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ABOUT DISTANCE MEASUREMENT SENSORS
There are two types of distance measurement
sensors. The first type uses time-of-flight
measurement of laser light to determine
the distance. In proximity mode, these
devicescan detect minute objects with
difficult surface characteristics at great
distances, even in front of a shiny background.
When large measuring ranges are involved,
the sensor measures the distance to a
reflector. In this way, distances of up
to 500 meters can reliably determined.
 The
second type uses laser light, red light
or infrared light in conjunction with
the triangulation measurement method.
Theis user-friendly "teach-in"
function is used to adjust and calibrate
the sensors. These sensors, which can
function as both sensors and measuring
devices, can detect minute objects, indentations
or unevenness.
The DME 2000, DME 3000, and DME 5000
distance measuring devices use phase correlation
to meassure the transit time of light
from a semiconductor Class II laser and
calculate the distance to the target.
External data processing can be accomplished
with an 8-digit display, a serial interface
or an analog current output. The DMEs
offer two user-selectable outputs and
a user-friendly menu helps customize the
device's parameters to individual application
needs.
The WTA 24 is also excellent for distance
applications. It uses an infrared light
source and a patented system of parabolic
imrrors to produce highly accurate of
target color of reflectivity. It can even
detect objects with as little as 6% reflectivity
and can easily be integrated into transfer
and processing lines.
The DT 2 is a triangulation sensor, featuring
plug and play set up for use in close-range
applications.
By means of phase correlationthe DT 200
analog laser sensor measures by time-of-flight
up to a distance of two meters with millmeter
resolution.
The DMT/DML sensors have sensing ranges
of up to 155 meters on white surfaces
and more than 1 km if reflectors are used.
The pulse-travel time is measured by tiny
flashes of laser light, only four nanoseconds
long.
LINKS
Distance Measurement Sensor Product Information
(PDF)
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