The TTG-101 Thermal Test Target Generator is an essential hardware component used when evaluating the performance of complete thermal imaging systems. It may be used as a standalone instrument for making subjective measurement of MRTD and MDTD, or as part of a complete metrology system including a signal acquisition device and the I-SITE™ software package for evaluating these and other parameters objectively. The recent development of the BSC-1000 Blackbody System Controller has significantly improved the interface between the proven target generator and the user or system computer alike.
The TTG-101 head comprises an extended area variable-temperature source and an ambient-temperature target. In differential mode, the source maintains a preciselycontrolled temperature difference with respect to the target. Infrared radiation from the source passes through one or more aperture patterns cut into the target to produce a pattern of thermal contrast in the image plane of the imaging system under test. The relationship between the contrast in the image produced and the known temperature difference and spatial frequency of the target pattern can be used to determine the MRTD and MDTD for the system. When special targets are used with the I-SITE™ software, several other important imaging system parameters may also be measured.
Applications
Tests the performance of:
- Thermal imagers
- Thermography systems
- FLIRs
- Thermal sights
- Infrared cameras
Benefits
- As a stand-alone device,will allow measurement of subjective MRTD
- When used as part of a complete system,will allow measurement of objective MRTD and MDTD of thermal imagers (4-bar or MTF method)
- NIST traceable physical temperature and target dimension
Please consult with an Optikos engineer to determine the most appropriate targets for your application.
For use with measuring the following parameters:
- Line Spread Function (LSF)
- Modulation Transfer Function (MTF)
- Signal Transfer Function (SiTF)
- Noise Power Spectrum (NPS)
- Root Mean Square Noise (RMS)
- Noise Equivalent Temperature Difference (NETD)
- Minimum Detectable Temperature Difference (MDTD)
Specifications
| Temperature difference range | -20 to +70°C |
| Absolute temperature limits | 0 to 80°C (non-condensing) |
| Temperature uniformity | +/-0.5% over full temperature difference range (+/-0.01°C over +/-5°C range) |
| Accuracy of temperature control | +/-0.5% over full range full temperature difference range (+/-0.01°C over +/-5°C range) |
| Max slew rate | Greater than 30°C per minute |
| Settling time | < 30 sec |
| Maximum target diameter | 90 mm |
| Interface | RS-232 and Ethernet |
| Power | 1I0/220 VAC, 50/60 Hz |
| Physical | |
| Source unit and target wheel | W 330 mm x H 460 mm x D 420 mm (24 kg) |
| Electronics unit | W 340 mm x H 180 mm x D 370 mm (10 kg) |
| Remote control unit | W 80 mm x H 40 mm x D 160 mm (0.5 kg) |
The measurement of MRTD requires the TTG-101 Thermal Test Target Generator. A reflective collimator projects the source at infinity into the imager under test. In the system depicted the imager output is measured on its external display using the PMC-600 Photometric Camera.
Standard Equipment
- Source unit: Provides a large,uniform temperature background using thermoelectric devices and a platinum resistance thermometer (PRT)
- Target turret wheel: Holds up to five target plates positioned by remote control with a PRT that monitors the target temperature
- Electronics unit: Contains the thermal and turret wheel control circuits with touchscreen control.
- Remote control unit: Is a small,hand-held unit for convenient remote operation
- Optical Rail: Provides a common axis and mounting platform for the source unit and target turret wheel
Target Sets
The patterns on target plate sets include slits, circular apertures and 4-bar targets. Target plate patterns may be fitted vertically, horizontally or at 45 degrees in the turret wheel. Slits and large 4-bar targets are centered on separate plates. Circular targets and small 4-bar targets are grouped in one of two ways:
- Normal Plates
Target patterns are arranged in a circle about the center of the plate. 4-bar target patterns on any given plate are all parallel to each other. - Grid Positioned Plates
Target patterns are arranged in an arc across the plate and angled so that as the turret wheel is rotated, the specified pattern is brought into the center of the field of view.
Individual plates sold separately. Please consult with an Optikos engineer.
TGS-20 Blank Target
| Type | Set | Dimension |
| Blank | 1 target on 1 plate | — |
TGS-30 MTF Target Set
| Type | Set | Dimension |
| Slit | 2 targets on 2 plates | 0.22 mm & 0.72 mm in width |
TGS-40 MDTD Target (Normal)
| Type | Set | Dimension |
| Circular | 22 targets on 5 plates | 0.4 mm – 18.25 mm diameter |
TGS-50 MDTD Target Set (Grid)
| Type | Set | Dimension |
| Circular | 22 targets on 5 plates | 0.4 mm – 18.25 mm diameter |
TGS-60 MRTD Target Set (Normal)
| Type | Set | Dimension |
| 4-Bar | 22 targets on 11 plates | 0.4 mm – 18.4 mm in periodicity |
TGS-70 MRTD Target Set (Grid)
| Type | Set | Dimension |
| 4-Bar | 22 targets on 11 plates | 0.4 mm – 18.4 mm in periodicity |