Novel electrical circuits for background light noise rjection in an optical range finder

摘要

In a system for irradiating the light waves (infrared LASER Diode or LED) in the transmitting apparatus and receiving the reflected light causes a fatal error with effects such as sudden flashes or background light. The method for compensating the transmission is generally modulated light source, or compensation by adding an optical filter in front of the sensor receiving device.; In general, using the optical filter of a receiving apparatus using a reflection light background light noise (glare or sunlight) removal method is not in use for a relatively inexpensive LED due to reduction in amount of light received due to an optical filter used must use expensive LASER Diode, optical the total price of the system is increased because of the expensive filter itself.; According to the invention, a way to remove the background optical noise as a disadvantage to be pointed out in the receiving device using a light wave to the optical method than the electronic circuit and the circuit is provided. Also receives becomes it does not use an optical filter to the device cheaper the cost of the receiving apparatus, as well as and less expensive than the transmission apparatus using a laser diode can be an infrared LED which is not susceptible to easy and temperature effects of driving the transmission light source, and the drive circuit is simplified, reliability can implement a high transmission apparatus.