A simplified open photoacoustic cell in which a ring-shaped piezoelectric crystal is glued to the flat side of a sapphire is described. Some spectroscopic measurements on human whole blood are presented, with the cell in a conventional mounting and with the cell mounted on a fire optic cable. The sensitivity of the simplified cell is about three times that of the previous open cells. Some applications of the simplified open cell are discussed.
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D H McQueen (1983) studied this question.
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