Method and testing apparatus for testing an optical sensor

摘要

A method of testing an optical door sensor 100 with an emitter 102 and a receiver 106 comprising deploying an optical attenuator 152 between the emitter 102 and the receiver 106 causing the light signals 104 from the emitter 102 to be attenuated by an attenuation amount and evaluating the operation of the sensor 100, which may be determining if a light signal is detected, observing whether the door moves and/or an audible or visual alert. The attenuation may be increased progressively over a succession of stages and the operation of the sensor 100 may be evaluated for each stage. This may continue until a light signal from the emitter 102 is not detected by the receiver 106. The test may be used to determine a threshold value at which the receiver 106 no longer receives the light emitted. The optical attenuator 152 may be a variable opacity window. This test may be used in an automatic door such as an elevator.