Radiant energy – Invisible radiant energy responsive electric signalling – With means to inspect passive solid objects
Patent
1990-08-06
1991-12-31
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
With means to inspect passive solid objects
2503581, 250308, G01N 2306
Patent
active
050774786
ABSTRACT:
An improved basis weight measurement system which utilizes two means for irradiating a material to determine the distance from the radiating device to the material being surveilled and its mass per unit area. A portable, self-contained device applying this principle contains first and second radioactive emission means with corresponding detectors for each. A weaker emission is reflected back from the surface of the material to a detector, and a backscattered portion of a stronger emission is received by a detector after having penetrated the material. By virtue of there being two separately detectable emissions, the device can be used proximate the material being measured in order to perform the measurement without the need for direct contact between the device and the material. The measured basis weight is read directly from a digital Liquid Crystal Display, with the distance between the device and the surveilled material being indicated by Light Emitting Didoes. Another feature of the dual irradiation property of the device is that the speed of movement of the material does not deteriorate the accuracy of the measurement. Electronic memory and interface means are also provided for later transfer of data to a base computer and/or printer.
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Glick Edward J.
Hannaher Constantine
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