Keyence laser sensor hones detection reliability
-- Test & Measurement World, 1/5/2008 8:26:00 AM
The GV series of digital CMOS laser sensors from Keyence uses a newly developed datum algorithm that enhances detection reliability and eliminates the common problems encountered when using conventional laser sensors. This optical triangulation sensor excels in detecting shiny targets with multiple reflections, as well as light-absorbing materials, such as black rubber.
Intended for automatic, inline sensing applications, the GV sensor detects target presence or absence based on surface characteristics or target height and provides a go/no-go output. Up to four sets of sensors and amplifiers can be used for each application. The GV series comprises four IP67-rated sensor head models with detection ranges of 45 mm (1.77 in.), 130 mm (5.12 in.), 450 mm (17.72 in.), and 1000 mm (39.37 in.).
The sensor has a larger CMOS pixel size than conventional systems, which enables it to receive a greater quantity of light, resulting in highly stable detection and faster response speeds. The GV datum algorithm employs a calibration technique in which the received light waveform pattern from a target or background is used to set upper and lower received light limits. Detection is stable even when the targets are moving or the background is unstable causing conditions where the target-to-sensor distance varies.
Three selectable detection modes are available on the GV amplifier unit. An edge-hold mode detects sudden changes in work-piece height; a surface-detection mode detects the nearest surface; and a clamp function ignores targets too close to the sensor head.
Keyence, www.keyence.com.
