Evaluating the measurement error of thermophysical properties of liquids at high pressures by the periodic-heating compensation method

1992 ◽  
Vol 35 (6) ◽  
pp. 703-704
Author(s):  
A. D. Abdullaev
Keyword(s):  
Measurement Error ◽  
Thermophysical Properties ◽  
High Pressures ◽  
Compensation Method ◽  
Periodic Heating

scholarly journals Thermophysical Properties of 1-Butanol at High Pressures

Energies ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 5046
Author(s):  
Marzena Dzida
Keyword(s):  
Speed Of Sound ◽  
Thermophysical Properties ◽  
High Pressures ◽  
Fuel Additive ◽  
Temperature Range ◽  
Isobaric Thermal Expansion ◽  
Isentropic And Isothermal Compressibilities ◽  
Overlap Method ◽  
Pulse Echo ◽  
Better Than

1-Butanol can be considered as a good fuel additive, which can be used at high pressures. Therefore, the knowledge of high-pressure thermophysical properties is crucial for this application. In this paper, new experimental data on the speed of sound in 1-butanol in the temperature range from 293 to 318 K and at pressures up to 101 MPa are reported. The speed of sound at a frequency of 2 MHz was measured at atmospheric and high pressures using two measuring sets operating on the principle of the pulse–echo–overlap method. The measurement uncertainties were estimated to be better than ±0.5 m·s−1 and ± 1 m·s−1 at atmospheric and high pressures, respectively. Additionally, the density was measured under atmospheric pressure in the temperature range from 293 to 318 K using a vibrating tube densimeter Anton Paar DMA 5000. Using the experimental results, the density and isobaric and isochoric heat capacities, isentropic and isothermal compressibilities, isobaric thermal expansion, and internal pressure were calculated at temperatures from 293 to 318 K and at pressures up to 100 MPa.

A Dynamic Voltage Compensation Method for Improving Weighing Accuracy

2013 ◽  
Vol 333-335 ◽  
pp. 317-321
Author(s):  
Rong Sen Yin ◽  
Jia Qiang Yang
Keyword(s):  
Measurement Error ◽  
Digital Signal Processor ◽  
Digital Signal ◽  
Wheatstone Bridge ◽  
External Source ◽  
Compensation Method ◽  
Voltage Fluctuation ◽  
Voltage Compensation ◽  
Voltage Signal ◽  
Dynamic Voltage

In order to eliminate the measurement error caused by working voltage fluctuation of weighing sensor, a dynamic voltage compensation method for improving the weighing accuracy was proposed in the paper. The method takes strain gauge type pressure sensor as the weighing sensor and corrects Wheatstone bridge circuit. By synchronously detecting output voltage signal and working voltage of the weighing sensor, the method dynamically compensates the working voltage fluctuation of the weighing sensor, corrects the measurement error caused by the voltage fluctuation of external source and calculates the weight in real time. A weighing system based on the digital signal processor (DSP) was designed. Results of simulation experiment verify the feasibility of the proposed method.

The Design about Aiming at Amount of Change from Baseline Detector with Characteristics of High-Resolution

2012 ◽  
Vol 249-250 ◽  
pp. 218-225
Author(s):  
Jin Song Wang ◽  
Yu Chen Zhao ◽  
Zhi Yong An
Keyword(s):  
Measurement Error ◽  
High Resolution ◽  
Flat Glass ◽  
Angle Measurement ◽  
Compensation Method ◽  
Experimental Results

In order to measure to the aiming at amount of changes from baseline, we designed a detector with characteristics of high-resolution. The apparatus takes with the combination of flat glass-based compensation method and reading such sine mechanism on the zero subdivision institutions, to achieve the angle measurement in way of high-resolution and outside reading. By using 0.2″theodolite as the basic instrument for verification of measurement, experimental results show that resolution of the instrument to achieve 2.16″, the measurement error less than 10.8″.

Experimental Investigation and Modeling of Thermophysical Properties of Pure Methyl and Ethyl Esters at High Pressures

2017 ◽  
Vol 31 (7) ◽  
pp. 7110-7122 ◽  
Author(s):  
Mohamed A. Aissa ◽  
Gorica R. Ivaniš ◽  
Ivona R. Radović ◽  
Mirjana Lj. Kijevčanin
Keyword(s):  
Experimental Investigation ◽  
Thermophysical Properties ◽  
High Pressures ◽  
Ethyl Esters
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