The invention discloses a photoelectric receiving sensor for an incremental displacement
measurement device. The photoelectric receiving sensor solves the problems that displacement
measurement precision is low, maintenance and debugging of finished products cannot be realized and optical signals cannot be output stably for a long term. The photoelectric receiving sensor comprises a photoelectric
detector array, a summator, subtracters and a
gain-variable amplifying circuit, wherein the photoelectric
detector array outputs
sinusoidal current signals corresponding to the optical signals, the
gain-variable amplifying circuit receives the
sinusoidal current signals, amplifies the
sinusoidal current signals and converts the sinusoidal current signals into
voltage signals, the summator sums the
voltage signals output by the
gain-variable amplifying circuit so as to obtain a direct-
current voltage signal, the subtracters convert the
voltage signals output by the gain-variable amplifying circuit into sinusoidal signals or cosine signals. The photoelectric receiving sensor adapts to multiple
light source requirements and can analyze displacement information amount precisely, influences caused by
light source nonuniformity and distribution nonuniformity of the photoelectric
detector array are obviously reduced, the optical signals can be output by a
light source stably for long term, and the photoelectric receiving sensor is adjustable in gain and simple in structure.