光电测定法的出现,解决了压缩机气阀阀片在正常运行的机器中运动规律的问题。74年以来,光电测定法在低压压缩机（主要是空气压缩机）这一领域中发挥了它的效力,解决了大量问题。特别是经76年6月在山东举办的 “压缩机气阀测试与计算”短训班上得到推广之后,这一测试方法得到更加广泛的应用。然而,对于中高压及小阀腔这一领域却一直没能解决,这就给我们提出了新课题,由此,我们 The emergence of photoelectric measurement, to solve the compressor valve in the normal operation of the movement of the machine problems. For 74 years, photometry has played its part in the field of low-pressure compressors (mainly air compressors), solving a number of problems. In particular, this test method has been more widely used after being promoted in the short training class of “Compressor Valve Test and Calculation” held in Shandong in June, However, for the medium and high pressure and small valve cavity in this area has not been able to solve, which gives us a new topic, which we