Method And Apparatus For Position Error Measurement of Optical Rotary Encoders
Publication Date: 2003-Sep-11
The IP.com Prior Art Database
By feeding the digital encoder output signal into a frequency to voltage converter coupled to a dynamic signal analyzer, one can record the spectral frequency at the "once around" interval of the encoder at a known driven speed. The voltage value read at this frequency can then be converted mathematically to velocity error, then to displacement error at the driven roll surface. This displacement error can then be converted to an arc minute value by knowing the physical dimension of the driven roll.