In this paper a new method of measuring instantaneous swept volume of reciprocating machines/compressors is discussed. The device proposed is suitable for industrial facilities involving multiple reciprocating machines/compressors. A cam, whose profile simulates, swept volume as a function of crank angle is fabricated and fitted on the crankshaft of the reciprocating machine/compressor. The swept volume is calculated by measuring the profile of the cam, which rotates in unison with the crankshaft, using a dynamic noncontact type laser displacement sensor. The laser displacement sensor provides voltage output proportional to the cam profile, which in turn is proportional to the swept volume. This voltage output can be given to any analyzer as swept volume signal for further processing. An experimental setup is created to validate the measurements obtained by this method by comparing with measurements performed with a crank angle encoder. Error sources that arise in the cam device are identified and discussed.
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