Laser Radiation Detection Device Using Frequency Modulation
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Solution Overview
Problem
Existing devices for detecting laser radiation are limited in detecting radiation from different sources and cannot protect against laser exposure when not used through optical instruments, as they primarily detect directly incident radiation and require knowledge of incoming wavelengths, leading to reduced visibility and inability to detect scattered or reflected low-intensity laser radiation.
Innovation Solution
A device with a light entrance and a photoelectric converter that monitors a larger solid angle for coherent, monochromatic, or polarized laser radiation, using a modulator to selectively modulate laser radiation with a specific frequency, allowing detection of reflected or scattered radiation with improved sensitivity through a lock-in amplifier, frequency analyzer, or correlation methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If selective filtering is used to detect laser radiation, then detection specificity is improved, but visibility of the user is impaired due to removal of visible light
Solution Approach 1:
The detection system is segmented into multiple independent detectors, each tuned to different wavelength ranges. This allows simultaneous detection of various laser wavelengths without requiring a single broadband filter that would block visible light.
Solution Approach 2:
A modulator is introduced as an intermediary component between the light source and detector. It modulates laser radiation at a specific frequency, enabling selective detection through frequency analysis without requiring wavelength-selective filters that would impair visibility.
2Device complexity
If the device monitors only directly incident radiation, then detection simplicity is maintained, but detection capability is limited to specific geometries
Solution Approach 1:
The detector is designed with a wide field of view and the modulator can detect laser radiation from any direction within this field. This universal detection capability allows the system to detect both directly incident and scattered/reflected radiation without requiring multiple specialized sensors.
Solution Approach 2:
The system transitions from detecting only direct line-of-sight radiation to detecting radiation scattered into a larger solid angle. This dimensional expansion in detection space allows capture of reflected and scattered laser light while maintaining a single detector configuration.
3Adaptability or versatility
If broadband protective filter is used, then protection against multiple laser sources is achieved, but visible light transmission is reduced
Solution Approach 1:
The modulator serves as an intermediary that selectively modulates laser radiation at a characteristic frequency. This allows the detector to distinguish laser signals from ambient light without requiring broadband optical filters that would attenuate visible light transmission.
Solution Approach 2:
The system changes the detection parameter from wavelength-based filtering to frequency-based detection. By detecting the modulation frequency characteristic of laser radiation rather than filtering specific wavelengths, the system achieves broadband laser detection while maintaining full visible light transmission.
4Ease of manufacture
If the device is built into optical instruments, then integrated protection is achieved, but protection is unavailable when not in use
Solution Approach 1:
The detection device is designed as a standalone unit with its own light inlet, modulator, and detector components. This universal configuration allows the device to function independently without requiring integration into optical instruments, while still providing protection capability.
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
Enables detection of laser radiation from various sources, including reflected and scattered radiation, even at low intensities, providing enhanced protection against harmful laser exposure without the need for direct incidence or knowledge of the laser source's properties, and can be used independently of optical instruments.
Implementation Method 1
a photoelectric transducer configured to convert electromagnetic radiation arriving through the light inlet into an electrical signal
Implementation Method 2
A modulator is arranged between the light source and the photoelectric transducer. The modulator is designed to modulate laser radiation at a modulation frequency.
Data Source
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AI summary
The invention relates to a device (1) for detecting laser radiation (45), comprising at least one light inlet (51) and at least one photoelectric transducer (5), which is designed to convert electromagnetic radiation (46) entering through the light inlet (51) into an electrical signal, wherein a modulator (4) is arranged in the beam path between the light inlet (51) and the photoelectric transducer (5), which modulator is designed to modulate laser radiation at a specifiable modulation frequency. The invention further relates to a corresponding method.