A 7.4 kHz, 20-bit image encoder with a CMOS linear image sensor
- 47 Downloads
This paper presents a unique CMOS linear image sensor for reading the pseudo-random code on the slit disc, focusing on the two aspects of low noise and readout rate. Each pixel is equipped with an exclusive integral readout circuit, and the shape of the pixel also matches the slit disc, making the output signal consistent by up to 99%. After subdivision, the absolute angle data can be captured with an angular resolution of 16 bits and a maximum speed of 7.4 kHz. In addition, decoding and subdivision methods are suitable for high-speed, inexpensive encoder systems.
KeywordsIntegrated optics Sensors Metrological instrumentation Photoelectric device
National Key Research and Development Program of China (No. 2017YFF0105303). Technology Development Plan Project of Jilin Province of China (No. 20160204064GX).
- European Machine Vision Association: EMVA Standard 1288: Standard for Characterization of Image Sensors and Cameras [EB] (2012). http://www.emva.org. October 2018
- Feng, Y.Q., Wan, Q.H., Sun, Y., et al.: High resolution interpolation techniques of small photoelectric encoder. Infrared Laser Eng. 42(7), 1825–1829 (2013)Google Scholar
- Pertiu, E.M.: Absolute-type position transducers using a pseudorandom encoding. IEEE Trans. Instrum. Meas. 36(4), 950–955 (1987)Google Scholar
- Vermeiren, J., Van Bogget, U., et al.: Low-noise, fast frame-rate In Ga As 320 × 256 FPA for hyperspectral applications. In: Conference on Infrared Technology and Applications XXXV, vol. 7298, p. 72983N. International Society for Optics and Photonics (2009)Google Scholar