Fork-Shaped Quartz Tines for Torsional Temperature Sensing Stability
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Solution Overview
Problem
Existing quartz crystal oscillators lack high sensitivity and linearity in temperature sensing, and are prone to amplitude noise, limiting their effectiveness in temperature measurement applications.
Innovation Solution
A fork-shaped quartz crystal device configured for temperature sensing, featuring elongate tines with vertically protruding line structures and electrodes that vibrate in a torsional mode, allowing for precise temperature detection with improved frequency stability and reduced noise immunity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional quartz crystal oscillators are used for temperature sensing, then frequency stability is maintained, but sensitivity and linearity in temperature sensing are insufficient
Solution Approach 1:
The quartz crystal is divided into a fork-shaped structure with two separate tines that vibrate independently in torsional mode. This segmentation allows the crystal to exhibit enhanced temperature sensitivity while maintaining frequency stability, as each tine contributes to the overall resonant response without the amplitude noise issues of conventional single-crystal oscillators.
Solution Approach 2:
The invention utilizes torsional mechanical vibration mode where the fork-shaped quartz crystal twists about its longitudinal axis. This specific vibration mode provides both high temperature sensitivity for precise measurement and inherent frequency stability, resolving the contradiction between measurement precision and reliability in temperature sensing applications.
2Measurement precision
If conventional quartz crystal oscillators are used, then basic temperature detection is possible, but amplitude noise reduces measurement effectiveness
Solution Approach 1:
By employing torsional vibration mode instead of conventional flexural or thickness modes, the quartz fork oscillator produces minimal amplitude variations during operation. The twisting motion about the longitudinal axis inherently suppresses amplitude noise, enabling accurate temperature measurements without the harmful amplitude fluctuations that plague conventional oscillator designs.
Solution Approach 2:
The invention exploits the relationship between temperature and resonant frequency, where temperature changes cause measurable shifts in the crystal's natural frequency. By monitoring frequency rather than amplitude, the system achieves noise-immune temperature sensing, as frequency measurements are not affected by amplitude variations.
3Measurement precision
If high temperature sensitivity is achieved, then fine temperature changes can be detected, but linearity in temperature sensing is reduced
Solution Approach 1:
The fork-shaped structure with two symmetric tines provides balanced mechanical properties that ensure linear relationship between temperature and frequency across a wide range. The segmented design allows each tine to contribute equally to the resonant frequency, maintaining linearity even as sensitivity increases for detecting fine temperature changes.
Solution Approach 2:
The invention achieves both high sensitivity and linearity by optimizing the geometric parameters of the fork-shaped crystal, including tine length, width, and spacing. By carefully controlling these dimensions, the device maintains a linear frequency-temperature relationship while exhibiting high sensitivity to temperature variations, resolving the contradiction between detection precision and measurement linearity.
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
The fork-shaped quartz crystal device achieves high sensitivity and linearity in temperature sensing, enabling fine temperature changes detection and immune to amplitude noise, making it suitable for precise temperature measurement.
Implementation Method 1
A quartz crystal oscillator vibrates at a stable frequency by being distorted by an electric field when voltage is applied to an electrode near or on the crystal. This property is known as electrostriction or inverse piezoelectricity.
Implementation Method 2
When the field is removed, the quartz, which oscillates in a precise frequency, generates an electric field as it returns to its previous shape, which in turn can generate a voltage.
Data Source
AI summary
The disclosed technology generally relates to quartz crystal devices and more particularly to quartz crystal devices configured to vibrate in torsional mode. In one aspect, a quartz crystal device configured for temperature sensing comprises a fork-shaped quartz crystal comprising a pair of elongate tines laterally extending from a base region in a horizontal lengthwise direction of the fork-shaped quartz crystal. Each of the tines has formed on one or both of opposing sides thereof a vertically protruding line structure laterally elongated in the horizontal lengthwise direction. The quartz crystal device further comprises a first electrode and a second electrode formed on the one or both of the opposing sides of each of the tines and configured such that, when an electrical bias is applied between the first and second electrodes, the fork-shaped quartz crystal vibrates in a torsional mode in which each of the tines twists about a respective axis extending in the horizontal lengthwise direction.