Abstract:
A Fabry-Perot narrow band imager (NBI) is being built for solar studies at IIA [1]. The NBI
has an order sorting pre- lter that selects an optical beam within desired wavelength band. A
constant temperature is required to keep the transmission response of the interference lter stable
during the observations. This technical report describes the design and construction of a digital
temperature sensor and control system for the pre- lter assembly. Temperature measurement and
thermostat operations are performed by DS1621 -a semiconductor IC from Maxim. An I2C serial
interface (also called 2-wire interface) was developed using computer's parallel port. The design of
the I2C interface circuitry and LabVIEW programmes to implement serial communication between
the temperature sensor and the PC are described in details.The device operation is validated and
results of laboratory test are presented.
