Infrared Sensor Thermal Stabilization via Active RTD Control
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Solution Overview
Problem
Conventional infrared temperature sensors face significant measurement errors due to thermal conditions such as wide temperature ranges, temperature rate changes, and static thermal gradients, as well as interference from IR-visible objects in the measurement path, leading to inaccurate and inefficient temperature readings.
Innovation Solution
The implementation of active temperature stabilization systems using resistive temperature devices (RTDs) and temperature control components, which regulate power to stabilize key measurement components and intermediate media, such as optical lenses and protective windows, to compensate for thermal variations and reduce measurement errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protective housings and intermediate media are used to protect the IR sensor from environmental elements, then the sensor is protected from damage, but these materials contribute to IR energy path interference and make accurate temperature measurements difficult
Solution Approach 1:
The patent introduces an active temperature stabilization system with heating elements and temperature sensors as intermediary components between the protective housing and the IR sensor. These intermediaries actively control the thermal environment, compensating for the interference caused by the protective housing materials and enabling accurate measurements despite the presence of protective elements in the IR path.
Solution Approach 2:
The system dynamically changes the temperature parameter of the protective housing and intermediate media through active heating and cooling control. By maintaining these components at a stable, controlled temperature, the system prevents thermal gradients and IR radiation interference, thereby resolving the contradiction between protection and measurement accuracy.
2Device complexity
If the IR sensor operates in a wide temperature range without active stabilization, then the device complexity is reduced, but significant measurement errors occur due to thermal conditions and temperature rate changes
Solution Approach 1:
The patent implements a feedback control system where temperature sensors continuously monitor the thermal state of the protective housing and intermediate media, and this information feeds back to the heating/cooling control circuitry. This closed-loop feedback mechanism automatically adjusts the thermal stabilization, ensuring measurement accuracy without requiring complex manual intervention or oversimplified passive designs.
Solution Approach 2:
The active temperature stabilization system provides self-service by automatically regulating its own thermal environment. The system monitors its own temperature conditions and autonomously adjusts heating and cooling to maintain optimal thermal stability, eliminating the need for external thermal management and reducing overall system complexity despite the added active components.
3Device complexity
If passive compensation methods are used for ambient temperature variations, then the system remains simple, but accurate measurement of target objects is compromised under significant thermal conditions
Solution Approach 1:
The patent introduces active temperature control components as intermediaries between the ambient environment and the IR sensor assembly. These intermediaries (heating elements, cooling elements, and temperature sensors) actively mediate the thermal conditions, providing precise compensation that goes beyond simple passive methods while maintaining a relatively compact and integrated system design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces measurement errors and response times, providing more accurate and efficient temperature readings by actively stabilizing critical components and intermediate media, thus enhancing the accuracy and speed of infrared temperature measurements.
Implementation Method 1
A temperature monitor and controller is employed to regulate power to resistive temperature devices (RTDs) thereby regulating current (and power) to the RTDs
Implementation Method 2
Infrared (IR) temperature sensors can monitor infrared light which is then converted into an electrical signal and ultimately to a temperature reading
Implementation Method 3
One of the most basic IR temperature sensor designs consists of a lens that focuses IR energy onto to a detector
Data Source
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AI summary
Infrared (IR) temperature measurement and stabilization systems, and methods related thereto are provided. One or more embodiments passively stabilizes temperatures of objects in proximity and within the path between an infrared (IR) sensor and target object. A protective housing may encase an I R sensor, which may include a sensing element or IR element, a circuit or signal processor, and a housing seal plug. The IR element may be thermally bonded with a frame or conductive top hat.