The degree of change that a sensor will indicate is also denoted by E, which translates into the resolution of a color sensor. Therefore, when E is specified for a sensor, it is important to note the color space for which it is calibrated. Color Sensors Complex color sensors like colorimeters and handheld spectrophotometers provide numeric feedback for even the most minute color differences. However, a significant portion of color sensing applications require only an indication of the presence or gray-scale change of a color mark. That is, red, green and blue light are emitted from the sensor and a response is generated based on the amount of each color reflected off the target and received by the sensor.
Light sources can be incandescent or LEDs.
As a rule, LED technology is more expensive than incandescent, but has life spans on the order of 100,000 hours. LEDs also allow for reduced sensor size and more effective heat dissipation. All rights reserved.