Triangulating laser profilometer as a three-dimensional space perception system for the blind

R. Farcy; R. Damaschini

doi:10.1364/AO.36.008227

Applied Optics
Vol. 36,
Issue 31,
pp. 8227-8232
(1997)
•https://doi.org/10.1364/AO.36.008227

Triangulating laser profilometer as a three-dimensional space perception system for the blind

R. Farcy and R. Damaschini

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R. Farcy and R. Damaschini, "Triangulating laser profilometer as a three-dimensional space perception system for the blind," Appl. Opt. 36, 8227-8232 (1997)

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Abstract

We describe a device that is currently under industrial development and that will give blind persons a three-dimensional space perception. It consists of a triangulating laser telemeter head placed on the back of the hand and connected to a belt bag that contains the electronic parts and has auditory feedback close to the ear. The microprocessor unit converts in real time the distance measured by the telemeter in a sonorous musical note. Scanning the space with an adequate movement of the hand produces musical lines, corresponding to the profiles of the environment. We discuss the optical configuration of the system relative to our first year of clinical experimentation.

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Equations (13)

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Distance Interval	Musical Note	Frequency (Hz)
Centimeters
16–21	A	1760
21–27	G	1567
27–34	F	1396
34–42	E	1318
42–51	D	1174
51–61	C	1046
61–72	B	987
72–84	A	880
84–97	G	783
97–111	F	698
Meters
1.11–1.26	E	658
1.26–1.42	D	587
1.42–1.60	C	523
1.60–1.80	B	492
1.80–2.05	A	440
2.05–2.35	G	391
2.35–2.7	F	348
2.7–3.1	E	329
3.1–3.6	D	293
3.6–4.2	C	261
4.2–5	B	246
5–6	A	220
6–7.3	G	195
7.3–9	F	174
9–12	E	164
12–20	D	146
20–30	C	131

P_M (mW)	t(s)
2.1	0.1
1.4	0.5
1.2	1
1	2
0.85	4
0.71	8
0.6	16

Distance (m)	Uncertainty Intervals (pixels)	Uncertainty Intervals (m)
0.2	15	2 × 10³
0.6	10	1.6 × 10^-2
1	5	2.3 × 10^-2
2	2	3.8 × 10^-2
3	1	4.4 × 10^-2
6	0.5	9 × 10^-2
10	0.5	0.25
15	0.5	0.55
30	0.5	2.2

Distance Interval	Musical Note	Frequency (Hz)
Centimeters
16–21	A	1760
21–27	G	1567
27–34	F	1396
34–42	E	1318
42–51	D	1174
51–61	C	1046
61–72	B	987
72–84	A	880
84–97	G	783
97–111	F	698
Meters
1.11–1.26	E	658
1.26–1.42	D	587
1.42–1.60	C	523
1.60–1.80	B	492
1.80–2.05	A	440
2.05–2.35	G	391
2.35–2.7	F	348
2.7–3.1	E	329
3.1–3.6	D	293
3.6–4.2	C	261
4.2–5	B	246
5–6	A	220
6–7.3	G	195
7.3–9	F	174
9–12	E	164
12–20	D	146
20–30	C	131

P_M (mW)	t(s)
2.1	0.1
1.4	0.5
1.2	1
1	2
0.85	4
0.71	8
0.6	16

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