RF Filter for Temperature Measurement in Electromagnetic Noise
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Solution Overview
Problem
Temperature measurement in electromagnetically noisy environments, such as near electronic appliances emitting RF energy, is challenging due to electromagnetic interference (EMI) that can damage sensors or reduce accuracy.
Innovation Solution
A system with an RF filter allowing infrared radiation to pass through while blocking RF frequencies, coupled with an electromagnetic shielding to create an EMI-free space for temperature sensing, enabling contactless temperature measurement of objects in noisy environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is placed in an electromagnetically noisy environment to measure temperature, then temperature measurement capability is achieved, but the sensor accuracy deteriorates due to electromagnetic interference
Solution Approach 1:
An RF filter is introduced as an intermediary component between the electromagnetically noisy environment and the temperature sensor. The filter allows infrared radiation to pass through to the sensor while blocking RF electromagnetic interference, enabling accurate temperature measurement without direct exposure to harmful EM fields.
Solution Approach 2:
The harmful RF electromagnetic interference is extracted and removed from the path between the target object and the temperature sensor by using the RF filter to selectively block RF frequencies while allowing infrared radiation to reach the sensor.
2Reliability
If electromagnetic shielding is used to protect the sensor from RF interference, then sensor protection is improved, but the ability to measure temperature deteriorates due to blocked infrared radiation
Solution Approach 1:
The RF filter provides selective filtering with different properties for different types of radiation: it blocks RF electromagnetic waves to protect the sensor while allowing infrared radiation to pass through for temperature measurement. This local quality differentiation resolves the contradiction between protection and measurement capability.
3Measurement precision
If a traditional temperature sensor is used in an RF cavity to monitor temperature, then temperature monitoring is achieved, but the device complexity increases due to additional shielding and filtering requirements
Solution Approach 1:
The RF filter and electromagnetic shielding are merged into a single integrated component structure. The filter housing serves both as the RF blocking shield and as the mounting structure for the temperature sensor, reducing overall device complexity while maintaining temperature monitoring capability in RF cavities.
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 solution effectively measures temperatures in electromagnetically noisy spaces without interference, ensuring accurate readings and protecting sensors from damage, thereby improving measurement reliability and precision.
Implementation Method 1
an RF filter configured to allow propagation of IR radiation through the filter
Implementation Method 2
configured so that propagation of the various frequencies through the filter is substantially unsupported
Implementation Method 3
a temperature sensor operative to measure the temperature of an object based on the amount of infrared (IR) radiation that propagates through the filter
Implementation Method 4
The temperature sensor is arranged in an EMI-free space created by an electromagnetic shielding
Data Source
AI summary
Disclosed is a system for dielectrically processing a product in a radio frequency (RF) cavity. The system may include a cavity; an RF feeding module that includes a plurality of radiating elements configured to feed RF radiation into the cavity, and a plurality of dummy loads for receiving RF energy coupled from the cavity into the radiating elements; and the system includes a processor configured to (a) estimate an effect operating the system at each of a plurality of sets of operating parameters will have on the temperature of each of the dummy loads; (b) choosing among the plurality of sets of operating parameters at least one set based on the estimation; and (c) controlling the system to operate at the chosen at least one set of operating parameters.