 The ellipsoidal radiometer is used to measure the total radiative flux
incoming from the medium facing the tip of the radiometer. The information obtained using
this instrument is of interest whenever the distribution and magnitude of radiative heat
transfer is required near the boundary of the combustion chamber. Traversing measurements
through the flame are also possible and provide additional information on the flame
radiative properties.
The instrument consists of a water
cooled ellipsoidal cavity having an aperture at one focus and a thermopile at the other.
The ellipsoidal cavity has the optical property of focusing all the radiation entering the
orifice onto the surface of the thermopile. In order to minimize the radiation loss by
absorption at the surface of the ellipsoid, the latter is plated with a 0.5 mm gold layer.
The thermopile is a heat flow plug of stainless steel with two thermocouple junctions at
each end (constantan wire) which produces an e.m.f proportional to the energy absorbed at
the pellet. A protecting window is mounted in the ellipsoidal cavity to avoid damage to
the thermopile and convection errors. A purge flow of dry nitrogen (35-50 1/h) is injected
on the orifice side of the window in order to prevent the entry of combustion gases.
The response time of this
instrument is long relative to the frequency of fluctuations of the total radiative flux,
so that only steady state measurements are possible. A fast response version of this
instrument is currently under development.
VENDOR: IFRF Research Station b.v.
Would you be interested in:
- getting more information about
this measurement equipment?
Please contact us:
IFRF Research Station B.V.
P.O. Box 10 000
1970 CA IJmuiden
The Netherlands
email: sales@ifrf.net
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