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1.4 Advantages of the BASF Optical Thermometer
The EXACTUS
®
line of optical thermometers provides many advantages for optically based
temperature measurement. These include:
1.
The ability to measure small signals and lower temperatures at short wavelengths
Careful design and use of an advanced amplifier circuit enables measurement of signals as
small as 10
-15
amps from the photo detector. The ability to measure smaller signals enables
the measurement of lower temperatures while using short wavelengths. Short wavelengths
significantly reduce emissivity errors and are ideal for many applications such as the
measurement of silicon wafers in the semiconductor industry. (See Resolution in Section 7.)
2. High resolution, with measurements to 0.01°C
Precise amplification also means less electrical noise, and therefore lowers noise in the
temperature measurements. This enables measurement and control of smaller changes in the
process temperatures, leading to more stable process control and higher yields.
3. High speed, digital readings at up to 1,000 readings per second
EXACTUS
®
instruments can provide temperature readings ranging from one reading per
minute all the way up to 1,000 readings per second. In addition, the instrument performs all
the A/D conversions internally, so each instrument provides a digital signal output. BASF
also offers an analog output module for applications where a proportional to temperature
current or voltage output is desired.
4. The ability to read a wide range of temperatures - from 25 °°°° C to 4,000 °°°° C
The electronics design also allows a wider range of temperatures to be measured. Typically,
hot objects from about room temperature (25°C) to 4,000°C can be measured. Contact your
sales technician for more specific details.
5. Low-drift electronics
Special care has been taken in the selection and design of components to minimize drift in
the electronics. This has resulted in electronics drift of only 0.10ºC or less per year.
6. A highly compact design which provides flexibility in placement and eliminates the
need for fiber-optic cables
The small (1” diameter x 4.5” length / 25.4mm x 115mm) package with world-class
performance allows the
EXACTUS
®
instrument to be placed close enough to hot objects to
eliminate the need for long flexible fiber-optic elements required by other systems. This is
critical since about 80% of the light (and therefore about 80% of the signal) can be lost when
fiber-optic cables are used to transmit light to the photo detector. In applications where fiber
optic cables are required, BASF’s sensitive electronics still provide a significant advantage
and we offer a full line of flexible quartz fiber-optic cables for those situations where they are
needed.