The detection performance of an IR camera was analyzed using GRD analysis and NVTherm to detect a target size of 3m × 6m. The optical system design specifications were set with a F-number of 1.6, focal length range of 76.2mm to 24.456mm, and field of view of 9.1° × 6.1° - 29.9°× 22.0°, using a method to convert recognition range performance into GRD. We measured the image resolution performance of the camera produced based on the analysis results, in a laboratory environment. We installed a 4-bar target (I') with a spatial frequency corresponding to GRD (I) m at target distance A km on an optical collimator and acquired a photographic imagery of bar-target by setting the temperature difference corresponding to the target distance A km for distance simulation. The GRD resolution was defined as the resolution for which the number of clearly resolved images among the 50 acquired images was 80 % or higher (40 images or more). The measurement results confirmed that the GRD target corresponding to A km was well resolved. The detection range performance derived based on the GRD analysis was experimentally well demonstrated.
An airborne sensor is developed for remote sensing on an unmanned aerial vehicle (UAV). The sensor is an optical
payload for an eletro-optical/infrared (EO/IR) dual band camera that combines visible and IR imaging capabilities in a
compact and lightweight manner. It adopts a Ritchey-Chrétien telescope for the common front end optics with several
relay optics that divide and deliver EO and IR bands to a charge-coupled-device (CCD) and an IR detector, respectively.
For the easy assemble of such a complicated optics, a computer-aided alignment program (herein called simulator) is
developed. The simulator first estimates the details of the misalignments such as locations, types, and amounts from the
test results such as modulation transfer function (MTF), Zernike polynomial coefficients, and RMS wavefront errors at
different field positions. Then it recommends the compensator movement(s) with the estimated optical performance. The
simulator is coded on Matlab with the hidden connection to optical analysis/design software Zemax. By interfacing
ZEMAX and MATLAB, the GUI-based alignment simulator, will help even those not familiar with the two programs to
obtain accurate results more easily and quickly.
In order to meet volume requirement and provide high image quality for a Long Range Oblique Photography (LOROP)
system, we adopted Cassegrain-type telescope with lens compensators for the operation in both regions of 0.6 ~ 0.9 μm
(EO channel) and 3.7 ~ 4.8 μm (IR channel). To provide dual-band functionality, the tilted plane-parallel plate is applied
and acts as a beam splitter located in the space between primary and secondary mirrors. The system is near to telecentric
in detector space (EO) and telecentric in intermediate image space (IR). The telecentricity provides image height
constancy while adjusting the focus. The optical system includes Back Scan Mechanism (BSM) to compensate image
blurring for integration time.
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