IR emitters are thermal emitters. There are two types available: traditional emitters based on metal alloys and MEMS emitters based on diamond-like carbon (DLC).
Variably pulsable up to 100 Hz at temperatures of up to 750°C.
In the following, thermal emitters are referred to as IR emitters (as opposed to diode lasers).
LASER COMPONENTS’ range of products includes emitters produced in house, as well as those produced by CAL Sensors. All IR emitters are delivered in a TO housing.
IR emitters often compete among users with special, inexpensive micro incandescent lamps. These lamps often feature a suitable level of radiation at wavelengths of up to approximately 4.5 µm; however at larger wavelengths, the use of IR emitters is mandatory.
Although, it may also be sensible to use special IR emitters below 4.5 µm:
For one, IR emitters are mechanically robust; for another, some models are particularly suitable for electric pulsing (some up to 100 Hz).
Micro incandescent lamps will see a tendency toward a decline in production because use of alternative technologies in control panels and displays will dominate this area more and more.
Emitters from CAL Sensors (CAL-Source) are based on metal alloys. They are available as coils (SA series, DC type for non-pulsed operation) or as small metal bands (SVF series, for pulsed operation). A parabolic mirror is integrated by default. The technology used is robust and has been proven many times over – improvements are almost impossible. The maximum temperature is 730°C.
CAL Sensors has expanded its series of pulsable emitters with the new SPF series for high speed. A degree of modulation of 50% is achieved at approximately 180 Hz. Emitters with a maximum temperature of 1000 K come in a TO-5 housing with an integrated reflector and sapphire window.
The SF-series infrared emitters are designed to be used as low cost pulsed source of blackbody radiation for near-to-far infrared applications. The radiating element is an ultra-thin metallic foil with an emissivity of 0.88 and closely emulates a blackbody source in spectral distribution.
PIREPLUS: Pulsable IR Emitter as a Compact Module
This IR emitter module is sold under the trade name PIREPLUS. The module fits on a 14-pin IC socket. It features a peak temperature of 730°C, and the emitter still has a modulation depth of 50% even at 180 Hz. It emits wavelengths of up to 5 µm. Operation requires supply voltages of +12 volts and +5 volts.
LASER COMPONENTS’s diamond-like sources (DLS) are MEMS structures; more specifically, they are micromechanically-structured hot plates. A carbon-based nanocomposite (amorphous diamond) is deposited as a resistance material on a silicon membrane. The material has two main features: a very low temperature coefficient of the resistance and a rate of emission of 80%. Contact us today for more information!
- Due to the short thermal time constant, modulation depths of approximately 25% and 10% can be achieved at modulation frequencies of 100 Hz and 1000 Hz, respectively.
- Due to constant resistance, a spike in current cannot be observed at start-up.
- The emitter is stable in shape and position.
- At a maximum temperature of 750°C (10 Hz, duty cycle: 50%), a life expectancy of 30,000 hours can be achieved; at 600°C, 250,000 hours can be achieved.
The DLS series succeeded the previous Intex emitters. One major improvement is the significantly increased reliability that can be traced back to a tighter process control and homogeneous membranes.
The actual active material is referred to as nano-amorphous carbon (NAC) and is a member of the diamond-like materials. NAC has two structural networks: hydrogen-containing carbon and a network that consists of silicon oxides. Both structures stabilize each other and prevent crystallization.