Radiation Sensor Detection Using Adaptive Band-Pass Filtering
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Solution Overview
Problem
Existing methods for detecting the luminous states of radiation sources struggle to reliably distinguish between radiation emitted by the source and background radiation, especially in industrial environments where background radiation can interfere with the detection of active versus inactive states.
Innovation Solution
A method involving learning steps to determine a band-pass filter tailored to the specific radiation source's characteristic spectrum, which is used to differentiate between radiation emitted by the source and background radiation, combined with intensity and color criteria for enhanced detection reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If energy-based sensors are used to detect radiation from a source, then detection capability is provided, but background radiation masks the radiation emitted by the source making active states indistinguishable from inactive states
Solution Approach 1:
The radiation source is modulated in a periodic manner (e.g., pulse-width modulation) to emit radiation in distinct temporal patterns. The detection device uses temporal filtering to identify these periodic patterns, allowing differentiation between source-emitted radiation and constant background radiation. This resolves the contradiction by enabling reliable state detection through temporal modulation rather than relying solely on intensity thresholds.
Solution Approach 2:
The invention changes the temporal parameter of radiation emission by modulating the source periodically. This transforms the detection problem from intensity-based discrimination to pattern-based recognition, where the modulated signal's temporal characteristics serve as a unique identifier that distinguishes source radiation from background radiation regardless of intensity levels.
2Reliability
If intensity-modulated radiation is used to enable detection, then detection reliability improves, but susceptibility to interfering background radiation increases
Solution Approach 1:
Instead of relying on intensity modulation alone, the invention superimposes periodic temporal modulation on the radiation emission. The detection device correlates incoming signals with the known modulation pattern, allowing it to identify source radiation even when intensity varies or background radiation is present. This resolves the contradiction by adding temporal dimension to detection that is insensitive to intensity-based interference.
3Reliability
If a detection device is designed to detect specific color or polarization of radiation, then discrimination from background radiation improves, but adaptability to different radiation sources decreases
Solution Approach 1:
The detection device is designed with universal temporal filtering capability that works with any periodically modulated radiation source regardless of its spectral or polarization characteristics. Rather than configuring filters for specific wavelengths or polarizations, the device detects the universal temporal signature of modulation, making it adaptable to different radiation sources while maintaining discrimination capability through pattern recognition rather than spectral selection.
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 allows for flexible and adaptive detection of radiation sources, reducing interference from background radiation and improving the reliability of distinguishing active from inactive states, even when background radiation intensity matches that of the source.
Implementation Method 1
Energy-based sensors, such as those containing a photodiode, can also be used as detection devices. These sensors convert incident radiation into electrical signals.
Implementation Method 2
determine a band-pass filter tailored to the specific radiation source's characteristic spectrum, which is used to differentiate between radiation emitted by the source and background radiation
Data Source
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AI summary
A method for detecting active luminescence states of radiation sources comprises the learning steps to be performed at least once for each active luminescence state of a given radiation source, as well as the measurement steps to be performed, in particular continuously, for the detection of each active luminescence state of the given radiation source. The learning steps comprise: that, when the radiation source is in an active luminescence state, a first temporal reference profile of the intensity of radiation incident on the radiation sensor is recorded by means of a radiation sensor; that, when the radiation source is in an inactive luminescence state, a second temporal reference profile of the intensity of radiation incident on the radiation sensor is recorded by means of the radiation sensor;that a first reference spectrum is determined by transforming the first reference curve into the frequency domain, and a second reference spectrum is determined by transforming the second reference curve into the frequency domain; that a difference spectrum is determined as the difference between the first and second reference spectra; that a band-pass filter is determined based on the difference spectrum; that a first reference intensity is determined as the mean value of the first reference curve, and a second reference intensity is determined as the mean value of the second reference curve; and that a switching threshold is set based on the first and second reference intensities. The measurement steps include: that a time-dependent measurement profile of the intensity of radiation incident on the radiation sensor is recorded using the radiation sensor; that the measurement profile is filtered using the band-pass filter;and that the filtered measurement profile is evaluated based on the switching threshold.