【摘要】 本文研究了使用热敏电阻测量气流温度时所遇到的各种技术问题,并探讨了扩大测温范围的技术途径。其中,主要是筛选热敏元件,控制自热效应,精心设计测量电桥,设法提高高温区的灵敏度和精度等。根据本文原理,研制了一种小型五孔复合探针,并在压气机单级试验器上进行实测,以验证其功能和各项性能指标。更多还原

【Abstract】 A tiny 5-hole compound probe with NTC-thermister has been developed by the authors for measurement of flow parameters in the compressor. All problems encountered for the thermister to be used in measuring the flow temperature are discussed. The techniques for enlarging the temperature range measured are also considered, such as how to sift out the best thermister, how to apply a highly precise and voltage-stabilizing supply to an unbalanced bridge for transmitting an accurate millivolt signal, and how to set a limit to the self-heating power of the thermister. As a result, the temperature range is extended from 273K to 473K. The probe was tested in a single-stage compressor rig, and its function and performance were verified favorably.更多还原