Gary S. Kath is a senior manager at Merck & Co. Inc., Rahwah, N.J. he holds a BSEE from Widener University, Wilmington, Del., and an MSEE from Carnegie Mellon University, Pittsburgh, Pa. Email address: gary_kath@merck.com
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April 27, 2007[Ideas For Design] Add Position Detection Capability To Light-Curtain Circuitry
Light curtains use a linear array of LEDs and optical detectors to sense when an object breaks a light beam. Then they trigger an alarm output. However, light curtains typically don't provide spatial data to indicate where along the light curtain the light beam was broken. The design shown here adds that feature. It describes a circuit that senses where along the light curtain the beam was broken and transmits the location to a PC via RS-232. The length and resolution of...
