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  • Testing laser systems / Universal tester of laser range finders


Article: 00249825

Testing laser systems / Universal tester of laser range finders

LTE test station enables expanded tests of laser range finders at laboratory conditions without necessity of frequent costly and time consuming field tests. The station enables measurement of design parameters, final performance parameters and also checking boresight errors. The first group includes such parameters like pulse energy, pulse peak power, pulse time width, pulse frequency, beam divergence, receiver sensitivity. The second group includes accuracy of distance measurement, distance discrimination, and extinction ratio (ER). Boresight errors are understood as angles between optical axis of three blocks: transmitter, receiver and aiming channel. LTE test station can be treated as an universal test station suitable for both manufacturers, maintenance/repairing workshops and final users of laser range finders. Final performance tests are often done at field conditions when tested LRF shoots directly to a reference target (Lambertian type target of known reflectance) located at maximal operational distance of the tested device or when LRF shoots to a target located at short distance but through an optical medium of regulated attenuation. In both cases the field tests are time consuming and test results are sensitive to atmospheric conditions. Next, field tests give valuable information that something is wrong with tested LRF but do no deliver information what is wrong. In this situation a station capable to carry out measurement of both performance parameters and design parameters at laboratory conditions is very useful for both final users and manufacturers of LRFs. In general LTE station imitates real field tests. The station simulates a square target of regulated angular size located at regulated distance and seen through a medium of regulated attenuation. The user can see image of the target and shoots to it like to a real target. In detail, LTE station measures parameters of optical pulse (pulses) emitted by transmitter of tested LRF and generates with some temporal delay optical pulse of regulated properties directed into receiver of tested LRF. A long series of parameters of both transmitter and receiver can be measured during such tests. Boresight errors of LRF can be checked, too. Types of tested LRFs From the point of optics the laser range finders can be divided onto several groups: 1. Dual channel LRFs with integrated sight (two separate optical channels (receiver and transmitter) and aiming system integrated with transmitter or receiver. The channels are located at very short distance from one to another. The aiming device can be optical sight, VIS-NIR camera, or night vision device. 2. Dual channel LRFs with a sight as a separate optical channel but located at very short distance to transmitter or receiver. 3. Dual channel LRFs with an external sight located at significant distance from receiver or transmitter. 4. Single channel LRFs built using using a single coaxial optics channel (receiver is integrated with transmitter and sometimes also with an aiming device into one optical system) 5. Dual channel LRFs built using an external thermal imager as a sight. LTE station in basic version enables testing type 1-2 devices that represent at least 98% of all LRFs offered on market. LTE can be also delivered in optional version that can be used for testing all types of laser range finders.


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