Alexandrite Effect
Spectropyrometer
Alexandrite effect spectropyrometer (US Patents 7,004,624 and 7,052,177)
The alexandrite effect spectropyrometer measures the relative
spectral power distribution of a radiating body in the wavelength range of 380 -
760 nm, integrates the relative spectral power distribution in the wavelength
range, and determines its thermal temperature by the patented methods. It can
directly measure high to ultrahigh temperature from 800 K to 100,000 K of any
radiating bodies, such as blackbody, gray bodes, combustion chambers, gas
turbines, plasma jets, flames, electric arcs and
discharges, furnaces, metals and ceramics etc. At present, the spectropyrometer is
the only instrument that can directly measure temperature over 4000 K. The
spectropyrometer can directly measure high to ultrahigh thermal temperature
of plasma jets, electric arcs and discharges, and high temperature flames up to
100,000 K. The spectropyrometer is rugged to perform in the harshest measurement
environments.
The
alexandrite effect spectropyrometer measures the relative spectral power
distribution of a target to determine its temperature, thus, the emissivity of
the measured target is not required for accurate temperature measurement.
Whatever the emissivity of a target is, the spectropyrometer normalizes the
spectral power as 1 at 560 nm, and then calculates the temperature from the
relative spectral power distribution. If a group of gray bodies, for example,
have emissivities at 0.3, 0.6, and 0.9, their relative spectral power
distributions are the same as that of blackbody at the same temperature,
therefore, the measured temperature by the spectropyrometer is the same as that
of blackbody, however, the spectropyrometer does not need the emissivities of
the gray bodies to determine their true temperature.
The alexandrite effect spectropyrometer has a spectral
correction function, a sequential temperature measurement function, and a
temperature output port. The spectral correction function can be used to
correct spectra for accurate temperature measurement of the targets with
spectral lines and/or background noise. The sequential temperature
measurement function can be used to measure a target continuously with a
time interval as short as 10 ms, and the measured temperatures and spectra
are saved for industrial applications and spectroscopy study.
By using the
sequential temperature measurement function, the spectropyrometer can
measure a temperature distribution by one measurement, and can measure
temperature of a target emitting radiation in a very short time, such as an
electric discharge. The minimum measurement time of the spectropyrometer is
1 ms, minimum measurement interval is 10 nm, and the maximum measurement
rate is 100 times per second (100/s).
The temperature output port is compatible with other
industrial and scientific equipment for temperature control and other
purposes. The spectropyrometer can also continuously outputs spectra to
monitor a target for determining whether a processing is normal or a
criterion is over limit.
Specifications:
Temperature
ranges:
LASP 0280: 800
– 1,200 K
LASP 1280: 1,000 – 2,500 K
LASP 2280:
1,800 – 5,000 K
LASP 3280:
3,000 – 10,000 K
LASP 4280:
5,000 – 50,000 K
LASP 5280:
10,000 – 100,000 K
Wavelength range: 380
-760 nm
Temperature
resolution: 1 K
Wavelength
resolution: 1 nm
Minimum measurement time:
1 ms
Minimum measurement Interval:
10 ms
Maximum measurement rate:
100/s
Accuracy:
<
0.5% for targets
with continuous spectral emissions
<
1.0% for targets
with spectral lines
Temperature Scales:
Kelvin, Celsius and Fahrenheit
Liu
Research Laboratories, LLC
