Abstract

A liquid-level sensor, consisting of three optical fibers, is described. A light is projected onto an oil surface through a transmitting fiber. A receiving fiber picks up the light reflected from the oil surface. A reference fiber transmits the light from a light-emitting diode back and forth along the same path as that of the transmitting fiber and the receiving fiber. Division is accomplished by using the reflected signal and the reference signal, so it becomes possible to eliminate apparent distance variations that are due to the variations in light intensity, which may be caused by external forces and temperature changes. The distance range is 100 mm.

© 1992 Optical Society of America

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References

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  1. R. M. A. Azzam, “Light-reflection liquid-level sensor,” IEEE Trans. Instrum. Meas. IM-29, 113–115 (1980).
    [CrossRef]
  2. J. P. Dakin, M. G. Holliday, “A liquid level sensor based on O-H or C-H absorption monitoring,” in Proceedings of the First International Conference on Optical Fibre Sensors (Institution of Electrical Engineers, London, 1983), pp. 91–95.
  3. M. Sharma, R. E. Brooks, “Fiber-optic sensing in cryogenic environments,” in Fiber Optics for Communications and Control, C. W. Kleekamp, ed., Proc. Soc. Photo-Opt. Instrum. Eng.224, 46–52 (1980).
  4. K. Spenner, M. D. Singh, H. Schulte, H. J. Boehnel, “Experimental investigations on fiber optic liquid level sensors and refractometers,” in Proceedings of the First International Conference on Optical Fibre Sensors (Institution of Electrical Engineers, London, 1983), pp. 96–99.
  5. D. A. Jackson, “High precision remote liquid level measurement using a combination of optical radar and optical fibres,” in Proceedings of the First International Conference on Optical Fibre Sensors (Institution of Electrical Engineers, London, 1983), pp. 100–103.
  6. K. Iwamoto, I. Kamata, “Pressure sensor using optical fiber,” Appl. Opt. 29, 375–378 (1990).
    [CrossRef] [PubMed]

1990

1980

R. M. A. Azzam, “Light-reflection liquid-level sensor,” IEEE Trans. Instrum. Meas. IM-29, 113–115 (1980).
[CrossRef]

Azzam, R. M. A.

R. M. A. Azzam, “Light-reflection liquid-level sensor,” IEEE Trans. Instrum. Meas. IM-29, 113–115 (1980).
[CrossRef]

Boehnel, H. J.

K. Spenner, M. D. Singh, H. Schulte, H. J. Boehnel, “Experimental investigations on fiber optic liquid level sensors and refractometers,” in Proceedings of the First International Conference on Optical Fibre Sensors (Institution of Electrical Engineers, London, 1983), pp. 96–99.

Brooks, R. E.

M. Sharma, R. E. Brooks, “Fiber-optic sensing in cryogenic environments,” in Fiber Optics for Communications and Control, C. W. Kleekamp, ed., Proc. Soc. Photo-Opt. Instrum. Eng.224, 46–52 (1980).

Dakin, J. P.

J. P. Dakin, M. G. Holliday, “A liquid level sensor based on O-H or C-H absorption monitoring,” in Proceedings of the First International Conference on Optical Fibre Sensors (Institution of Electrical Engineers, London, 1983), pp. 91–95.

Holliday, M. G.

J. P. Dakin, M. G. Holliday, “A liquid level sensor based on O-H or C-H absorption monitoring,” in Proceedings of the First International Conference on Optical Fibre Sensors (Institution of Electrical Engineers, London, 1983), pp. 91–95.

Iwamoto, K.

Jackson, D. A.

D. A. Jackson, “High precision remote liquid level measurement using a combination of optical radar and optical fibres,” in Proceedings of the First International Conference on Optical Fibre Sensors (Institution of Electrical Engineers, London, 1983), pp. 100–103.

Kamata, I.

Schulte, H.

K. Spenner, M. D. Singh, H. Schulte, H. J. Boehnel, “Experimental investigations on fiber optic liquid level sensors and refractometers,” in Proceedings of the First International Conference on Optical Fibre Sensors (Institution of Electrical Engineers, London, 1983), pp. 96–99.

Sharma, M.

M. Sharma, R. E. Brooks, “Fiber-optic sensing in cryogenic environments,” in Fiber Optics for Communications and Control, C. W. Kleekamp, ed., Proc. Soc. Photo-Opt. Instrum. Eng.224, 46–52 (1980).

Singh, M. D.

K. Spenner, M. D. Singh, H. Schulte, H. J. Boehnel, “Experimental investigations on fiber optic liquid level sensors and refractometers,” in Proceedings of the First International Conference on Optical Fibre Sensors (Institution of Electrical Engineers, London, 1983), pp. 96–99.

Spenner, K.

K. Spenner, M. D. Singh, H. Schulte, H. J. Boehnel, “Experimental investigations on fiber optic liquid level sensors and refractometers,” in Proceedings of the First International Conference on Optical Fibre Sensors (Institution of Electrical Engineers, London, 1983), pp. 96–99.

Appl. Opt.

IEEE Trans. Instrum. Meas.

R. M. A. Azzam, “Light-reflection liquid-level sensor,” IEEE Trans. Instrum. Meas. IM-29, 113–115 (1980).
[CrossRef]

Other

J. P. Dakin, M. G. Holliday, “A liquid level sensor based on O-H or C-H absorption monitoring,” in Proceedings of the First International Conference on Optical Fibre Sensors (Institution of Electrical Engineers, London, 1983), pp. 91–95.

M. Sharma, R. E. Brooks, “Fiber-optic sensing in cryogenic environments,” in Fiber Optics for Communications and Control, C. W. Kleekamp, ed., Proc. Soc. Photo-Opt. Instrum. Eng.224, 46–52 (1980).

K. Spenner, M. D. Singh, H. Schulte, H. J. Boehnel, “Experimental investigations on fiber optic liquid level sensors and refractometers,” in Proceedings of the First International Conference on Optical Fibre Sensors (Institution of Electrical Engineers, London, 1983), pp. 96–99.

D. A. Jackson, “High precision remote liquid level measurement using a combination of optical radar and optical fibres,” in Proceedings of the First International Conference on Optical Fibre Sensors (Institution of Electrical Engineers, London, 1983), pp. 100–103.

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Figures (7)

Fig. 1
Fig. 1

Liquid-level sensor diagram.

Fig. 2
Fig. 2

Connector used in the liquid-level sensor.

Fig. 3
Fig. 3

Sensor-head flange.

Fig. 4
Fig. 4

Signal processor.

Fig. 5
Fig. 5

Distance between the sensor head and the oil surface versus the reflected signal output.

Fig. 6
Fig. 6

Calibration results obtained by using the oil container (oil level gauge scale output).

Fig. 7
Fig. 7

Calibration results obtained by using the oil container (output current for the computer).

Tables (1)

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Table I Comparison between the Red and LED and the Green LED as the Light Source

Equations (3)

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log D = log 70 0 . 5 log V .
log D = X .
D = 10 x .

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