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Range finder is a device that measures distance from the observer to a target. Some devices use active methods to measure (such as sonar, laser, or radar). There are other devices that measure distance using trigonometry to determine distance. They usually use a set of known distances or target sizes to make the measurement.
Laser Range Finder
Laser
range finder is an electro-optical instrument whose operation
is based on an echo principle employing an infrared
light pulse of high intensity. When the instrument is triggered, this
short, invisible light pulse is transmitted along a very narrow path.
On hitting a target, a small portion of the transmitted light is reflected
back along the path towards the instrument where it passes through
an optical system to a receiver. The range of the target is determined
by the time interval elapsed from the moment of transmission of the
pulse to the moment of reception of the returned "echo" from the target.
The unit can also be mounted on a light-weight tripod
and goniometer in order to obtain elevation and azimuth angles of
targets.
Night Vision Gear carries
selection of quality Bushnell range
finders, as well as laser
range finders and rangefinder
binoculars in various price ranges.
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