US 4,255,709 AGranted

Device for providing an electrical signal proportional to the thickness of a measured coating with an automatic range switch and sensitivity control

OwnerNikolai N. Zatsepin, Siljuk, Viktor F. +5inventors

InventorsNikolai N. Zatsepin, Siljuk, Viktor F., Ivan I. Malko, Valentin A. Kaloshin, Valery M. Aniskovich, Nikolai N. Naumenko, Vladimir V. Perfiliev

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Abstract

A device for measuring the thickness of coatings, wherein a thickness gauge is electrically coupled to a circuit intended to convert the electric signal at the output of said thickness gauge into an electric signal proportional to the thickness of the coating. The conversion circuit comprises a peak detector whose output is electrically coupled to inputs of an automatic measurement range switching unit and a subtractor. Another input of the automatic measurement range switching unit is connected to an output of a reference voltage forming unit, its one output is electrically coupled to another input of the subtractor, another output is connected to an input of an adder, whereas a third output is electrically coupled to an input of a measuring sensitivity control unit. An output of the subtractor is connected to another input of the measuring sensitivity control unit whose output is connected to another input of the adder. The output of the adder serves as the output of the conversion circuit and is connected to recorder.

Claims4

Dependent claims

A device for measuring the thickness of coatings, comprising:

an electric signal generator having an output;
a thickness gauge having an input connected to said output of said electric signal generator, and an output;
a conversion circuit for converting an electric signal at said output of said thickness gauge to an electric signal of a magnitude proportional to the coating thickness being measured, having an input connected to said output of said thickness gauge, and an output;
a peak detector of said conversion circuit, having an input which serves as said input of said conversion circuit, and an output;
an automatic measurement range switching unit of said conversion circuit, having a first input electrically coupled to said output of said peak detector, a second input and a first, second, and third output;
a reference voltage forming unit of said conversion circuit, having an output connected to said second input of said automatic measurement range switching unit;
a subtractor of said conversion circuit, having a first input electrically coupled to said output of said peak detector, a second input electrically coupled to said first output of said automatic measurement range switching unit, and an output;
a measuring sensitivity control unit of said conversion circuit, having a first input connected to said output of said subtractor, a second input electrically coupled to said second output of said automatic measurement range switching unit, and an output;
an adder of said conversion circuit, having a first input connected to said output of said measuring sensitivity control unit and a second input connected to said third output of said automatic measurement range switching unit, and an output which serves as said output of said conversion circuit;
a recorder having an input connected to said output of said adder.

7 more elements

Dependencies are inferred from the claim text.