Intrusion Detection System With Laser Diode Temperature Compensation
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Solution Overview
Problem
Intrusion detection systems using optical fiber lines face erroneous detection due to changes in environmental conditions such as temperature and wind, which can lead to inaccurate monitoring and increased maintenance costs.
Innovation Solution
The system employs a laser diode and photodiode with temperature and environmental variable measurement units to compare waveforms and reset reference waveforms based on allowable ranges, minimizing erroneous detection by adjusting for temperature and environmental changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical fiber line is used for intrusion detection, then monitoring accuracy and location specification are improved, but erroneous detection due to environmental changes (temperature, wind) occurs
Solution Approach 1:
The system performs preliminary actions by measuring temperature and environmental variables before intrusion detection, storing these baseline values for later comparison. This allows the system to distinguish between normal environmental variations and actual intrusion events, reducing false alarms while maintaining detection accuracy.
Solution Approach 2:
The system implements feedback mechanisms by continuously monitoring temperature and environmental conditions, comparing current measurements against stored baseline values, and adjusting detection thresholds accordingly. This feedback loop enables the system to adapt to environmental changes and maintain reliable intrusion detection accuracy.
2Measurement precision
If temperature compensation is implemented for laser diode and photodiode, then detection accuracy is improved, but system complexity increases
Solution Approach 1:
The system performs self-service by automatically measuring its own temperature and environmental conditions, comparing against stored baselines, and adjusting detection parameters without external intervention. This self-adjusting capability improves detection accuracy while avoiding the need for complex external compensation systems.
Solution Approach 2:
The system changes detection parameters dynamically based on measured temperature and environmental conditions. By adjusting detection thresholds and comparison criteria according to environmental parameters, the system maintains high accuracy without requiring complex hardware modifications or additional compensation components.
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 approach enhances the accuracy of intrusion detection by reducing false alarms caused by environmental fluctuations, thereby improving the reliability and efficiency of the optical fiber-based intrusion monitoring system.
Implementation Method 1
a laser diode inputting an optical signal to the optical fiber line
Implementation Method 2
a photodiode detecting a reflected optical signal when the optical signal is reflected from the optical fiber line
Implementation Method 3
a photodiode detecting a reflected optical signal when the optical signal is reflected from the optical fiber line
Data Source
AI summary
An intrusion detecting method using an intrusion detecting system which includes an optical fiber line installed in an area in which intrusion is to be detected, a laser diode inputting an optical signal to the optical fiber line, a photodiode detecting a reflected optical signal when the optical signal is reflected from the optical fiber line, an intrusion determining unit comparing a waveform of the reflected optical signal detected by the photodiode with a set reference waveform to determine whether an intrusion has occurred, and a laser diode temperature measuring unit measuring a temperature of the laser diode, includes designating, by the intrusion determining unit, a temperature of the laser diode at a first point in time as a first temperature and setting, to a reference waveform, a waveform of a first reflected optical signal caused by an input optical signal input by the laser diode at the first point in time, designating, by the intrusion determining unit, a temperature of the laser diode at a second point in time after the first point in time as a second temperature and determining whether the second temperature is within an allowable range with respect to the first temperature, and when it is determined that the second temperature exceeds the allowable range, resetting, by the intrusion determining unit, to the reference waveform, a waveform of a second reflected optical signal caused by an input optical signal input by the laser diode at the second point in time.