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为了确保火箭液氢液氧贮箱、氢氧发动机以及其他各种结构或部件安全可靠,必须准确地了解结构或部件在低温环境下的应力大小及其分布。目前,在低温下测量结构或部件应力的唯一有效方法,仍然是采用低温应变片的电测方法,它不仅具有价格便宜,安装方便等优点,而且所用的测量仪器简单,测量精度高,便于多点自动测量及数据的自动处理。通常市售的应变片,由于它们由温度变化产生的热输出值相当大,容易造成较大的误
In order to ensure that the rocket liquid hydrogen-oxygen tank, oxyhydrogen engine and other various structures or components are safe and reliable, it is necessary to accurately understand the stress and the distribution of the structure or components under low-temperature environment. At present, the only effective method for measuring the stress of structures or components at low temperatures is still the electrical measurement method using a low-temperature strain gauge, which not only has the advantages of low cost and convenient installation, but also has the advantages of simple measurement instruments, high measurement accuracy and convenience Automatic measurement points and data processing. Strain gauges, which are usually marketed, are quite susceptible to large errors due to their considerable heat output due to temperature changes