A new vibration measurement procedure for on-line quality control of electronic devices

Article type: Research Article

Authors: Revel, Gian Marco

Affiliations: Dipartimento di Meccanica, Università degli Studi di Ancona, via Brecce Bianche, I-60131 Ancona, Italy. Tel.: +39 071 2204441; Fax: +39 071 2204801; E-mail: [email protected]

Abstract: In this paper the problem of experimentally testing the mechanical reliability of electronic components for quality control is approached. In general, many tests are performed on electronic devices (personal computers, power supply units, lamps, etc.), according to the relevant international standards (IEC), in order to verify their resistance to shock and vibrations, but these are mainly "go no-go" experiments, performed on few samples taken from the production batches. The idea here proposed is to improve the efficiency of these tests by using electro-optic techniques for the measurement of the vibration behaviour of the components under known excitation. This would allow the on-line testing of a high percentage of the production and would be useful to give important feedback to the design process. Scanning laser Doppler vibrometry seems to be a valuable solution for this problem, thanks to its capabilities of measuring several spatially-defined points on a vibrating object with reduced testing time for on-line application, with high sensitivity and accuracy, non-intrusivity and with any kind of excitation signal. Experimental tests are performed on a power supply: the results show the effectiveness of the proposed approach. The metrological problems connected with the on-line implementation are also discussed.

Keywords: vibration measurement, quality control, electronic components, laser vibrometry

Journal: Shock and Vibration, vol. 9, no. 1-2, pp. -10, 2002