Low power control interferometric sensor with wide dynamic range

Optics: measuring and testing – By particle light scattering – With photocell detection

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G01B 902

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047521325

ABSTRACT:
A plurality of sensors are adjusted to provide coarse and fine measurements of a physical parameter such as acoustic pressure. A first interferometric sensor is adjusted to produce a 2.pi. phase shift between its sensing and reference beams for the maximum value of the parameter to be measured. A second interferometric sensor is adjusted to produce a 2.pi. phase shift for the minimum value of the parameter to be detected and to produce an integer multiple of 2.pi. for the maximum value. Power is supplied to the sensors to operate them over a predetermined dynamic range. The dynamic range of the system is the product of the dynamic ranges of the two sensors. The sensor system may include several sensors arranged to have sensitivities whose ratios form a binary sequence. Detectors produce outputs that are logic high or low depending upon whether the outputs of the sensors exceed a threshold, thus forming the bits of a digital word that indicates the value of the parameter being measured.

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