Invention Grant
- Patent Title: High speed frequency hopping DAS interrogation using AOM-gated re-circulating loop and frequency-shifted receiver LO
-
Application No.: US16258586Application Date: 2019-01-26
-
Publication No.: US11159200B2Publication Date: 2021-10-26
- Inventor: Yue-Kai Huang , Ezra Ip , Giovanni Milione , Fatih Yaman
- Applicant: NEC Laboratories America, Inc.
- Applicant Address: US NJ Princeton
- Assignee: NEC Laboratories America, Inc.
- Current Assignee: NEC Laboratories America, Inc.
- Current Assignee Address: US NJ Princeton
- Agent Joseph Kolodka
- Main IPC: H04B1/00
- IPC: H04B1/00 ; H04B1/7136 ; G01H9/00 ; H04B1/715 ; H04B1/7143 ; H04B14/00 ; H04B1/713

Abstract:
Aspects of the present disclosure describe systems, methods, and structures for high speed frequency hopping distributed acoustic sensing using an acousto-optic modulated (AOM), gated re-circulating loop and a frequency shifted receiver local oscillator. Using the re-circulating loop controlled by the AOM to generate frequency-hopping pulse(s) increases DAS acoustic bandwidth overcomes infirmities exhibited in the art that generate multiple frequency patterns that are not suitable for long-distance DAS. Additionally, by employing frequency shifted local oscillator (LO) with asymmetric in band detection, bandwidth requirements are reduced by one half.
Public/Granted literature
Information query