Method of measuring profiles of temperature, pressure and density in liquid by distributed profilemeters

 V.A. Gaisky,  P.V. Gaisky

Institute of  Natural and Technical Systems, Russian Federation, Sevastopol, Lenin St., 28

E-mail: gaysky@inbox.ru

DOI: 10.33075/2220-5861-2018-3-13-18

UDC 536.5.08

Abstract:

The method is intended for use in oceanology and can be used in other areas. The essence of the method is in using distributed profilemeters, containing n conductors modulated by linear sensitivity to the functions   using three profilemeters with different temperature i) and tenso i) sensitivity , placing them in a common soft shell and installed in medium along measured profile, measuring  conductors resistance   and determine the profile of temperature θ(z), pressure P(z) and density ρ(z) by formulas:

where  z – spatial coordinate on profile (in particular, depth); aj , bj – expansion coefficients θ(z) and P(z) on basis of orthogonal functions , and coefficients aj and bj are determined by solving of  n  equations systems in the form:

where  для  для  – integral measured resistance of 0-conductor (unmodulated) of i-profilemeter; Rij – integral measured resistance of j-conductor, modulated by function φj(z) with amplitude rim at background  of   constant component rim; Rim – equivalent  resistance  of i-profilemeter conductor with constant linear resistance rim with initial conditions; dP(z)/dz – derivative of pressure profile at point z; g(φ,z) – gravitational acceleration depending on geographical latitude of place φ and point depth z on profile. Technical result is in simultaneous measurement of temperature, pressure and density profiles with increased accuracy.

Keywords: distributed thermoprofilemeters, pressure thermoprofilemeter, density profile.

Full text in PDF (RUS)

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