Multi-site Leak Detection via Centralized Laser Host
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Solution Overview
Problem
Existing leak detection methods, such as mass spectrometry and absorption spectroscopy, are complex and costly, making them impractical for use at multiple test sites, as they require significant technical investment and equipment duplication.
Innovation Solution
A device comprising multiple measuring cells connected via light-conducting optical fibers to a host unit with a frequency-variable laser and photodetector, allowing for centralized laser beam generation and modulation, and evaluation of signals from multiple sites, using techniques like two-tone modulation to minimize chromatic dispersion and absorption issues in optical fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mass spectrometers or absorption spectroscopy equipment are used for leak detection at multiple test sites, then detection capability is achieved, but device complexity and cost increase significantly due to requiring separate equipment at each site
Solution Approach 1:
The host unit serves as a universal device that can perform leak detection at multiple different test sites by connecting to various measuring cells. The single host unit with laser source and evaluation electronics provides the complete detection functionality, eliminating the need for separate complex equipment at each site while maintaining reliable leak detection capability across all locations.
Solution Approach 2:
Optical fibers serve as intermediaries to transmit laser light from the host unit to the measuring cells and carry the modulated signal back. This intermediary transmission system enables the host unit to remotely operate multiple measuring cells without requiring the host unit to be physically present at each test site, thus reducing on-site equipment complexity.
2Measurement precision
If absorption spectroscopy with laser modulation is used for tracer gas detection, then detection precision is improved, but device complexity and technical investment are multiplied when multiple test sites exist
Solution Approach 1:
The patent creates a simplified version of the spectroscopy system where only the optical transmission and basic modulation components are distributed to remote measuring cells, while the complex laser source and evaluation electronics remain centralized in the host unit. This copying approach maintains measurement precision through optical fiber transmission while avoiding the complexity of duplicating full spectroscopy equipment at each site.
3Adaptability or versatility
If optical fibers are used to transmit laser beams over long distances between host unit and measuring cells, then remote measurement capability is achieved, but signal quality degrades due to chromatic dispersion and absorption
Solution Approach 1:
The patent employs two-tone modulation with specific frequency spacing (intermediate frequency) that is optimized to be relatively small (preferably under 1 MHz). This parameter choice for the modulation frequencies ensures that the signal is not significantly affected by chromatic dispersion in the optical fibers, while still enabling effective leak detection. The wavelength is also selected (e.g., 1083 nm) to minimize absorption in the optical fiber.
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 efficient and cost-effective leak detection across multiple sites with reduced equipment requirements, as the host unit can manage all measurements, and the use of two-tone modulation maintains signal integrity over long distances.
Implementation Method 1
By excitation, tracer gas existing in the measuring cell can be brought to a higher energetic level which is referred to as a metastable state. Metastable gas atoms have a characteristic absorption spectrum and thus are optically detectable by spectroscopy.
Implementation Method 2
said at least one radiation receiver (16) is coupled to said host unit (25) via a light-conducting fiber (21). In the host unit, the laser beam will be modulated, and in the measuring cell, the modulation spectrum will be changed corresponding to the characteristic absorption line of the tracer gas. The resulting signal will be returned to the host unit via light-conducting fibers.
Data Source
Figure 1~2
Figure 3~6
AI summary
The leak detection device comprises a plurality of measuring cells (10) in whose interior the absorption of a laser beam (17) is influenced by the presence of tracer gas. All of said measuring cells (10) are connected to a host unit (25) via light-conducting fibers (28,34). In the host unit (25), a laser (26) designed for modulation and a photodetector (37) are arranged. Modulation of the laser radiation is preferably performed by two-tone frequency modulation. This has the effect that the fiber length cannot significantly skew the result of the measurement.