关键词: 仪器仪表技术, 测量, 正交双光栅, 测量要素, 极限误

Abstract: An indirect measurement method based on crossing dual gratings was proposed for the accurate measurement of powder chamber volume. The characteristics of powder chamber structure were analyzed, the limit errors of measuring key points were distributed reasonably, and a measurement equipment of powder chamber volume was designed, and its measurement error was analyzed. The experimental results show that the method proposed is quite stable, accurate and efficient. Compared with the traditional methods, the diameter measurement errors are improved from ±0.028 mm to ±0.012 mm, the length measurement errors are improved from ±0.05 mm to ±0.013 mm, the relative errors of volume measurement are improved from 0.8‰ to 0.11‰. And the measuring time was less than 24.8 min/m. The method can be used to improve the precision and speed of powder chamber volume measurement effectively.

Key words: instrument and meter technique, measurement, crossing dual grating, measuring key point, limit error, powder chamber