Reflectivity Compensation And Linearization Of Fiber Optic Proximity Probe Response

Hull-Allen, G.

doi:10.1117/12.945182

Cited by 9 publications

(3 citation statements)

References 4 publications

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“…A fundamental limitation in the application of this type of sensor is its sensitivity to target reflectivity. Compensation methods using two groups of receiving fibre to reduce the effect of light intensity variation have also been reported in [4][5][6][7][8][9][10][11]. Compensation methods are based on the ratio of the outputs of two photodetectors following the two groups of receiving fibre [5][6][7][8][9][10] or on the ratio of the differential signal to the sum signal of two photodetectors [4,11].…”

Section: Introductionmentioning

confidence: 99%

“…Compensation methods using two groups of receiving fibre to reduce the effect of light intensity variation have also been reported in [4][5][6][7][8][9][10][11]. Compensation methods are based on the ratio of the outputs of two photodetectors following the two groups of receiving fibre [5][6][7][8][9][10] or on the ratio of the differential signal to the sum signal of two photodetectors [4,11]. However, dynamic displacement measurement was not reported in [4,[6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…Compensation methods are based on the ratio of the outputs of two photodetectors following the two groups of receiving fibre [5][6][7][8][9][10] or on the ratio of the differential signal to the sum signal of two photodetectors [4,11]. However, dynamic displacement measurement was not reported in [4,[6][7][8][9][10][11]. In [5], compensation is made by placing the probe at a position where a group of receiving fibres (group A or B) is of peak response.…”

Section: Introductionmentioning

confidence: 99%

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Reflectivity and illuminating power compensation for optical fibre vibrometer

Li¹,

Nakamura²,

Ueha³

2004

Meas. Sci. Technol.

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In this paper, a simple and inexpensive optical fibre vibrometer with reflectivity and illuminating power compensation is presented. It consists of a light emitting diode, an optical fibre probe and two photodetectors. The bundling of the probe is divided into three parts: an illuminating fibre, the first-neighbour receiving fibres (group A) and the second-neighbour receiving fibres (group B). The ratio of mean values of the output signal from group A to that from group B is dependent on the mean distance between the probe and target surface, and is independent of the reflectivity of the target surface and illuminating power. By using this ratio, the mean distance between the probe and target surface is estimated. Then based on the calibration curve of group A or B, compensation of sensitivity is made. Because mean values of the photodetector outputs are used in ratio calculation, an increase in vibration frequency does not limit the application of this ratio technique. For this reason, this method is suitable for dynamic measurement. Results of experiments show that this optical fibre vibrometer is capable of compensating for target surface reflectivity, illuminating power and the mean distance between the probe and target surface.

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