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take an average measurement of a whole asterism. (Please note that the purpose
of this sensor is not to measure a narrow part of the deep sky).
The firmware of the Uranus device works in combination with the light sensor and
automatically:
o Compensates dark-current of the sensor based on ambient temperature
from the final reading.
o Configures sensor analog gain and integration time in order to adapt to the
current light conditions and utilize the full dynamic range of the sensor.
An average reading (10 consecutive measurements) of the light sensor can be
taken by keeping pressed the "Measure" push button or instructed from USB
communication (on-demand).
3.5
CLOUD INFRARED SENSOR
A high-precision non-contact infrared temperature sensor of 60° FOV is used to
measure the sky temperature. By consulting ambient temperature, the firmware
uses a formula to determine the existence of clouds.
The difference between the ambient temperature and the sky temperature is lower
when there is a clear sky compared with a cloudy sky. A sky temperature correction
model is applied to account for excessive atmospheric long wave radiation during
summer at different locations. A clear view of the sky is important because any
terrestrial object can cause parasite IR radiation.
Sensor IR temperature measurements and cloud index calculations based on the
temperature correction model are taken every 250 msec.
4 GPS
Uranus incorporates an ultra-low consumption and fast position GPS receiver. The
receiver has 66 acquisition channels, 22 tracking channels and can calculate, and
predict orbits automatically using the ephemeris data (up to 3 days) stored in
Uranus Meteo Sensor
Page 13 of 38
Pegasus Astro - Uranus Meteo Sensor Manual
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