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Center Independent Research & Development: GSFC IRAD

Design of Laser-Based Remote Sensing Instrument for Measuring Ocean Temperature and Salinity Depth Profiles

Active Technology Project

Project Introduction

We propose to design an instrument with the capability to measure both temperature and salinity profiles of ocean mixed layers.  We will design the key elements of the instrument including receiver design, measurement and detection schemes, laser transmitter characteristics, and overall link margin.  Our plan is to create an instrument design that can potentially measure seawater salinity and vertical temperature profiles utilizing Brillouin and Raman scattering. 

The objectives of the proposed instrument design effort are as follows:

(a)  Evaluating various Raman and Brillouin scattering techniques and determining how much information can likely be derived from them, and how well they could be incorporated into an aircraft instrument.

(b)  Determining link margins for potential Raman and Brillouin detection schemes, and defining crucial laser parameters including pulse width, repetition rate, pulse energy, and laser wavelength. 

(c)  Designing a receiver system that can utilize the preferred scattering detection scheme(s).  Also included in receiver design are calculations of required telescope FOV, optical throughput, coupling, and detector efficiency.

(d)  Design of laser transmitter & hardware to meet instrument detection scheme requirements.

The science product of the proposed instrument is vertical profiles of water column temperature and salinity with 1 m resolution obtained from collected Brillouin and Raman scattering spectra.  This is an early-stage innovation that would seek further funding for hardware development at the conclusion of this design effort. 



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