PATENT CLAIM ANALYSIS

Application Number: 15874672
Application Type: Utility
Filing Date: 2018-01
Publication Date: 2018-06
Patent Classification: ["356", "073100"]

Abstract:
A method of improving measurement speed of distributed optical fiber sensors by adopting orthogonal signals and the system thereof is disclosed, which is related to the optical fiber sensor field and solves the problems that conventional technology will increasing the bandwidth of the received signal, reducing the signal-to-noise ratio of the received signal or distortion the spatial resolution of the system. The method comprises steps of generating N periodic orthogonal optical pulse sequence; injecting the N periodic orthogonal optical pulse sequence into the optical fiber under test( 5 ); collecting the scattered light signal; demodulating the scattered light signal with the local oscillating light and then converting into digital signals; extracting the scatter information of the orthogonal optical pulses from the collected digital signals; and arranging the scattered information in order of precedence of the infusion. The measurement speed of the distributed optical fiber sensors is improved by N−1 times.

Claim (Index 7):
The method, as recited in  claim 5 , wherein the signal generating unit generates two channels of the orthogonal signals with a frequency of f 1  in the step 1.2, wherein the following steps are comprised of:\n generating two pulses with an initial phase of 0\u00b0 and a delay of nL/c as in-phase signals which are I-channels, wherein a math expression of the I-channels is written as:\n V Ii ( t )= V D  cos(2\u03c0 f 1 t )rect( t/T )+ V D  cos(2\u03c0 f 1 t )rect[( t\u2212nL/c )/ T] \n meanwhile, generating two pulses with initial phases of 90\u00b0 and \u221290\u00b0 respectively and a delay of nL/c as the orthogonal signals which are Q-channel signal, wherein a math expression of the Q-channel signal is as below:\n V Qi ( t )= V D  cos(2\u03c0 f 1 t+\u03c0/ 2)rect( t/T )+ V D  cos(2\u03c0 f 1 t\u2212\u03c0/ 2)rect[( t\u2212nL/c )/ T  \n wherein L denotes a length of the optical fiber under test( 5 ); c denotes a speed of light in vacuum; n denotes a refractive index of the optical fiber under test( 5 ); nL/c denotes a time interval between the up-conversion optical pulse signal and the down-conversion optical pulse signal; a periodic repetition of the up-conversion optical pulse signal and the down-conversion optical pulse optical pulse signal is 2 nL/c; f 1  denotes a frequency shift of the modulation unit; V D  denotes a radio-frequency signal amplitude of a modulation; rect denotes a rectangular function; T denotes a pulse width; t denotes a time variable; an output expression of the up-conversion optical pulse signal and the down-conversion optical pulse signal outputted by the modulation unit in the step 1.2 is as follow:\n E i =E c  cos [2\u03c0( f c +f 1 ) t ]rect( t/T )+ E c  cos [2\u03c0( f c \u2212f 1 ) t ]rect[( t\u2212nL/c )/ T] \n wherein, f c  denotes a frequency of an incident light; E c  denotes a signal amplitude of an optical signal after modulation; a modulated signal in the step 2.2 is as below:\n E 0 =AR ( z )exp{ j[ 2\u03c0 f 1 ( t\u2212T z )\u22122\u03c0 f c T z ]}\u00b7rect[( t\u2212T z )/ T]+AR ( z )exp{\u2212 j[ 2\u03c0 f 1 ( t\u2212T z )+2\u03c0 f c T z ]}\u00b7rect[( t\u2212nL/c\u2212T z )/ T] \n wherein, j denotes an imaginary unit; A denotes a response factor of a probe; T z  denotes a delay of receiving a scattered light signal on point z on the optical fiber under test ( 5 ) at a receiver; R(z) denotes a distribution of a scattered light signal amplitude along the optical fiber under test ( 5 ).

Metadata:
- Claim Count in Document: 3.0
- Percentile: 86.0
- Lexical Diversity: 1.91667
- Patent Class: 356.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['16066119', '15548519', '10332028', '11132937', '14118538']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.6972759283059465
- 35 USC 102 Novelty (BERT): 0.4748863301102159
- Combined Prediction Score: 0.6750369684863735
- Mean Citation Score: 190.64222
- Max Citation Score: 199.98369
- Similarity Product: 155.7091560462856

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 1
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test