Man Down Detector Wireless Pairing False Alarm Reduction
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Solution Overview
Problem
Current man-down detection systems often generate false positive alarms due to lack of movement registration when the safety device is not being worn or is left in a different location, leading to unnecessary disarming and nuisance alarms.
Innovation Solution
Implementing a second wearable device with low power wireless communication to pair with the primary safety device, which includes independent motion sensing capabilities, to confirm the presence of the worker and prevent false alarms by requiring both devices to register no movement for a man-down event.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If motion measuring means is used to detect worker incapacitation, then man-down detection capability is improved, but false positive alarms increase due to device being left in stationary locations
Solution Approach 1:
A wireless communication link acts as an intermediary between the motion measuring means and the alarm system. The system receives wireless signals indicating whether the device is being worn, and uses this intermediary information to validate motion data before triggering false alarms, thereby resolving the contradiction between detection accuracy and false positive reduction
2Ease of operation
If the detector is designed to last a complete shift without turning off, then ease of operation is improved, but false alarms occur when the device is left in lockers or vehicles
Solution Approach 1:
The system implements feedback through wireless communication that continuously reports whether the device is being worn or left stationary. This feedback loop allows the alarm system to distinguish between legitimate man-down events and situations where the device was simply left in a locker or vehicle, maintaining continuous operation while improving alarm accuracy
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
Significantly reduces false positive man-down alarms by ensuring the worker is wearing the safety device and allows easy cancellation of alarms through motion detection, enhancing the reliability of man-down detection.
Implementation Method 1
The worker's movements are measured using an accelerometer or other motion measuring means carried within a first safety device
Data Source
AI summary
A man down indicator includes a gas detector which includes a motion sensor. A separate wearable element also includes a motion sensor. The element is wirelessly coupled to, and paired with, the detector. In responsive to a lack of sensed motion at both detector and the element, a pre-alarm condition is initiated for a predetermined period of time by circuitry carried by one of the detector, or the element. Unless interrupted, when the pre-alarm condition terminates, a man down alarm is generated.