Characterization of a Low-Cost Optical Flow Sensor When Using an External Laser as a Direct Illumination Source

View/ Open
Issue date
2011Author
Suggested citation
Font Calafell, Davinia;
Tresánchez Ribes, Marcel;
Pallejà Cabrè, Tomàs;
Teixidó Cairol, Mercè;
Palacín Roca, Jordi;
.
(2011)
.
Characterization of a Low-Cost Optical Flow Sensor When Using an External Laser as a Direct Illumination Source.
Sensors, 2011, vol. 11, núm. 12, p. 11856-11870.
https://doi.org/10.3390/s111211856.
Metadata
Show full item recordAbstract
In this paper, a low cost optical flow sensor is combined with an external laser
device to measure surface displacements and mechanical oscillations. The measurement
system is based on applying coherent light to a diffuser surface and using an optical flow
sensor to analyze the reflected and transferred light to estimate the displacement of the
surface or the laser spot. This work is focused on the characterization of this measurement
system, which can have the optical flow sensor placed at different angles and distances
from the diffuser surface. The results have shown that the displacement of the diffuser
surface is badly estimated when the optical mouse sensor is placed in front of the diffuser
surface (angular orientation >150°) while the highest sensitivity is obtained when the
sensor is located behind the diffuser surface and on the axis of the laser source (angular
orientation 0°). In this case, the coefficient of determination of the measured displacement,
R2
, was very high (>0.99) with a relative error of less than 1.29%. Increasing the distance
between the surface and the sensor also increased the sensitivity which increases linearly,
R2
= 0.99. Finally, this measurement setup was proposed to measure very low frequency
mechanical oscillations applied to the laser device, up to 0.01 Hz in this work. The results
have shown that increasing the distance between the surface and the optical flow sensor also
increases the sensitivity and the measurement range.
Is part of
Sensors, 2011, vol. 11, núm. 12, p. 11856-11870European research projects
Collections
The following license files are associated with this item: