Optical fiber strain measurement apparatus and optical fiber strain measurement method
A technology of optical fiber strain and measuring device, which is applied in the direction of measuring device, adopting optical device, converting sensor output, etc., can solve the problems that cannot be directly applied to directly modulated semiconductor laser, and achieve the effect of high receiving sensitivity
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Example
[0038] (First embodiment)
[0039] Reference Figure 1~3 The first embodiment of the optical fiber strain measuring device of the present invention will be described. figure 1 It is a schematic block diagram of the first embodiment of the optical fiber strain measuring device. figure 2 It is a graph showing the spectral waveform. in figure 2 In (A) to (C), the horizontal axis represents wavelength, and the vertical axis represents signal intensity. figure 2 (A) represents the spectral waveform output from the direct modulation type light source described later, figure 2 (B) represents the spectral waveform output from the optical bandpass filter (BPF) on the transmitting side, figure 2 (C) represents the spectral waveform of backscattered light. image 3 It is a diagram showing the optical pulse waveform output from the optical band pass filter (BPF) on the transmitting side. in image 3 In the middle, the horizontal axis represents time, and the vertical axis represents si...
Example
[0066] (Second embodiment)
[0067] In BOTDR, when the amount of data increases due to lengthening or the like, the spatial resolution may be lowered to reduce the number of samples. In order to reduce the spatial resolution, it is necessary to increase the light pulse width.
[0068] Here, when the optical pulse width is changed, the duty ratio of the signal changes and the wavelength corresponding to the ON level changes. Figure 4 It is a graph showing the spectral waveform when the optical pulse width changes.
[0069] in Figure 4 Here, curve I represents the case where the optical pulse width is 31.25 ns, and curve II represents the case where the optical pulse width is 50 ns.
[0070] When the light pulse width is increased, the peak of the ON level approaches the peak of the OFF level (noise). That is, since the wavelength of the probe light changes, the wavelength band of Brillouin scattering also changes.
[0071] Therefore, in the optical fiber strain measuring device of th...
PUM
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap