The operation of a differential absorption displacement transducer based on the optical wedge principle has been successfully demonstrated. The displacement sensitivity of the transducer can be selected anywhere in the range of 0 to 10.35 dB mm -1 by the proper choice of the wavelength. The minimum value of the displacement resolution is +or-2.9 mu m and occurs for an active wavelength of 585.5 nm.
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E. Theocharous (1985) studied this question.
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