Method and apparatus for volume measurement
First Claim
1. A method of measuring the volume (v) of a gas in a container, comprising varying the container volume according to a sine wave between a minimum and a maximum value, said variation being effected at a constant frequency but at a varying amplitude, in order to obtain a predetermined pressure difference (Δ
- p) of the gas in the container;
determining the volume difference (Δ
V) corresponding to said predetermined pressure difference (Δ
p) by detecting the points of time when at least two points on said sine wave are attained which correspond to two predetermined values of the container volume;
measuring the time between the said two points on said sine wave and using said measurement for calculating the maximum and the minimum value of the volume (V), which are used for calculating the volume difference (Δ
V) corresponding to said predetermined pressure difference (Δ
p); and
calculating the volume (V) on the basis of the formula V=Δ
Vxp0 xη
/Δ
p wherein p0 =the static pressure and η
=Cp/Cv, wherein Cp and Cv are the specific heat capacity at, respectively, constant pressure and constant volume of the gas within the container.
1 Assignment
0 Petitions
Accused Products
Abstract
A method of measuring the volume (V) of a gas in a container (20) comprises varying the container volume according to a sine wave between a minimum and a maximum value, the variation being made at a constant frequency but at varying amplitude, to obtain a predetermined pressure difference (Δp), and the volume difference (ΔV) corresponding to said predetermined pressure difference (Δp) being determined by detecting the points of time when at least two points on the sine wave are attained which correspond to two predetermined values of the container volume. By measuring the time between the two points on the sine wave, the sine wave peak values for the volume difference (ΔV) corresponding to said predetermined pressure difference (Δp) may be calculated and, thus, the said volume difference (ΔV). By means of the formula V=ΔVxp0 xη/Δp, wherein p0 =the static pressure and η=Cp/Cv wherein Cp an Cv are the specific heat capacity at, respectively, constant pressure and constant volume for the gas within the container, the gas volume (V) in the container may then be determined.
An apparatus for carrying the method into effect has also been constructed.
28 Citations
2 Claims
-
1. A method of measuring the volume (v) of a gas in a container, comprising varying the container volume according to a sine wave between a minimum and a maximum value, said variation being effected at a constant frequency but at a varying amplitude, in order to obtain a predetermined pressure difference (Δ
- p) of the gas in the container;
determining the volume difference (Δ
V) corresponding to said predetermined pressure difference (Δ
p) by detecting the points of time when at least two points on said sine wave are attained which correspond to two predetermined values of the container volume;
measuring the time between the said two points on said sine wave and using said measurement for calculating the maximum and the minimum value of the volume (V), which are used for calculating the volume difference (Δ
V) corresponding to said predetermined pressure difference (Δ
p); and
calculating the volume (V) on the basis of the formula V=Δ
Vxp0 xη
/Δ
p wherein p0 =the static pressure and η
=Cp/Cv, wherein Cp and Cv are the specific heat capacity at, respectively, constant pressure and constant volume of the gas within the container. - View Dependent Claims (2)
- p) of the gas in the container;
Specification
-
- Resources
-
Current AssigneeEnpece AB OLE Romers VAG
-
Original AssigneeEnpece AB
-
InventorsHesthamar, Tore, Thyren, Carl H.
-
Primary Examiner(s)Levy, Stewart J.
-
Assistant Examiner(s)Raevis, Robert R.
-
Application NumberUS06/916,545Time in Patent Office432 DaysField of Search73/149, 73/290 BUS Class Current73/149CPC Class CodesG01F 17/00 Methods or apparatus for de...
