Gas Sensor Element Diffusion Resistance Layer Laser Processing
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Solution Overview
Problem
Existing methods for producing gas sensor elements fail to consistently maintain a desired detection value, leading to variations in sensor performance due to uncontrolled physical properties of the diffusion resistance layer.
Innovation Solution
A method involving a temperature raising step, current measuring step, and control step is implemented, where an ultrashort pulsed laser is used to adjust the diffusion length of the diffusion resistance layer to maintain the limiting current within a predetermined range, ensuring consistent detection values across gas sensor elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the diffusion resistance layer is left unprocessed with conventional methods, then the manufacturing process is simple, but the detection value varies between sensor elements
Solution Approach 1:
The patent replaces conventional mechanical or chemical processing methods with laser beam processing to control the diffusion resistance layer. The laser beam enables precise control of the diffusion length without complex mechanical tooling or chemical processing steps, thereby improving detection value consistency while avoiding increased processing complexity
Solution Approach 2:
The patent changes the physical parameters of the diffusion resistance layer by using laser processing to control the diffusion length. By adjusting laser parameters (energy, duration, focus), the diffusion resistance and diffusion length are precisely controlled, ensuring consistent detection values across sensor elements without complicating the overall manufacturing process
2Manufacturing precision
If the diffusion length is not controlled, then the manufacturing process is fast, but the limiting current varies outside the predetermined range
Solution Approach 1:
The patent uses laser beam processing to rapidly and precisely control the diffusion length in the diffusion resistance layer. The laser method eliminates the need for slow mechanical machining or multi-step chemical processes, achieving both high manufacturing precision and maintained productivity
Solution Approach 2:
The patent performs preliminary laser processing of the diffusion resistance layer to establish the correct diffusion length before final sensor assembly and testing. This preliminary action ensures that the limiting current will be within the predetermined range, preventing the need for rework or adjustment later in the production process
3Manufacturing precision
If conventional processing methods are used, then the equipment is simple, but the physical properties of the diffusion resistance layer cannot be controlled
Solution Approach 1:
The patent replaces simple but ineffective conventional processing equipment with laser processing equipment. The laser system provides precise control over the physical properties of the diffusion resistance layer (diffusion length, resistance) without requiring complex mechanical tooling, chemical processing systems, or multiple processing stations
Solution Approach 2:
The patent uses laser parameters (energy density, pulse duration, scanning speed) to control the physical properties of the diffusion resistance layer. By adjusting these parameters, the diffusion length and resistance are precisely controlled, achieving manufacturing precision without requiring complex equipment configurations
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 reduces variation in detection values between gas sensor elements by precisely controlling the diffusion length using an ultrashort pulsed laser, ensuring accurate and reliable ion concentration measurements.
Implementation Method 1
a part of a diffusion resistance layer is removed from the gas sensor element by using an ultrashort pulsed laser
Implementation Method 2
the heater is energized to raise the temperature of the solid electrolyte is raised
Implementation Method 3
The solid electrolyte layer can conduct specific ions in a measurement gas
Implementation Method 4
The diffusion resistance layer, which permits a measurement gas to permeate therethrough
Data Source
AI summary
There is provided a method of producing a gas sensor element capable of detecting a concentration of specific ions based on a limiting current passing between a first electrode and a second electrode according to a concentration difference of the specific ions. The method includes a temperature raising step, a current measuring step and a control step. In the temperature raising step, a heater is energized to raise temperature of a solid electrolyte. In the current measuring step, a voltage is applied across the first and second electrodes and to measure a limiting current. In the control step, a part of a diffusion resistance layer is removed from the gas sensor element by using an ultrashort pulsed laser to control a diffusion length that is a length of an introduction path to maintain the limiting current to be within a final standard range.