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| The
receiver for an Optec LPV-2 |
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| transmissometer, which measures the |
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| light
extinction coefficient by |
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| measuring
the attenuation of light |
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| from a light
source. |
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| The IMPROVE Modular
Aerosol |
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| Sampler which, measure fine and |
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| total
aerosol mass. The sampler was |
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| developed
and refined by the |
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| IMPROVE
program, and has been in |
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| operated since
1987. |
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