Optical deformation sensor with operational testing by different wavelenghts, for side crashes
AssigneeRobert Bosch GmbH
InventorFrank-Jurgen Stuetzler
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Abstract
A deformation sensor is described which does not require a supplementary sensor to check functionality. This deformation sensor includes an optical transmission medium (ÜM1, ÜM2), multiple transmission elements (S1, S2), which couple the light of various wavelengths (λ1, λ2) into the transmission medium (ÜM1, ÜM2), and multiple reception elements (E1, E2), which selectively couple the transmitted light out of the transmission medium (ÜM1, ÜM2) according to wavelength. An evaluation unit (AW) detects deviations between the output signals (a1, a2) of the reception elements (E1, E2) and signals a malfunction of the sensor if the deviations exceed a preset measure.
Claims7
A deformation sensor, comprising an optical transmission medium (ÜM1, ÜM2), means (S1, S2, SK) for coupling light into the transmission medium (ÜM1, ÜM2) and means (E1, E2, EK) for receiving the light transmitted via the transmission medium (ÜM1, ÜM2), an evaluation unit (AW) being present which detects the change in intensity of the received light depending on the deformation, wherein multiple transmission elements (S1, S2) are present which couple the light of various wavelengths (λ1, λ2) into the transmission medium (ÜM1, ÜM2);
- a plurality of reception elements (E1, E2) are present which selectively couple the transmitted light out of the transmission medium (ÜM1, ÜM2) according to wavelength;
- and the evaluation unit (AW) detects deviations between the output signals (a1, a2) of the reception elements (E1, E2) and signals a malfunction of the sensor if the deviations exceed a preset measure.
Dependencies are inferred from the claim text.