Passive millimeter wave radiometer system for calibration of infrared cameras
| DWPI Title: Light wave radiometer for measuring light received from source, has optical chopper that is mounted at angle relative to axis of primary light path such that optical chopper allow focused light to pass into secondary and tertiary light path |
| Abstract: An apparatus for accurate measurement of surface and sub-surface temperatures of an object from a distance without contacting the object is provided. Illustrative embodiments provide for simultaneous measurement of thermal emission and emissivity in the mm-wave regime thereby enabling real-time non-contact measurement of emissivity. Corrected temperatures for the object which may be used for calibration of infrared thermographic cameras are determined from the measurement of emissivity. |
| Use: Light wave radiometer for measuring light received from source. |
| Advantage: The proposed method allows for accurate non-contact measurement of temperatures from cryogenic to thousands of degrees Celsius through real-time emissivity measurement and correction. A unique and novel apparatus, and variation are provided that enables accurate measurement of temperature via simultaneous measurement of object emissivity. |
| Novelty: The light wave radiometer (400) has a optical chopper that is mounted in the primary light path from the parabolic mirror and the waveguide, and mounted at an angle relative to an axis of the primary light path such that the optical chopper periodically allows the focused light to pass into a secondary light path and a tertiary light path. A first radiometer receiver is mounted in the secondary light path. A second radiometer receiver is mounted in the tertiary light path. A first lock-in amplifier is electrically connected to the first radiometer receiver and configured to generate a first signal in response to receiving the focused light in the secondary light path. A second lock-in amplifier is electrically connected to the second radiometer receiver and configured to generate a second signal in response to receiving the focused light in the tertiary light path. |
| Filed: 8/8/2018 |
| Application Number: US16058855A |
| Tech ID: SD 14475.0 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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