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From taosinc.com
The TSL2550 is designed for use with broad wavelength light sources and uses two photodiodes for deriving illuminance (i.e. lux). The first photodiode (Channel 0) is sensitive to both visible and infrared light, while the second photodiode (Channel 1) is sensitive primarily to infrared light. Channel 1’s digital output is used to compensate for the effect of the infrared light component on Channel 0. The formula below derives the ambient light brightness from the digital outputs of both channels to approximate the human eye response. If an embedded or micro controller is used to control the TSL2550 device, equation (1) may be difficult to implement since floating point arithmetic operations are generally not supported. Consequently, an alternative method using a simple look-up-table (LUT) was investigated to provide a simplified lux calculation. Products & Services
Lux meters or light meters measure illumination in terms of luxes (lx) or foot candles (fc).
Photodiodes are used for the detection of optical power (UV, Visible, and IR) and for the conversion of optical power to electrical power.
Charge coupled device (CCD) cameras contain light-sensitive silicon chips that detect electrons excited by incoming light. They also contain micro circuitry that transfers a detected signal along a row of discrete picture elements or pixels, scanning the image very rapidly. CCD cameras use two-dimensional CCD arrays with many thousand of pixels.
Optocouplers are capable of transferring an electrical signal between two circuits while isolating the circuits from each other.
Video cameras take continuous pictures and generate signals for display or recording. They capture images by breaking them down into a series of lines. This search form does not include consumer devices such as camcorders.
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Technical Articles
Simplified Lux for Embedded and Micro Controllers (.pdf)
- Microprocessors and Microcontrollers
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