IR 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 sensing path, which complicates accurate temperature measurements.
Innovation Solution
The implementation of active and passive temperature stabilization systems using resistive temperature devices (RTDs) and thermal control components to regulate the temperature of key measurement components and intermediate media, such as optical lenses and protective windows, to minimize measurement errors and enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protective housings and intermediate media are installed to protect the sensor from environmental elements, then the sensor is protected from environmental damage, but measurement accuracy deteriorates due to thermal interference and energy blocking
Solution Approach 1:
The patent applies parameter changes by actively controlling and stabilizing the temperature of intermediate media (lens, window, housing) using heating elements and temperature sensors. By maintaining these components at a stable temperature different from ambient conditions, the system compensates for thermal interference effects, allowing accurate IR measurements despite the presence of protective housings.
Solution Approach 2:
The patent introduces temperature-controlled intermediate media (heated lens, window, and housing components) as mediators between the IR sensor and the external environment. These intermediaries are actively heated to compensate for their thermal interference, effectively mediating the measurement process to eliminate errors caused by the protective structure itself.
2Measurement precision
If active temperature stabilization is implemented using RTDs and thermal control components, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent implements feedback control by using temperature sensors (RTDs) to continuously monitor the temperature of intermediate media and adjusting the heating element power accordingly. This closed-loop feedback system automatically stabilizes temperatures, reducing measurement errors while managing system complexity through automated control.
Solution Approach 2:
The system performs self-service temperature stabilization where the temperature control system automatically adjusts heating based on sensor feedback without external intervention. The RTDs and heating elements work autonomously to maintain optimal measurement conditions, reducing the need for external complex control mechanisms.
3Loss of time
If passive temperature stabilization is used through conductive coupling, then response time is reduced, but control precision deteriorates
Solution Approach 1:
The patent merges passive thermal coupling (using conductive materials to transfer heat) with active electronic control (RTDs and heating elements). This combination allows the system to benefit from both fast thermal response through conductive coupling and precise control through electronic temperature regulation, achieving both fast response and high precision.
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, allowing for more accurate and efficient infrared temperature measurements by actively stabilizing critical components and compensating for thermal variations, thereby improving the reliability and speed of temperature readings.
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
One of the most basic IR temperature sensor designs consists of a lens that focuses IR energy onto to a detector
Implementation Method 3
The detector can convert the measured energy to an electrical signal, which can be displayed in units of temperature
Implementation Method 4
other components in the sensing region can be stabilized via RTDs, e.g., sensor housing, baseplate, etc.
Data Source
AI summary
Infrared (IR) temperature measurement and stabilization systems, and methods related thereto are provided. The innovation actively stabilizes temperatures of objects in proximity and within the path between an infrared (IR) sensor and target object. A temperature monitor and controller are employed to regulate power to resistive temperature devices (RTDs) thereby regulating current (and power) to the RTDs. As a result, temperatures of IR visible objects can be actively stabilized for changes, for example, changes in ambient temperatures, resulting in efficient and accurate temperature readings.