Determination of an absolute radiometric value using blocked infrared sensors
First Claim
1. A method comprising:
- capturing a signal from a shielded infrared sensor that is blocked from receiving infrared radiation from a scene;
capturing a signal from an unshielded infrared sensor configured to receive the infrared radiation from the scene, wherein the shielded infrared sensor and the unshielded infrared sensor are part of an infrared sensor assembly;
determining a temperature dependent infrared radiation contribution from a shield structure of the infrared sensor assembly incident on the shielded infrared sensor;
determining an average thermographic offset reference based on the captured signal of the shielded infrared sensor reduced by the determined infrared radiation contribution;
determining an absolute radiometric value, corresponding to the infrared radiation received from the scene by the unshielded infrared sensor, based on the average thermographic offset reference and the captured signal of the unshielded infrared sensor; and
wherein the absolute radiometric value is determined without the use of a shutter.
2 Assignments
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Accused Products
Abstract
Various techniques are provided for using one or more shielded (e.g., blinded, blocked, and/or obscured) infrared sensors of a thermal imaging device. In one example, a method includes capturing a signal from a shielded infrared sensor that is substantially blocked from receiving infrared radiation from a scene. The method also includes capturing a signal from an unshielded infrared sensor configured to receive the infrared radiation from the scene. The method also includes determining an average thermographic offset reference for the shielded and unshielded infrared sensors based on the captured signal of the shielded infrared sensor. The method also includes determining an absolute radiometric value for the scene based on the average thermographic offset reference and the captured signal of the unshielded infrared sensor.
196 Citations
16 Claims
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1. A method comprising:
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capturing a signal from a shielded infrared sensor that is blocked from receiving infrared radiation from a scene; capturing a signal from an unshielded infrared sensor configured to receive the infrared radiation from the scene, wherein the shielded infrared sensor and the unshielded infrared sensor are part of an infrared sensor assembly; determining a temperature dependent infrared radiation contribution from a shield structure of the infrared sensor assembly incident on the shielded infrared sensor; determining an average thermographic offset reference based on the captured signal of the shielded infrared sensor reduced by the determined infrared radiation contribution; determining an absolute radiometric value, corresponding to the infrared radiation received from the scene by the unshielded infrared sensor, based on the average thermographic offset reference and the captured signal of the unshielded infrared sensor; and wherein the absolute radiometric value is determined without the use of a shutter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus comprising:
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a shielded infrared sensor blocked from receiving infrared radiation from a scene; an unshielded infrared sensor configured to receive the infrared radiation from the scene, wherein the shielded infrared sensor and the unshielded infrared sensor are part of an infrared sensor assembly; and a processing device configured to; determine a temperature dependent infrared radiation contribution from a shield structure of the infrared sensor assembly incident on the shielded infrared sensor, determine an average thermographic offset reference based on a captured signal from the shielded infrared sensor reduced by the determined infrared radiation contribution, determine an absolute radiometric value, corresponding to the infrared radiation received from the scene by the unshielded infrared sensor, based on the average thermographic offset reference and a captured signal from the unshielded infrared sensor, and wherein the absolute radiometric value is determined without the use of a shutter. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification