Category : Environmental measurement, test and control equipment > Photometers

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The CE 318 automatic sun tracking photometer has been designed and realized to be a very accurate sun photometer with all the qualities of a field instrument : motorized, portable, autonomous (solar powered) and automatic. Its main purpose is to measure sun and sky radiance in order to derive total column water vapor, ozone and aerosols properties using a combination of spectral filters and azimuth/zenith viewing controlled by a microprocessor.
The sun photometer CE 318 is composed of an optical head, an electronic box and a robot.
The optical head has two channel systems : the sun collimator, without lens, and the sky collimator with lenses. The sun tracking is equipped with a 4- quadrant detector.
The electronic box contains two microprocessors for real time operation for data acquisition and motion control.
In automatic mode, a ‘wet sensor′detects precipitation and forces the instrument to park and to protect the optics.
The robot is moved by step-by-step motors in two directions : in the zenith and azimuth planes. The computation of sun equations (like air mass) is performed by two CPU cards.
Measurement sequences are available to measure sky and sun radiance. Different scenarios, detailed on the next page, have been created to make various kinds of measurement automatic.
The data from the memory of the sun photometer can be transferred to a PC or via the Data Collection Systems (DCS), to one of the three geostationary satellites : GOES, METEOSAT or GMS and then retransmitted to the appropriate ground receiving station. The data can be retrieved for processing either by modem or internet linkage resulting in near real-time acquisition from almost any site on the globe excluding pole ward of 80° latitude.

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List of all articles in this sub-category Photometers

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