However, because the photosensitivity spectrum of silicon is greater than that of the human eye, they have not proven useful for automotive dashboard illumination where the necessary glass filters and metal cases drive cost up. Detecting the perceived level of ambient light enables the brightness of displays to be controlled for power savings. This, says the company, is a significant advantage with cordless portable devices.
Mobile phones are another important application.
The first high-end models with the new ambient light sensor will appear on the market this year. It is often necessary to directly monitor the position of rotary actuators, ensuring they have in fact moved to the desired control position. One common practice is to monitor shaft rotation using a sensor assembly that mounts in a housing on top of the valve and over the end of the actuator shaft. The housing gives plenty of space for terminations, and a visual check on the actuation is possible through a window. Alignment of the sensors to the shaft might also degrade with time, rendering realignment necessary.