公开(公告)号：US3729632A

公开(公告)日：1973-04-24

申请号：US3729632D

申请日：1970-12-21

Applicant: INDUSTRIAL NUCLEONICS CORP

Inventor： CHO B ,  PFEIFER R ,  UTT O

IPC: G01B15/02 ,  G01N23/02

CPC classification number: G01B15/025

Abstract: A PENETRATING RADIATION GAUGE INCLUDES A PULSED X-RAY SOURCE FOR DETERMINING WALL THICKNESS OF ARTICLES MOVING PAST THE SOURCE. THE GUAGE IS CONTINUOUSLY STANDERDIZED BY RESPECTIVELY PLACING IN THE SOURCE RADIATION FIELD FIRST AND SECOND DIFFERENT STANDARD SAMPLES BETWEEN FIRST AND SECOND DIFFERENT PAIRS OF ADJACENT ARTICLES. A DETECTOR RESPONDS TO THE LEVEL OF RADIATION ABSORBED BY ARTICLES WHILE THICKNESS IN BEING MEASURED AND BY THE SAMPLES WHILE STANDARDIZATION IS BEING PERFORMED TO DERIVE AN OUTPUT SIGNAL EXPONENTIALLY RELATED TO THE RADIATION ABSOBPTION PROPERTIES OF THE ARTICLES AND SAMPLES. A LINEARIZING NETWORK RESPONSIVE TO THE DIRECTOR CONVERTS THE EXPONENTIAL RELATIONSHIP INTO A STRAIGHT LINE FUNCTION WHEREBY A LINEAR RELATIONSHIP BETWEEN THE MAGNITUDE OF THE DETECTOR OUTPUT SIGNAL AND THE ABSORPTION PROPERTY IS DERIVED. WHILE THE LINEARIZING NETWORK IS DERIVING A SIGNAL INDICATIVE OF THE RADIATION ABSORPTION PROPERTIES OF THE FIRST SAMPLE, THE STRAIGHT LINE RELATIONSHIP IS ADJUSTED SO THAT THE GAUGE RESPONSE IS A POINT ON THE LINE HAVING A PREDETERMINED OUTPUT SIGNAL CORRESPONDING WITH THE ABSORPTION PROPERTIES OF THE FIRST SAMPLES. WHILE THE LINEARIZING NETWORK IS DERIVING A SIGNAL INDICATIVE OF THE OBSORPTION PROPERTIES OF THE SECOND SAMPLES, THE SLOPE OF THE LINE ADJUSTED SO THAT THE GUAGE DERIVES AN OUTPUT SIGNAL HAVING A PREDETERMINED MAGNITUDE CORRESPONDING WITH THE OBSORPTION PROPERTIES OF THE SECOND SAMPLES

D R A W I N G

公开(公告)号：US3848125A

公开(公告)日：1974-11-12

申请号：US18183671

申请日：1971-09-20

Applicant: INDUSTRIAL NUCLEONICS CORP

Inventor： UTT O ,  EVANS H

IPC: G01B15/02 ,  G01N23/223 ,  G01N23/22

CPC classification number: G01N23/223 ,  G01B15/02 ,  G01N2223/076

Abstract: Disclosed is a system for measuring the thickness of a zinc coating on an iron sheet wherein the coating and substrate are irradiated by a continuous X-ray beam source. The beam is propagated in a first or positive direction away from the source through a reference chamber to the coating and substrate. In response to fluorescence of the coating and substrate due to Xray irradiation, secondary X-rays are derived and propagate in a second or negative direction generally towards the source. The intensity of the negatively directed X-rays is determined with a measuring chamber concentric with the reference chamber. The reference and measuring chambers include a noble gas that is ionized in response to the X-rays impinging thereon. Gases flow between the two chambers by a structure which prevents coupling of ions between the chambers, whereby the relative sensitivity of the two chambers is equalized. Responses from the two chambers are combined to provide a signal that is independent of intensity variations of the X-ray beam source. The combined signal is electronically processed to provide an output signal directly proportional to the zinc coating. Standardization of the gauge is performed by substituting first and second samples, respectively having no and a predetermined amount of zinc on an iron substrate, for the sheet being measured for coating thickness.

Abstract translation: 公开了一种用于测量铁片上锌涂层的厚度的系统，其中涂层和基底被连续的X射线束源照射。 光束以第一或正方向通过参考室远离光源传播到涂层和基底。 响应于由于X射线照射引起的涂层和基底的荧光，二次X射线被导出并且通常朝向源的第二或负方向传播。 通过与参考室同心的测量室确定负向X射线的强度。 参考和测量室包括响应于其上照射的X射线而电离的惰性气体。 气体通过防止室之间的离子耦合的结构在两个室之间流动，由此两个室的相对灵敏度相等。 来自两个室的响应被组合以提供独立于X射线束源的强度变化的信号。 组合信号被电子处理以提供与锌涂层成正比的输出信号。 通过将第一和第二样品分别替换为在铁基材上没有和预定量的锌以测量涂层厚度来进行标准化。