Overview
We developed four radiometric MW640-15 lenses, enabling microscopic temperature measurement of features down to 2µm. Lenses are manufactured from Germanium, Zinc Selenide, and Zinc Sulfide with anti-reflective coatings for maximum transmission in the long wave infrared region. Each lens is designed for maximum sensitivity, long working distance, and with minimum distortion for clear, precise imaging. The threaded interface reduces the space required to attach the lens while maximizing thermal uniformity between the lens and camera body to maintain the high measurement accuracy.
Example Images
Click on the images below to view the actual 640 x 512p image. Reference pixel resolution of each lens image using the USAF table below.
USAF 1951 chart from 80µm lens perspective
USAF 1951 chart from 20µm lens perspective
USAF 1951 chart from 5µm lens perspective
USAF 1951 chart from 2µm lens perspective
Applications
- Microscopic temperature measurement and analysis of features down to 2µm in size
Features
Comprehensive Calibration
Each lens is calibrated while installed on the camera, resulting in unsurpassed accuracy and measurement uniformity across the entire field-of-view.
Specifications
Optics
| MW640-15 Relay Lens | MW640-15 80 Micron Lens | MW640-15 20 Micron Lens | MW640-15 5 Micron Lens | MW640-15 2 Micron Lens |
Optical Magnification | 1X | 0.1875X | 0.75X | 3X | 7.5X |
Pixel Resolution | N.A. | 80 µm | 20 µm | 5 µm | 2 µm |
Focus | N.A. | Fixed | Fixed | Fixed | Fixed |
Working Distance | 10 mm | 195 mm | 68mm | 27 mm | 13 mm |
Field of View | N.A. | 51.2 x 40.96 mm | 12.8 x 10.24 mm | 3.2 x 2.56 mm | 1.28 x 1.024 mm |
Focal Length | 23.8 mm | 35.7 mm | 40.1 mm | 34.6 mm | 19.8 mm |
Object Space NA | 0.126 | 0.025 | 0.098 | 0.367 | 0.600 |
Depth of Field | ±50µm | ±2000µm | ±100µm | ±10µm | ±2µm |
Measurement
Calibration Range † | N.A. | Low range: 10 to 80°C * High range: 10 to 300°C | Low range: 10 to 80°C * High range: 10 to 300°C | Low range: 10 to 80°C * High range: 10 to 300°C | Low range: 10 to 80°C * High range: 10 to 300°C |
Sensitivity (NETD) ‡ | N.A. | Low range: < 20 mK (100 Hz) | Low range: < 20 mK (100 Hz) | Low range: < 20 mK (100 Hz) | Low range: < 20 mK (100 Hz) |
Accuracy | N.A. | Low range: +/-2°C High range: +/-2°C or 2% of reading § | Low range: +/-2°C High range: +/-2°C or 2% of reading § | Low range: +/-2°C High range: +/-2°C or 2% of reading § | Low range: +/-2°C High range: +/-2°C or 2% of reading § |
* Sentris low range calibrations are optimized for highest sensitivity and may have reduced calibration range.
† The calibration range stated in the specification indicates the range of black-body temperatures used during calibration. Temperature measurements outside of the stated range may be able to be performed but may not meet the specified measurement accuracy.
‡ Noise Equivalent Temperature Difference (NETD) specifies the smallest temperature difference that can be detected. The value stated is NETD at 100 Hz frame rate. Activating real-time image averaging can improve NETD but will increase the measurement response time.
§ whichever is greater