MEMS Pressure Sensor Window Security Detection

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Solution Overview

Problem

Conventional security systems relying on magnetic reed sensors and accelerometers are inefficient in detecting subtle movements of windows or doors, as they can be easily detected by intruders and may fail to detect slow openings, leading to security vulnerabilities.

Innovation Solution

The integration of MEMS pressure sensors, such as those from TDK/InvenSense, which provide accurate altitude changes, allowing for precise monitoring of window or door positions by measuring pressure differences, enabling detection of intermediate or slow movements that traditional sensors might miss.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If magnetic reed sensors and accelerometers are used to detect window or door movements, then the system can detect obvious intrusions, but it fails to detect slow openings and subtle movements

Engineering Contradiction:

Improvedetection precision of window/door movementVSAvoidsecurity detection reliability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent replaces magnetic reed sensors and accelerometers with pressure sensors that measure atmospheric pressure changes. This substitution enables detection of slow and subtle movements by detecting pressure differential changes caused by window/door movement, thereby improving both measurement precision and security detection reliability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the detection parameter from magnetic field strength or acceleration to atmospheric pressure differential. By measuring pressure changes rather than magnetic or mechanical movements directly, the system can detect subtle and slow openings that previous sensors missed, resolving the contradiction between detection precision and reliability.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If conventional sensors are used, then the system structure remains simple, but false negatives increase and security coverage is insufficient

Engineering Contradiction:

Improveintrusion detection accuracyVSAvoidsensor system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces complex multi-sensor systems (magnetic sensors + accelerometers) with a simpler pressure sensor-based system. This substitution reduces device complexity while improving intrusion detection accuracy by eliminating false negatives associated with conventional sensors.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If pressure sensors are integrated into the security system, then detection of slow and intermediate movements is enabled, but the system complexity increases

Engineering Contradiction:

Improveposition measurement precisionVSAvoidsensor integration complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent makes the pressure sensor serve multiple functions: detecting window/door position, measuring pressure differentials, and providing security alerts. This multi-functionality justifies the added system complexity by delivering comprehensive detection capabilities that conventional sensors cannot achieve.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent substitutes complex mechanical detection systems with pressure sensors that indirectly measure position through pressure differentials. This substitution improves position measurement precision for slow and intermediate movements while the added complexity is offset by the superior detection capabilities enabled by the pressure-based approach.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 solution enhances the security and power efficiency of building monitoring systems by accurately tracking the position of windows or doors, reducing false negatives and improving intrusion detection through precise pressure-based measurements.

Implementation Method 1

Pressure sensors may be used in a wide variety of applications to measure relative or absolute altitude through the analysis of changes in the atmospheric pressure

Methodology Applied

Scientific EffectAtmospheric pressure measurement:

Implementation Method 2

The development of microelectromechanical systems (MEMS) and MEMS sensors has enabled the incorporation of a wide variety of small sensors into various structures and/or devices

Methodology Applied

Scientific EffectMEMS pressure sensing:

Data Source

PatentUS10593176B2Using pressure sensors in a security system

Publication Date: 2020.03.17 INVENSENSE INC

AI summary

A security system for a building comprises a pressure sensor and a computer system communicatively coupled with the pressure system. The pressure sensor coupled to a movable portion of a window in the building. The computer system is configured to: receive a first pressure measurement from the pressure sensor; compare the first pressure measurement to a reference pressure measurement; and based on the comparison, detect that the movable portion of the window has moved.