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DOI: 10.1615/ICHMT.2000.TherSieProcVol2.390
113 pages

Mihajlo Firak
Faculty of Mechanical Engineering and Naval Architecture University of Zagreb, Lucica 5 10000 Zagreb, Croatia

Drazen Radosevic
Research Institute, PLIVA d.d., Ulica grada Vukovara 49, 10000 Zagreb, Croatia


The paper presents the prototype of the membrane pressure gauge with optoelectronic conversion. The main parts of the system are polished metal membrane of the 8 mm diameter, plastic 3 m long optical fibres, and the box containing optoelectronic components (laser diode module, photodetectors and op. amps. Pressure changes causing membrane displacement modulate the laser beam conducted by incoming optical fibre. Modulated and reflected beam is conducted through two outgoing optical fibres to the optoelectronic assembly where it is converted into voltage proportional; to the pressure using devising scheme. The importance of the fiber ends arrangements above the membrane plane as well as its compatibility with all electronic parts has been recognized. By changing the environmental temperature for 20 s up to approximately 350 K the laser diode has been pointed out as, by far, the most responsible electronic part for output signal deviation. The calibration characteristics using reference manometer in the range from 5 to 15.5 MPa was recorded.

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