Patent ID: 8717184

Claim:
A sensor device for detecting an object, including optically detecting smoke particles, the sensor device comprising: a light transmitting device for emitting transmit radiation; a receiving device for receiving receive radiation having scattered radiation generated by means of an at least partial scattering of the transmit radiation by the object, and for outputting a measurement signal indicative of the receive radiation; a signal modification device for modifying the measurement signal and for outputting a modified measurement signal, a level of the modified measurement signal increasing after said light transmitting device has been switched on; and a control device for monitoring the modified measurement signal, said control device embodied to detect a reaching of a predefined signal level for the modified measurement signal and to determine a time interval between a switching on of said light transmitting device and the reaching of the predefined signal level; said control device coupled to said light transmitting device, said control device configured to apply at least one pulse to said light transmitting device, wherein a pulse duration of said pulse is correlated with the time interval between the switching on of said light transmitting device and the reaching of the predefined signal level.