| 摘要 |
1,222,586. Photo-electric measurement of volume. NORTH AMERICAN ROCKWELL CORP. April 25, 1968 [April 26, 1967], No.19702/68. Heading G1A. The volume (or mass) of liquid 18 in a container 20 is measured by photo-electric apparatus comprising radioactive sources 12, 14 and a detector 10 of secondary radiation caused by scattering in the liquid of the radiation from the sources. Primary radiation received by the detector would lower sensitivity so that lead shields 22, 24 block direct radiation from reaching the detector. The source material may be a γ-emitting isotope e.g. Kr85 or (for cryogenic fluids) Cs137. The detector is a Geiger counter connected through a pulse shaper 52, producing pulses of uniform height and width, to an integrating amplifier 54 and an indicator 56. The measured value is rendered linearly proportional to the volume by the configuration of sources and detector (d 1 >d 2 ) in the container 20. When using a spherical container, Fig.3 (not shown), the source is bent appropriately at points along its length. Sources may be spaced around the detector in cruciform, triangular or circular configuration. The indicator is zeroed when the container is empty, since a small count is obtained from the inside walls of the container. |
