Film Thickness Probe Card
Original Publication Date: 1986-Mar-01
Included in the Prior Art Database: 2005-Mar-08
A number of applications require the processing of photodiode signals from a linear photodiode array. Because of random noise, multiple readings of the data from the photodiode array are required, after which the data must be averaged to eliminate the random noise component. Virtually any control computer using a "dumb" interface card to acquire the photodiode data can be used; however, it is easier and usually faster to use a microprocessor on a "smart" interface card to pre-process the photodiode data before transmitting it to a host computer. The implementation of this technique involves a microprocessor- based printed circuit card (compatible with the host system being used) to acquire, digitize, and average the photodiode signals from the array.