Our Blackbodies are highly uniform, temperature stable sources of infrared radiation. We offer various models differing in temperature range, cavity aperture and cavity material. We also offer variable speed choppers for applications requiring modulated infrared radiation.
These sources emit blackbody radiation by multiple reflection, absorption and re-emission of the thermal energy. The thermal energy of the cavity is provided by a ceramic sealed heater coil that uniformly heats the cavity cylinder to temperatures from 50 °C to 1050 °C or 50 °C to 1200 °C, depending upon the model of blackbody. The lower temperature model uses a stainless steel cavity; the higher temperature model uses a silicon carbide cavity.
Operation
These sources emit blackbody radiation by multiple reflection, absorption and re-emission of the thermal energy. The thermal energy of the cavity is provided by a ceramic sealed heater coil that uniformly heats the cavity cylinder to temperatures from 50 °C to 1050 °C or 50 °C to 1200 °C, depending upon the model of blackbody. The lower temperature models use a stainless steel cavity; the higher temperature model uses a silicon carbide cavity.
Integral Aperture Wheel on Selected Models
Our 1.0-inch (25.4 mm) diameter cavity blackbodies include an 8-position aperture wheel with 7 apertures and 1 open position. The aperture sizes are listed in Table 1.
Table 1 Aperture Sizes for Selected Blackbodies
|
Aperture Size |
|
(inch) |
(mm) |
| 0.6 |
15.2 |
| 0.4 |
10.2 |
| 0.2 |
5.1 |
| 0.1 |
2.5 |
| 0.05 |
1.3 |
| 0.025 |
0.64 |
| 0.0125 |
0.32 |
Fig. 1 Emissivity of 67030/31 Blackbody at 1000 °C, 0.5 inch (12.7 mm) aperture.
Fig. 2 Irradiance of Oriel Blackbodies at various cavity temperatures.
Laboratory Use or Integrated Sub-System
We offer blackbodies with cavity apertures of 0.25-inches (6.35 mm), 0.4-inches (10 mm) and 1.0-inch (25.4 mm). The 1.0-inch (25.4 mm) models have an internal fan that maintains the source's body temperature cool and allows them to be handled. The smaller cavity models do not use a fan. Their body temperatures become dangerously hot to the touch; they are intended for use as integrated sub-systems, i.e. an Oriel MIR8025™ Modular IR Fourier Spectrometers.
System Components
Each blackbody system is comprised of the blackbody cavity and a controller. The controller ensures accurate temperature control and displays the blackbodies' operating parameters. It controls the cavity's temperature using the Proportional, Integral and Derivative parameters (P.I.D.) of the source, to provide stable temperature control, fast response time, and prevention of excessive settling time and overshoot. All adjustments, parameters and indications are accessible from the front panel. The front panel contains 7 LEDs for visual indication of pertinent controller activity plus a large LED display of blackbody temperature, and an interactive LCD menu display for presentation and parameter setting.
Optional Energy Modulator
For applications requiring a modulated IR source, choose one of our variable speed choppers. The chopper couples directly to the output of the specified blackbody. Each chopper system includes an enclosed chopper wheel and a controller; the blades are sold separately.
