the purpose of measurement. The equipment is inexpensive and possesses several advantages over other types of instruments for geothermal measurement regarding simplicity in construction and operation. 1. Introduction Usually, thermistors are utilised as temperature pickup element in borehole geothermal measurements [1]2 ) . This is chiefly because thermistors have high negative temperature coefficient of resistance. In the method of measurement with thermistor, a resistance bridge is used in association with an oscillator [2] or a . [3] voltage source. A thermistor with the cable forms one arm of the bridge. Outofbalance volt age due to change in thermistor resistance caused by temperature variations is noted after amplification when the thermistor with the cable is lowered in the borehole. The temperature under measurement is then found from a calibration chart or curve showing unbalance voltage versus temperature previously constructed in the laboratory under controlled conditions. Sources of error in this method of measurement are largely due to drift in the thermistor and amplifier characteristics, and also due to undesirable changes in cable and other bridge arm resistances. The design and construction of the equipment described in this paper was under taken for the use of a glacier expedition party of the Geological Survey of India to study temperature variations with depth inside boreholes in glacier. Obviously, the equipment to suit the purpose should be light and simple in construction, and its performance should not be susceptible to adverse surface climatic variations likely to be encountered. 2. Description The working principle of the instrument is as follows: The current (I) flowing through a PN junction is given by the relation I ≈ i0 (e V/VT 1), (1) 1) Geophysics Division, Geological Survey of In
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