Ultrasonic Protected-Area Alarm With Delayed Object Detection
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Solution Overview
Problem
Existing facilities face challenges in maintaining protected areas free of objects due to non-compliance with federal, state, or local regulations, with current methods like colored tape or paint being ineffective, and there is a need for a sensor that can detect objects and alert personnel after a reasonable transition period.
Innovation Solution
An object detection alarm system using ultrasonic sensors and a microcontroller to monitor protected areas, emitting sonar signals, calculating time differentials, and triggering an alarm after a predetermined period of object presence, ensuring compliance with regulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If colored tape or paint is used to mark protected areas, then the visual alert function is provided, but the effectiveness in preventing object placement remains limited
Solution Approach 1:
The patent replaces passive visual markers (colored tape/paint) with an active electronic sensor system that uses ultrasonic waves to detect objects. The ultrasonic sensor emits sound waves and measures the time differential of reflected waves to automatically detect when objects are placed in protected areas, transforming a static visual warning system into a dynamic detection system with actual compliance enforcement capability.
2Speed
If an alarm is triggered immediately upon detecting an object, then rapid alerting is achieved, but unnecessary alarms are caused by transitional objects and personnel
Solution Approach 1:
The patent implements a delay mechanism that prevents immediate alarm activation. Instead of triggering an alarm the moment an object is detected, the system waits for a predetermined time period to elapse while continuously monitoring. Only if the object remains in the protected area after the delay does the alarm activate. This preliminary waiting period allows transitional objects and personnel to move through naturally, filtering out false alarms before they occur.
3Measurement precision
If continuous monitoring is implemented without delay, then object presence is detected immediately, but false alarms are generated during normal transitions
Solution Approach 1:
The patent introduces temporal dynamics to the detection system by implementing a time-based filtering mechanism. The system continuously monitors object presence but dynamically adjusts its response based on duration - objects that appear and disappear within the delay period are ignored, while objects that persist beyond the delay threshold trigger an alarm. This dynamic approach maintains high detection precision while eliminating false alarms from transient objects.
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 system effectively maintains protected areas clear by alerting personnel only after a delay, ensuring compliance with regulations and creating a safer environment.
Implementation Method 1
The ultrasonic sensor is provided to monitor a protected area, and cyclically emits sonar signals which reflect off of a ground surface or object present in the protected area, and detects the signals so reflected
Implementation Method 2
The sensor then calculates time differentials between emitted and detected sonar signals and generates signals representing the calculated time differential values
Data Source
AI summary
An object detection alarm system is provided for monitoring a protected area within a facility to ensure that it remains free of objects in accordance with federal, state, or local regulations or facility protocol. The system includes a housing supporting an ultrasonic sensor, a microcontroller, an alarm and a clock module. The sensor calculates time differentials between emitted and detected sonar signals and generates signals representing the calculated time differential values or a calculated distance based thereon, supplying those signals to a processor of the microcontroller which determines whether a violative condition is present based upon a comparison of the received signals and a pre-determined time differential value representing a non-violative condition. If a violative condition is determined, and persists for a period of time, the microprocessor activates an alarm until the condition is cleared. Also provided is a method of monitoring a protected area within a facility by means of an object detection alarm system as herein provided.