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本文讨论了适合快速测量的中短程红外测距仪中抑制乘长误差的根本措施及减小测相误差的重要途经——用温度补偿法提高振荡器的频率稳定度的必要性和可能性;设计了一种新的补偿电路,对国产 AT 切型15MH_z 普通高频晶体的温度补偿作了初步尝试。经理论计算和实验表明,补偿后的频率稳定度达到了1×10~(-6),可使测距仪与此有关的精度指标达到国外同类产品的较好水平。
In this paper, we discuss the fundamental measures to suppress the long error of long and short range infrared range finder, and the important ways to reduce the phase error. The necessity and possibility of using the temperature compensation method to improve the frequency stability of the oscillator. A new compensation circuit is designed and a preliminary attempt is made to compensate the temperature of 15MHz high frequency crystal produced in China. Theoretical calculations and experiments show that the frequency stability after compensation reaches 1 × 10 -6, which can make the accuracy index of the range finder reach the better level of similar foreign products.