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AR500

AR500 Laser Position Sensors

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2. General Description

The AR500 is an ultra-compact laser diode-based distance measurement sensor

with available ranges covering 5 to 1000 mm. Consult the AR500 data sheet for

exact model range availabilities. The accuracy is generally specified with an

absolute linearity of +/- 0.15% of the span and a resolution of 0.01% of the

span. Linearity will vary depending on sample averaging, temperature, target

stability and surface reflectivity of the target surface. The AR500 laser sensors

can be ordered with a variety of red, blue and infrared laser diodes and a variety

of data interfaces. The sensor can be triggered externally and also has logic

outputs to trigger alarms, etc.

2.1 Principles of Operation

The AR500 uses laser triangulation principles to measure distance. The laser

beam is projected from the housing’s aperture and shines on a target surface,

where it creates a small spot. From there, the laser light is scattered in all

directions for diffuse surfaces (mirrors reflect the light specularly). A

collection lens is located behind a window in the sensor. It collects a portion

of the reflected light, which is focused on a CMOS detector array. The linear

position of this reflected spot is converted to an electrical signal which is

proportional to the target distance relative to the sensor. The position is

processed and communicated via serial, analog, digital or Ethernet interfaces.

2.2 Mechanical Dimensions

The following diagram shows the mechanical dimensions for the AR500. The

sensor unit has two 3.6 /06x7 holes on the sides. The cable is for power

and all communications (serial, analog, trigger, power, etc.). It is a 8-pin

connector (Binder series 712). The outer case of the sensor is cast aluminum

with annodization for corrosion resistance.

AR500 User’s Manual

LLL00xxxx – Rev 1.0

4

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