Integrated Surface Acoustic Wave Temperature Sensor for Narrow Spaces
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Solution Overview
Problem
Existing surface acoustic wave temperature sensors have a large volume due to separate sensing and antenna modules, making them unsuitable for high-temperature and narrow-space environments.
Innovation Solution
Integration of a sensing module and antenna module with a high-temperature-resistant substrate, featuring a patterned antenna and recess structure, and use of high-temperature-resistant materials like HTCC and langasite substrates to reduce volume and enhance temperature resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the sensing module and antenna module are separated with traditional dipole antenna structures, then the sensor can perform wireless passive temperature monitoring, but the volume becomes large and cannot be applied in narrow space environments
Solution Approach 1:
The patent merges the sensing module and antenna module into a single integrated structure where the antenna is directly formed on the same substrate as the sensing elements. This integration eliminates the need for separate antenna modules and reduces the overall device volume while maintaining wireless passive temperature monitoring functionality.
Solution Approach 2:
The patent transitions from traditional three-dimensional dipole antenna structures to a planar integrated antenna design formed on the substrate surface. This dimensional change allows the antenna to be compact and flat, reducing the device volume while still providing effective wireless signal transmission for temperature monitoring.
2Measurement precision
If traditional wired active devices are used, then temperature measurement can be achieved, but they cannot be applied in high temperature and narrow and airtight environments
Solution Approach 1:
The patent replaces traditional wired active devices with a wireless passive sensing system. The surface acoustic wave sensor detects temperature changes and modulates the resonance frequency of acoustic waves, which are then transmitted wirelessly via the integrated antenna. This eliminates mechanical connections and electronic components that would fail in high-temperature environments.
Solution Approach 2:
The patent utilizes the temperature-dependent resonance frequency of surface acoustic waves as the sensing mechanism. As temperature changes, the resonance frequency shifts in a predictable manner, enabling precise temperature measurement. This physical parameter change provides inherent stability and reliability in severe environments without requiring complex electronic circuits.
3Ease of operation
If the antenna module uses dipole antenna structures, then wireless signal transmission can be achieved, but the device complexity and volume increase
Solution Approach 1:
The patent combines the antenna function with the sensing module by forming the antenna elements directly on the same substrate. This merging eliminates the need for separate antenna modules, reducing device complexity while maintaining wireless signal transmission capability.
Solution Approach 2:
The integrated substrate serves multiple functions simultaneously: it acts as the mounting platform for the sensing elements, provides the dielectric medium for acoustic wave propagation, and serves as the ground plane and structural support for the antenna elements. This multi-functionality reduces the number of separate components and simplifies the overall device structure.
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
Enables wireless passive temperature monitoring in high-temperature and narrow-space environments with reduced size and improved high-temperature resistance, facilitating batch processing and efficient signal transmission.
Implementation Method 1
a surface acoustic wave technology can implement wireless passive monitoring of long-distance sensor signals
Implementation Method 2
The antenna module includes a first high-temperature-resistant substrate and a patterned antenna formed on a surface of the first high-temperature-resistant substrate
Data Source
AI summary
The present disclosure discloses a surface acoustic wave temperature sensor and a manufacturing method thereof. The surface acoustic wave temperature sensor includes a sensing module and an antenna module electrically connected to each other. The antenna module includes a first high-temperature-resistant substrate and a patterned antenna formed on a surface of the first high-temperature-resistant substrate, a recess is formed in a first surface of the first high-temperature-resistant substrate, and the sensing module is fixed in the recess. The sensing module and the antenna module of the surface acoustic wave temperature sensor provided by the present disclosure form a whole. Therefore, compared with the prior art, the volume is greatly reduced, and wireless passive temperature monitoring in a high-temperature and narrow space can be better implemented. Moreover, the sensing module can be integrated in the antenna module, and such a structure is more convenient for batch processing.