Title:
METHOD AND DEVICE FOR ONLINE MEASUREMENT OF SEAWATER SALINITY
Document Type and Number:
WIPO Patent Application WO/2017/206956
Kind Code:
A1
Abstract:
A method and device for online measurement of seawater salinity. The method comprises: controlling a sweep laser source by using a sweep synchronization signal such that the wavelength of frequency modulated light waves outputted by the sweep laser source is a periodic sawtooth signal; splitting the outputted frequency modulated light waves into two paths which are respectively sent to a refractive index probe and a temperature probe in seawater, the refractive index probe being an interferometer structure which returns an interference light intensity signal having a frequency value associated with a seawater refractive index and computes the refractive index of seawater by performing discrete Fourier transform on the interference light intensity, the temperature probe being provided therein with a fiber Bragg grating which forms a reflection spectrum having a Bragg wavelength associated with seawater temperature; performing synchronous discrete sampling on the sweep synchronization signal and the light intensity signal reflected by the fiber Bragg grating, and computing a seawater temperature value according to a grating temperature sensing/demodulation algorithm; and obtaining the salinity value of the measured seawater according to the obtained refractive index, the temperature value, and the average wavelength of the frequency-modulated light waves by solving an empirical equation, thereby implementing online measurement of seawater salinity.
Inventors:
ZOU BO (CN)
Application Number:
PCT/CN2017/087086
Publication Date:
December 07, 2017
Filing Date:
June 02, 2017
Export Citation:
Assignee:
SHENZHEN POLYTECHNIC (CN)
International Classes:
G01N21/45; G01K11/3206
Foreign References:
| CN105891434A | 2016-08-24 | |||
| CN1374529A | 2002-10-16 | |||
| CN103743675A | 2014-04-23 | |||
| CN202453113U | 2012-09-26 | |||
| CN104166130A | 2014-11-26 | |||
| CN101271241A | 2008-09-24 | |||
| US20140293286A1 | 2014-10-02 | |||
| JP2008203129A | 2008-09-04 |
Other References:
YU , YIN ET AL.: "Simulation of Simultaneously Obtaining Ocean Temperature and Salinity Using Dual-Wavelength Brillouin Lidar", LASER PHYS. LETT., vol. 11, no. 3, 23 January 2014 (2014-01-23), pages 1 - 6, XP055444321, ISSN: 1612-202X
Attorney, Agent or Firm:
SZ KINDWALF INTELLECTUAL PROPERTY FIRM (CN)
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