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为了获得有足够对比度的莫尔条纹图象,需对一次位置变换器的光栅工作间隙 q 加以限制,使 q<(q_1=ω/S,q_2=ω~2/(2λ))。式中:ω——光栅节距;S——幅角;λ——接收器的灵敏度最大时的光波长。在变换器为传统结构的情况下,当使用白炽灯作为光源时,工作间隙应最小。但是,采用角散射小的高准直单色辐射来作光栅的照明,以及对第一块光栅
In order to obtain a Moiré fringe pattern with sufficient contrast, the grating working gap q of a position transducer needs to be limited so that q <(q_1 = ω / S, q_2 = ω ~ 2 / (2λ)). Where: ω - grating pitch; S - angle; λ - maximum receiver wavelength of light when the sensitivity. In the case of a conventional structure of the converter, the working clearance should be minimized when using an incandescent lamp as a light source. However, the use of small angular collimation monochromatic radiation for the grating light illumination, as well as the first grating