公开(公告)号：US3617735A

公开(公告)日：1971-11-02

申请号：US3617735D

申请日：1968-08-13

Applicant: INDUSTRIAL NUCLEONICS CORP

Inventor： SHOEMAKER DAVID J

IPC: G01F23/288 ,  G01N23/12

CPC classification number: G01F23/2885

Abstract: A level detector for fluent material in a receptacle or conduit includes a gamma ray source and detector means for deriving a signal indicative of the amount of radiation absorbed by the material. The output of the detector is fed to a pair of channels, each including a comparator network having a different reference input. The comparator channels together feed a logic network whereby a deadband is established between material levels related to the reference inputs to the comparators.

公开(公告)号：US3611408A

公开(公告)日：1971-10-05

申请号：US3611408D

申请日：1969-04-07

Applicant: INDUSTRIAL NUCLEONICS CORP

Inventor： SHOEMAKER DAVID J ,  DEWEY REX W ,  GRIFFITH JAMES L ,  TROUTMAN PAUL H ,  WOLF FRANKLIN A

IPC: G01R17/00 ,  G01D7/00

CPC classification number: G01R17/00

Abstract: Disclosed herein is a radiation gauge equipped with a strip chart recorder for measuring the properties of moving materials. The recorder has a multiplicity of scales with selectively illuminated scale numerals, a measuring pen and pointer, and a specification target marking pen and pointer. The gauge includes a digital setup arrangement which receives decimal input numbers, indicative of the specification target value for the material to be measured and its composition, either from decimally numbered dials on the operator''s control panel, or from some other input device. Digital logic circuits responsive to the input numbers automatically select the proper scale to be used and illuminate the proper scale numbers. The logic circuits use both the specification target numbers and the composition numbers to automatically and digitally select the center scale and span settings which properly calibrate the gauge for the material to be measured. The logic circuits further use these input numbers to control a digital to analog converter servomechanism which drives the specification target pen and pointer. The operation of this converter is automatically sequenced to mark successively on the moving recorder chart lines whose positions identify the scale used, the material composition measured and the specification target value. The final position of the target pen and pointer determines the set point for an automatic controller for the process machine which produces the measured material.

公开(公告)号：US3594575A

公开(公告)日：1971-07-20

申请号：US3594575D

申请日：1968-08-30

Applicant: INDUSTRIAL NUCLEONICS CORP

Inventor： SHOEMAKER DAVID J

IPC: G01F23/288 ,  G01N23/12

CPC classification number: G01F23/2885

Abstract: Specifically disclosed is a method and apparatus for linearizing the output of a nuclear radiation tank level gauge. A plurality of radiation detectors are vertically spaced along one side of the tank to produce separate signals which are fed to a summing amplifier and a point source is located on the opposite side of the tank. The summing amplifier has individually adjustable input resistors whereby each signal is individually weighted to produce an amplifier output signal which is linearized with respect to the liquid level in the tank. For standardization, when the liquid level is below the top detector, the signal from the top detector is separately fed to the amplifier input in substitution for the multiple input signals, and the gain of the measuring system is adjusted to compensate for changed parameters of the system.