is a Bolometer?
are detectors used to measure incident Infrared radiation. They are very
sensitive to thermal radiation and are predominantly used in the infrared
spectrum between 10 to 5000µm (30THz to 60GHz). The detector element is an
extremely sensitive thermistor that is cooled to LHe temperatures in order to
decrease the thermal background. Any thermal radiation that impinges upon the
detector will cause a temperature change. This will cause a change in
resistance which is amplified and measured as a voltage difference.
bolometers measure a change in temperature, the incident radiation must be
modulated. This allows the bolometer to excite and relax, thus a measurement of
the change in resistance is made that corresponds to the energy of the incident
radiation. The speed at which the bolometer reacts to this temperature change
is dependent upon several factors that can be altered, if desired, at the time
the system is ordered.
composite silicon bolometer systems are housed in our HDL-5 model, liquid helium
dewar with a liquid nitrogen cooled radiation shield. Standard hold times are
greater than 20 hours between fills for 4.2K systems and 10 hours for our 1.6K
models. The detector comes with an IR light collecting cone assembly,
vacuum-sealed wedged window, field of view baffling, and low noise electronics.
bolometer system is then outfitted with a single cut-on IR filter or a cold,
manually operated, 2 or 3 position filter wheel. We offer a selection of far IR
cut-on long pass filters that range from 10 to 285µm.
your application requires longer hold times, increased work height, dual
detectors, or more filter positions are required, please let us know. We are
committed to building a custom designed system to meet your individual needs.
Special requests for custom designs are always welcome.