Quartz Resonator Humidity Compensation for Frequency Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Piezoelectric resonator components experience a decrease in resonant frequency when used in high-humidity environments due to the reaction of vibration electrodes with water, leading to increased weight and reduced vibration efficiency.
Innovation Solution
A piezoelectric resonator unit with a liquid-tightly sealed enclosure and an adjustment member made of a material that volatilizes with increasing humidity, counteracting the weight increase by reducing the adjustment member's weight and maintaining resonant frequency stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the piezoelectric resonator is used in a high-humidity environment, then the vibration electrodes react with water and increase in weight, but the resonant frequency decreases
Solution Approach 1:
The invention utilizes the harmful effect of humidity by incorporating a humidity compensation weight made of hygroscopic material that absorbs moisture from the environment. As the humidity increases, the compensation weight gains weight through moisture absorption, which compensates for the weight increase of the vibration electrodes reacting with water, thereby maintaining resonant frequency stability
Solution Approach 2:
The invention changes the physical-chemical parameters of the compensation weight material to be hygroscopic, allowing its mass to vary with environmental humidity. This parameter change enables the compensation weight to dynamically adjust its mass in response to humidity changes, counteracting the frequency drift caused by electrode weight increase
2Object-affected harmful factors
If the piezoelectric resonator is sealed to protect from humidity, then the vibration electrodes are protected, but the resonant frequency still decreases due to internal humidity reaction
Solution Approach 1:
The invention places a humidity compensation weight inside the sealed enclosure that intentionally absorbs moisture that penetrates through the seal or is present in the enclosed atmosphere. The compensation weight converts the harmful moisture into beneficial mass increase that counterbalances the electrode weight increase, maintaining frequency stability even within the sealed environment
3Reliability
If an adjustment member is added to compensate for frequency drift, then the resonant frequency stability improves, but the device complexity increases
Solution Approach 1:
The invention employs a self-regulating compensation mechanism where the hygroscopic compensation weight automatically adjusts its mass based on environmental humidity conditions. The system serves itself by utilizing the environmental humidity to drive the compensation process, eliminating the need for external control systems, actuators, or complex adjustment mechanisms
Solution Approach 2:
The invention changes the material parameter of the compensation weight to be hygroscopic, allowing automatic mass variation with humidity. This simple parameter change in material selection creates a passive, self-adjusting compensation system that maintains frequency stability without adding mechanical complexity or control systems
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 solution effectively suppresses the decrease in resonant frequency by allowing the adjustment member to volatilize and discharge, thereby maintaining the resonant frequency stability even in high-humidity conditions.
Implementation Method 1
an adjustment member on the piezoelectric resonator and that includes a material whose volatilization amount per unit time and unit volume increases as humidity increases
Data Source
AI summary
A quartz crystal resonator unit that includes a substrate, a lid, and an adhesive member that joins the substrate and the lid to each other to form an enclosure; a quartz crystal resonator disposed in the enclosure; and an adjustment member on the quartz crystal resonator and that includes a material whose volatilization amount per unit time and unit volume increases as humidity increases.