The LWIR revolution is here; a thermal camera with the capability to recognize the chemical composition of even freezing cold materials in pitch darkness.
Specim’s thermal airborne hyperspectral sensor AisaOWL, covers the contiguous spectral range from 7.6 to 12.3 μm in 96 channels and has the sensitivity to detect and classify even gases.
The AisaOWL is a fast pushbroom hyperspectral system designed to provide the remote sensing market with a high performance LWIR hyperspectral imager in the smallest achievable size. The AisaOWL cooling, so important to any proper LWIR sensor, is achieved through a stirling cycle cooler, greatly reducing complexity and achieving a sensor weight of only 13.1 kg.
Thanks to its design and sensitivity, AisaOWL captures all its spectral bands for the whole 384 swath-width of pixels simultaneously, and sustain the 100 frames per second storage speed of the whole datacube continuously. As a result, high sensor or target dynamics are possible without degradation of image quality.
The only moving part of the AisaOWL sensor is the shutter, used for dark image calibration between data collection sessions. Since the airborne image data is captured without any moving parts or requiring complex mounting systems, there are no distortions caused by any mechanical inaccuracies.
Line of sight jitter, sampling jitter, spatial pixel mixing, spectral shift and clipping effects are all major airborne hyperspectral imaging problems in Fourier Transform and whisk-broom type instruments, specifically addressed and removed by the design architecture of AisaOWL, while maintaining unparalleled sensitivity and lack of complexity.
AisaOWL delivers high quality, geo-referenced spectral radiance data. A sample of flight-line data from Cuprite, Nevada, USA. The spectral emissivity in 8 000 to 12 000 nm derived from radiance data is shown with example spectra from three different spots of the target area. Minerals that cannot always be mapped uniquely with VNIR/SWIR hyperspectral data such as quartz, feldspar, and chalcedony can be identified with LWIR hyperspectral data.
Specim provides AisaOWL as a full, ready to use system. The complete AisaOWL system consists of:
- The AisaOWL sensor with dual blackbody calibrator
- Data Acquisition and Power Unit (DPU) with a user-friendly interface and image acquisition software
- High performance GNSS/IMU sensor
- CaliGeoPRO pre-processing software
- Compact sensor
- Onboard calibrator
- No special maintenance requirements
- High sensitivity
- Excellent spectral and spatial imaging performance
- Covers full LWIR 7.7 to 12.3 µm with 96 spectral bands