Measurement of differential pressure by optical interferometry with multimode tunable lasers
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Journal of Engineering Science and Technology Review
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Resumo
Determining the deformation of a capacitive membrane is a well-known pressure measurement technique. A novel
technique is presented for pressure measurement based on low coherence speckle interferometry (LCSI) to optically
evaluate the deformation of a membrane submitted to a pressure differential. By processing the low spatial frequency
speckle fringe pattern through four-stepping and phase unwrapping methods the membrane contour was determined. A
tunable multimode red diode laser is the light source. A circular aluminum membrane was submitted to pressure values up
to 90 kPa resulting in a curve of the central membrane deformation as a function of the pressure. An External Cavity Diode
Laser (ECDL) was used for laser tuning thus changing the interferogram spatial frequency and the sensitivity of the
measurement process. The interferometry results were compared with those obtained experimentally by a feeler clock and
by an analytical expression. The possibility of applying this technique in quasi real-time testing is explored.
Como referenciar
SAITA, MARCELO T.; BARBOSA, EDUARDO A.; DEGASPERI, FRANCISCO T.; WETTER, NIKLAUS U. Measurement of differential pressure by optical interferometry with multimode tunable lasers. Journal of Engineering Science and Technology Review, v. 13, n. 6, p. 17-21, 2020. DOI: 10.25103/jestr.136.03. Disponível em: http://repositorio.ipen.br/handle/123456789/31992. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.