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SA红外直流光源
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Key Features
• Steady State (DC) Emitters
• Emulates a Black-body in Spectral Distribution
• Coiled Filament with Specialized Coating
• Reflector Provides Collimated and Uniform Radiation
• Typical Emissivity 0.70
Filament Temperature vs. Input Power
Opto Diode SA-series infrared (IR) emitters are designed to be used as steady state (DC) emitters
of black-body radiation. The radiating element in the steady-state emitters is a coiled filament
of specific material with a specialized coating with typical emissivity of 0.70. Radiated output
closely emulates a black-body in spectral distribution. SA-series emitters are designed to
operate at a rated filament temperature of 1170 K. Standard SA-series emitters are offered in
several models with specific filament diameters and number of coils to provide the desired input/
output power at a filament temperature of 1170 K.
Standard window materials are available to tailor the output to specific wavelength ranges of interest.
Standard models include a parabolic reflector to provide near collimated and uniform radiation output.
Drive Circuit
Any constant voltage or constant current DC power supply with appropriate rating.
Filament Temperature vs. Input Power
Steady State emitters are designed to operate with a filament temperature of approximately 1170 K (900°C)
at the rated input power. Exceeding this value will raise the element temperature and decrease emitter
lifetime. Since the radiated energy is proportional to the fourth power of the absolute temperature (T4),
accurate control of the input power and proper heat sinking of the package are essential to maintain constant
element temperature and output. The heat sink must limit the package temperature to not more than 100°C.
The relationship between peak wavelength (λpk in microns) and temperature (T in K) for the black-body spectrum
is expressed by Wien’s law as:
λpk (microns) x T (K) = 2898
Thus, the wavelength for maximum output varies inversely with the absolute temperature. At a temperature of 1170 K, this maximum
is at 2.5 microns. SA Series steady state emitters are quasi-black-body with an emissivity of 0.70. The emissivity is the ratio of the
energy radiated by the source to that which would be radiated by a true black-body at the same temperature.
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