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用于室温到3000K 测量应变的新方法已研制成,并经鉴定。该装置是为短时(几秒至几分钟),由自身电阻加热的材料的高温机械性能研究测量应变而研制的,但是它具有通用性。该方法是在光学上,用数字式线性扫描摄影机跟踪试样上的两个小陶瓷胶结标记。由激光照亮标记,并通过能消除试样热幅射的窄波带(1—毫米)干涉滤波器来观察。该装置分别对不锈钢和石墨在温度高达1477K 和3000K 进行试验。使用目前的透镜装置,本应变测量系统的最大位移范围为4.24毫米,在上述高温下,其总的不准确度为4.14微米。该装置的独特特点为:(1)在跟踪范围内,对亮度级变化的敏感性显著地减少;(2)该装置为动态的,因此在加热过程及短时间均能工作;(3)结节稳定,对试验结果没有不良影响;(4)系统可靠,易于使用。
New methods for measuring strain at room temperature up to 3000K have been developed and identified. The device is developed for the measurement of strain at high temperature mechanical properties of materials heated by their own resistance for a short period of time (seconds to minutes), but it is versatile. The method is optically, using a digital linear scanning camera to track two small ceramic cemented markers on a sample. Marked by a laser and observed through a narrow band (1-mm) interference filter that eliminates thermal radiation from the sample. The device tests stainless steel and graphite at temperatures up to 1477K and 3000K, respectively. With current lens assemblies, the strain measurement system has a maximum displacement range of 4.24 mm, with a total inaccuracy of 4.14 microns at these high temperatures. The unique features of this device are: (1) significantly reduced sensitivity to changes in brightness level over the tracking range; (2) the device is dynamic and therefore capable of operating both in the heating process and for a short period of time; (3) Stable, no adverse effect on test results; (4) The system is reliable and easy to use.