Radiant energy – With charged particle beam deflection or focussing – With target means
Patent
1978-12-27
1981-02-10
Smith, Alfred E.
Radiant energy
With charged particle beam deflection or focussing
With target means
250322, H05B 100, G03B 4116
Patent
active
042501032
ABSTRACT:
In connection with radiographic inspection of structural and industrial materials, method and apparatus are disclosed for automatically determining and displaying the time required to expose a radiographic film, positioned to receive radiation passed by a test specimen, so that the finished film is exposed to an optimum blackening (density) for maximum film contrast. A plot is made of the variations in a total exposure parameter (representing the product of detected radiation rate and time needed to cause optimum film blackening) as a function of the voltage level applied to an X-ray tube. An electronic function generator storing the shape of this plot is incorporated into an exposure monitoring apparatus, such that for a selected tube voltage setting, the function generator produces an electrical analog signal of the corresponding exposure parameter. During the exposure, another signal is produced representing the rate of radiation as monitored by a diode detector positioned so as to receive the same radiation that is incident on the film. The signal representing the detected radiation rate is divided, by an electrical divider circuit into the signal representing total exposure, and the resulting quotient is an electrical signal representing the required exposure time.
REFERENCES:
patent: Re26497 (1968-12-01), Splain
patent: 3775669 (1973-11-01), Baker
patent: 3792267 (1974-02-01), Westerkowsky
patent: 3911273 (1975-10-01), Franke
patent: 3916192 (1975-10-01), Schmittmann et al.
patent: 4035649 (1977-07-01), Mester
patent: 4053774 (1977-10-01), Berdahl
patent: 4121104 (1978-10-01), Richter
patent: 4160906 (1979-07-01), Daniels
Vatne Rolf S.
Woodmansee Wayne E.
O'Hare Thomas P.
Smith Alfred E.
The Boeing Company
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