Unstabilized Laser Gas Leak Detector with Wavelength Hopping Mitigation
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Solution Overview
Problem
Conventional gas leak detection techniques are inadequate for compact, handheld devices due to limitations such as ineffective absorption in thermal IR range, weak image contrast, and the need for bulky cooling components in stabilized lasers, which restrict their use in confined spaces like airplane fuselages.
Innovation Solution
A compact handheld gas leak imaging system utilizing an unstabilized laser and a thermal imaging camera with wavelength hopping mitigation and power density reduction techniques, allowing for detection of gases like sulfur hexafluoride in space-confined applications, featuring a diverging lens for beam expansion and integrated circuitry for resonance detection and power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stabilized laser is used for gas leak detection, then detection reliability is improved, but device size and weight increase due to cooling components
Solution Approach 1:
The patent removes the stabilization system and cooling components from the laser device, extracting only the essential laser function. This allows the device to be handheld while maintaining detection capability through alternative wavelength selection methods that do not require thermal stabilization.
Solution Approach 2:
The patent employs a simple, inexpensive unstabilized laser diode that can be easily replaced if needed, rather than investing in a complex stabilized laser system with cooling mechanisms. This approach prioritizes portability and cost-effectiveness over long-term reliability.
2Measurement precision
If absorption techniques are used in thermal IR range, then gas detection capability is improved, but image contrast becomes weak when background temperature is similar to target gas temperature
Solution Approach 1:
The patent changes the operating wavelength parameter to match specific absorption lines of the target gas (SF6 at 10.5-10.7 microns) rather than using general thermal IR absorption. This selective wavelength approach enhances contrast by exploiting the gas's unique spectral signature rather than relying on temperature-based thermal radiation.
Solution Approach 2:
The patent introduces a tunable filter as an intermediary component that selects specific wavelengths from the laser beam. This filter acts as a mediator between the laser source and the gas target, ensuring that only wavelengths resonant with the gas's absorption lines reach the gas, thereby maximizing detection contrast.
3Ease of operation
If a handheld device is designed for gas leak detection, then device portability is improved, but power density must be reduced for safety and battery life
Solution Approach 1:
The patent implements periodic pulsing of the laser beam rather than continuous operation. The laser is activated only during the exposure period of the imaging sensor, creating a periodic on/off pattern that reduces average power consumption and density while maintaining sufficient peak power for detection during active measurement.
Solution Approach 2:
The patent uses a low-power laser diode that operates at reduced power density levels, applying partial action rather than full power. This approach provides sufficient detection capability for handheld applications while ensuring safety and extended battery life, accepting that the laser operates at sub-maximal power levels appropriate for portable devices.
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 effective detection of gas leaks in confined spaces with reduced power density and size, enhancing safety and battery life while maintaining detection sensitivity, suitable for use in vehicles and other small spaces.
Implementation Method 1
an unstabilized laser for providing a laser beam having at least one wavelength that is absorbable by a target gas
Implementation Method 2
a thermal imaging camera having a field of view and for imaging absorption of the at least one wavelength by the target gas
Implementation Method 3
a diverging lens for expanding the laser beam toward the field of view
Implementation Method 4
at least one wavelength that is absorbable by a target gas... imaging absorption of the at least one wavelength by the target gas
Data Source
AI summary
Techniques are disclosed relating to gas leak detection. The techniques can be deployed, for example, in compact, handheld portable devices usable for detecting leaks in space-confined applications. The devices generally include an unstablized laser and thermal imaging camera that allow for detection of gas that absorbs at least some of the wavelength of operation of the unstablized laser. The devices can be operated at a low-power density for safety and/or may be configured to mitigate wavelength hopping associated with unstablized laser light sources.