| How the Leica tracker
works |
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| • | Interferometer
beam reflects off mirror onto retro- |
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| reflector |
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| • | Beam returns in
same direction |
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| • | Reflector
movement along beam detected by |
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| interferometer |
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| • | Lateral reflector
movement causes beam |
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| displacement,
sensed at PSD |
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| • | PSD signal moves
mirror to keep beam on target |
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| • | Interferometer
and mirror's two angle encoders |
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| are read 3000
times per second |
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| • | Horizontal range
is 360º (±235º), vertical range is |
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| ±45º,
interferometer operation up to 40m |
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