Smoke Detector Interference Detection with Airflow and LiDAR
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Solution Overview
Problem
Current smoke detectors lack the ability to detect interference, such as covering or tampering with their outer housings, which can prevent them from functioning correctly.
Innovation Solution
A circuit with sensing devices, such as a fan, distance sensor, or LiDAR, is integrated into the smoke detector to detect interference by monitoring air flow or distance changes, triggering an alarm when interference occurs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If smoke detectors are installed in public venues, then fire detection capability is improved, but they become vulnerable to interference by covering or tampering with the housing
Solution Approach 1:
The patent applies preliminary action by implementing sensing devices (fan, distance sensor, LiDAR) that continuously monitor the housing environment before interference can prevent smoke detection. The system proactively detects covering or tampering attempts and triggers alarms before the interference can successfully block smoke entry, thus maintaining reliable fire detection capability while preventing the harmful effect of interference.
2Reliability
If sensing devices are added to detect interference, then anti-interference capability is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing sensing devices that serve multiple functions: the fan monitors both air flow for smoke detection and housing coverage status; the distance sensor and LiDAR devices detect both smoke particles and housing tampering. This multi-functionality allows the system to achieve improved anti-interference capability while minimizing the increase in device complexity by reusing existing components for multiple detection purposes.
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 integration of sensing devices effectively alerts users to interference, ensuring the smoke detector's functionality is maintained by activating an alarm when the detector is covered or tampered with.
Implementation Method 1
The sensing devices to determine whether interference has occurred to the smoke detector, for example covering or interfering with the outer housing of the smoke detector can include a fan
Implementation Method 2
The sensing devices to determine whether interference has occurred to the smoke detector, for example covering or interfering with the outer housing of the smoke detector can include a distance sensing device
Implementation Method 3
The sensing devices to determine whether interference has occurred to the smoke detector, for example covering or interfering with the outer housing of the smoke detector can include a LiDAR device
Implementation Method 4
If smoke enters the sensing chamber, the light that is reflected onto the light sensor is interrupted, scattering light in many directions, triggering the alarm
Implementation Method 5
The radioactive source constantly releases alpha particles that knock off the electrons from the surrounding air atoms, thus ionizing the nitrogen and oxygen atoms within the chamber of the housing
Data Source
AI summary
A circuit added to a smoke detector which uses a sensing device to detect interference to smoke detectors. The circuit can be MOSFET circuit or a normally open relay circuit. The sensing devices to determine whether interference has occurred to the smoke detector, for example covering or interfering with the outer housing of the smoke detector can include a fan, a distance sensing device, a LiDAR device or other devices.