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Vol. 160, Issue 12, December 2013, pp. 68-73




Design on LVDT Displacement Sensor Based on AD598
Ran LIU, Hui BU

North China University of Water Resources and Electric Power, 450045, China
Tel.: 0086-371-65790037, fax: 0086-371-65790037
E-mail: zzliuran@sohu.com


Received: 8 October 2013   /Accepted: 22 November 2013   /Published: 30 December 2013

Digital Sensors and Sensor Sysstems


Abstract: Linear variable differential transformer (LVDT) is suitable for small displacement measurement. However, the excessive discrete components of traditional differential rectification circuit and phase-sensitive detection circuit make measurement result with big error and poor reliability. Special integrated-circuit chip (ASIC) AD598 has greatly simplified LVDT excitation circuit and signal conditioning circuit. AD598 can provide adjustable excitation power supply for primary LVDT winding and regularize the output voltage of secondary winding through external resistor and capacitance. Thus, direct current (DC) voltage proportional to displacement is outputted. Results show that displacement sensor sensitivity is S=834.1 mV/mm, and nonlinear error is = 0.27 %. Small displacement measurement is implemented, and measurement system is small in size and high in integration.


Keywords: Displacement sensor, LVDT, AD598.


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