Gas Sensor Batch Screening Using Correlated Electrical Tests

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Solution Overview

Problem

Existing methods for testing environmental sensors, such as gas sensors, humidity sensors, and pressure sensors, are costly and not suited for high-volume production due to the need for extensive gas testing and specialist equipment, making them inefficient for large-scale manufacturing.

Innovation Solution

Applying tailored electrical test techniques and wafer film frame handling to strip packaged parts, using automated test equipment to perform electrical tests that correlate with environmental conditions, allowing for the determination of electrical test limits without direct environmental testing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If extensive gas testing and specialist test equipment are used to screen gas sensors, then measurement precision and reliability are improved, but productivity decreases and manufacturing cost increases

Engineering Contradiction:

Improvesensor performance measurementVSAvoidproduction throughput

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The patent creates a correlation model that copies the relationship between electrical parameters and environmental performance. By establishing that specific electrical test results correlate with sensor performance under environmental conditions, the system uses electrical test data as a substitute for actual environmental testing, enabling high-volume screening without specialist equipment

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The patent replaces mechanical/environmental testing systems with electrical testing systems. Instead of exposing sensors to actual environmental conditions (gas, humidity, pressure), the system applies electrical impulses and measures electrical responses, substituting a simpler electrical measurement system for complex environmental testing apparatus

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If extensive gas testing and specialist test equipment are used to screen gas sensors, then measurement precision and reliability are improved, but manufacturing cost increases

Engineering Contradiction:

Improvesensor performance measurementVSAvoidmanufacturing cost

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The patent employs standard automated test equipment and common electrical measurement tools instead of expensive, specialized environmental test chambers. By using readily available, inexpensive testing equipment that can be easily replaced or upgraded, the system achieves cost-effective high-volume sensor screening

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Measurement precision

If environmental testing is performed on each sensor in the batch, then measurement precision is improved, but loss of time increases

Engineering Contradiction:

Improvesensor performance verificationVSAvoidtesting duration

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent performs preliminary electrical testing on all sensors in the batch before any environmental verification. By establishing correlation models upfront that link electrical responses to environmental performance, the system can quickly screen entire batches using only electrical tests, reserving time-consuming environmental testing for validation purposes only

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies electrical testing to all sensors in the batch (excessive action) while performing environmental testing on only a subset for correlation validation (partial action). This approach ensures comprehensive screening efficiency while maintaining measurement precision through targeted environmental verification

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentEP4089410B1An environmental sensor test methodology

Publication Date: 2025.12.17 SCIOSENSE BV

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AI summary

A method for testing a batch of gas sensors to determine the fitness for purpose of the batch of gas sensors, the method comprising: performing a plurality of electrical test sequences to the heater inputs of the batch of gas sensors to measure electrical responses of the sensor outputs of the batch of gas sensors; for at least one gas sensor correlating measured electrical responses to measured environmental responses so as to define correlated electrical test limits; and determining the fitness for purpose of the batch of gas sensors if the measured electrical responses are within the correlated electrical test limits.