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目前,在激光干涉仪中对干涉条纹经光电转换后进行细分时,首先要求接收转换后的电讯应号为两路相位差是π/2的讯号源。这是因为倍频电路的设计参数是以初始两路电小号的幅度相等、频率相同而相位差是π/2为前提进行计算的。所以实际的初始讯号参数与假定的前提条件相接近的程度就决定着倍频结合的均匀度,从而影响测量的精度。随着倍频数的提高,对两讯号的π/2相移的精度要求越来越高。譬如,在激光干涉仪上作三十二倍频细分时,要求初
At present, when the interference fringes are subdivided by the photoelectric conversion in the laser interferometer, it is first required to receive the converted telecommunication response signal as a signal source with two phase differences of π / 2. This is because the design parameters of the frequency multiplier circuit are calculated on the premise that the initial two-way power satellites have the same amplitude, the same frequency and the phase difference is π / 2. Therefore, the actual initial signal parameters and the assumed preconditions close to determine the degree of uniformity of the frequency multiplication, thus affecting the measurement accuracy. With the increase of multiplication frequency, the accuracy of π / 2 phase shift of two signals is getting higher and higher. For example, in the laser interferometer thirty-two frequency subdivision, the request of the beginning