We present a simple and inexpensive fiberoptic displacement sensor based on the inverse-square attenuation of light reflected from a diffuse surface. A ratio scheme provides immunity from variations in surface color and finish. A design method for determining sensor parameters is provided, and experimental results for a prototype sensor are discussed.

1.
D.
Campbell
, “
Ultrasonic Noncontact Dimensional Measurement
”,
Sensors
3
(
7
)
37
43
(
1986
).
2.
A. K.
Bejczy
, “Smart Sensors for Smart Hands”,
Paper 78-1714, AIAAINASA Conference on “Smart” Sensors
,
Hampton, VA
,
Nov. 14-16, 1978
.
3.
D. E. N.
Davies
,
J.
Chaimowicz
,
G.
Economou
, and
J.
Foley
, “
Displacement Sensor Using a Compensated Fiber Link
”, in
R.
Kersten
and
R.
Kist
, eds.,
Second Intl. Conf. on Optical Fiber Sensors
(
1984
), pp.
387
390
.
4.
C. M.
Davis
, “Fiber Optic Sensors: an Overview”, in
Fiber Optic and Laser Sensors II
(Proc. of SPIE Vol. 478,
Bellingham, WA
,
1984
), pp.
12
18
.
5.
G.
Hull-Allen
, “Reflectivity Compensation and Linearization of Fiber Optic Probe Response” in
Optical Systems Engineering N
(Proc. of SPIE vol. 518,
Bellingham, WA
,
1984
), pp.
81
85
.
6.
L.
Hoogenboom
,
G.
Hull-Allen
, and
S.
Wang
, “Theoretical and Experimental Analysis of a Fiber Optic Proximity Probe”. in
Fiber Optic and Laser Sensors II
(Proc. of SPIE vol. 478,
Bellingham, WA
,
1984
), pp.
46
57
.
7.
N. E.
Lewis
,
M. B.
Miller
,
W. H.
Lewis
, “Fiber Optic Sensors Utilizing Surface Reflections”, in
Fiber Optic and Laser Sensors II
(Proc of SPIE vol. 478,
Bellingham, WA
,
1984
), pp.
39
45
.
8.
J. T.
Luxon
and
D. E.
Parker
,
Industrial Lasers and Their Applications
(
Prentice-Hall
,
Englewood Cliffs, NJ
,
1985
), pp.
154
157
.
9.
M.
Fuhrman
and
T.
Kanade
, “
Design of an Optical Proximity Sensor Using Multiple Cones of Light for Measuring Surface Shape
”,
Opi Eng.
23
(
5
)
546
553
(
1984
).
10.
Anon.
Optical Systems Featured
”,
Sensor Review
5
(
3
)
172
174
(
1985
).
11.
Atul
Jain
, “
System for Relative Motion Detection Between Wave Transmitter-Receiver and Irregular Reflecting Surface
”, US Patent no. 4,210,399, Jan. 10, 1977.
12.
A.
Hayashi
and
Y.
Kitagawa
, “
High-Resolution Rotation-Angle Measurement of a Cylinder Using Speckle Displacement Detection
”,
Appl. Opt.
22
(
22
)
3520
3525
(
1983
).
13.
N.
Takai
and
T.
Asakura
, “
Displacement Measurement of Speckles Using a 2-D Level Crossing Technique
”,
Appl. Opt.
22
(
22
)
3514
3519
(
1983
).
14.
Anon.
, “
Distance Sensing Uses Automatic Focusing Technology
”,
Sensor Review
4
(
4
)
172
173
(
1984
).
15.
G.
Kychakoff
,
P. H.
Paul
, and
R. K.
Hanson
, “Fiber-Optic Sensor System for Industrial Monitoring Applications”, in
Technical Digest of the Conference on Lasers and Electrooptics
(
Optical Society of America
,
Washington DC
,
1984
), pp.
132
133
.
16.
K.
Iizuka
,
Engineering Optics
(
Springer-Verlag
,
Berlin
,
1983
).
17.
NSG America
,
SELFOC Handbook
(
NSG America, Inc.
,
Clark, New Jersey
,
1981
).
18.
J. W.
Goodman
, “Statistical Properties of Laser Speckle”, in
J.C.
Dainty
, ed.,
Laser Speckle and Related Phenomena
(
Springer-Verlag
,
Berlin
,
1978
).
19.
E. G.
Rawson
,
J. W.
Goodman
, and
R. E.
Norton
,
Opt. Lett.
vol.
5
, p.
357
(
1980
).
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