Operational Guidelines -
Infrared Source Series 5x
The
HawkEye IR-5x Series utilizes a thin thermoresistive film of conducting
amorphous (diamond-like) carbon. Infrared radiation is the result of heating
this film by passing an electric current through it.
The maximum temperature of the film should not exceed 750°C in continuous
operation. A faint red luminescence of the film is observed during operation
at temperatures near 750°C. Short term heating up to 850°C is possible but
will reduce the lifetime of the unit.
The parameters shown below assume an infrared source operating without a
radiator and at ambient temperature and pressure. A rectangular voltage
pulsed at a frequency of 5 hertz and with a duty cycle of 50% is used for
heating. Two power leads and a ground are provided per the sketch below.
Bi-polar drive voltage may be used.
IR-5x Bottom View
Nominal
Parameters
(750°C) |
Resistance in Hot State (ohms) |
50 |
| Current (mAmps) |
133 |
|
Voltage (volts) |
6.8 |
| Input Power (watts) |
0.90 |
Maximal
Parameters
(850°C) |
Resistance in Hot
State (ohms) |
50 |
| Current (mAmps) |
150 |
| Voltage (volts) |
7.7 |
| Input Power (watts) |
1.17 |
The
HawkEye IR-5x Series is the perfect solution for an application that
requires fast electrical modulation. However, it can also be used in a
steady state (dc) mode. In applications where steady state power is used (or
if used with electrical modulation but with a duty cycle of greater than
50%), it is recommended that the nominal input power specifications not be
exceeded in order to avoid overheating of the membrane.
On the other hand, by reducing the length of the heating pulse or by
increasing the frequency of modulation, the membrane will not have
sufficient time to reach 750 °C. In this case, the pulsed power can be
increased to allow 750°C to be maintained. The chart below shows the factor
by which the voltage can be increased as frequency is increased. This chart
reflects both a 50% and a 25% duty cycle.
Using
the appropriate power factor as determined above, a 50% modulation depth is
achievable at modulation frequencies of more than 60 hertz at a 50% duty
cycle and more than 100 hertz at a 25% duty cycle.