SU1497447A1 - Apparatus for measuring the thickness of protective concrete layer - Google Patents

Abstract

The invention relates to the non-destructive quality control of reinforced concrete structures and can be used in automated stands at building factories. The aim of the invention is to improve the accuracy and performance of measurements by automating measurements and sequential hardware search for extreme values. When the inductive transducer 2 is scanning the surface of the product under test, the signal at the output of the generator unit 1 varies depending on the inductive resistance introduced by the reinforcing bars. The decoder 11 gates turning on the peak detector 13 and stores the measured values alternately in memory registers 15 and 16. These values are compared by comparison element 17 and when they coincide, i.e. reaching an extreme value, is fixed by indicator 8, calibrated in units of the thickness of the protective layer of concrete. 1 il.

Description

41 Kl

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The invention relates to non-destructive testing of reinforced concrete structures and can be used in automated stands at construction plants.

The aim of the invention is to improve the accuracy and performance of measurements by automating measurements and sequential hardware search for extreme values.

The drawing shows a block diagram of a device for measuring the thickness of a protective layer of concrete.

The device contains a generator unit 1 with an inductive converter 4, a voltage source 3 connected in series, a output voltage combined with the output of the generator unit 1, a conversion circuit 4, a threshold element 5, an AND element 6, a decoder 7 and an indicator 8. I Also device contains sequentially connected pulse generator 9, pulse counter 10, decoder 11, element 12 OR, peak detector 13, the second input of which is connected to the output of conversion circuit 4, analog-to-digital converter 14, the second input of which It is connected to element 12 OR, two registers 15, 16 of memory, the control inputs of which are connected to the first and second outputs of the decoder 11, respectively, and the outputs of register 16 of memory are connected to the inputs of the decipheror 7, and element 17 comparison, control input. which is connected to the third output of the decoder 11, and the output is connected to the second input of the element 6 I.

The device works as follows.

When the inductive converter 2 is moved along the surface of the reinforced concrete structure (not shown), the output voltage of the generator unit 1, which is linearized by the conversion circuit 4 due to the use of the source 3 of the reference voltage, changes due to the change in the inductive resistance.

The signal from the output of the conversion circuit 4 is fed through a peak detector 13 and an analog-digital converter to the inputs of memory registers 15 and 16. Simultaneous Shaper

9 impulses form rectangular impulses allowing counter counting

10 pulses.

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The decoupler 1 1, deciphering the state of the pulse counter through the element 12 OR, allows the peak detector 13 and the analog-digital converter 14 to operate. At the same time, the decoder 11 sequentially gates the memory registers 15 and 16 by writing counts to them sequentially. Comparison element 17 compares the recorded codes, and if they coincide, the signal of reaching the extreme value of the .6 I element. At the same time, through the threshold element 5, the trigger level of which is equal to the upper limit of the measurement range of the thickness of the concrete concrete layer element 6 I.

The enable signal from the output elec. Step 6 And goes to the decoder 7, which converts the digital value of the thickness of the protective layer of concrete, recorded in memory register 16, into a code that is displayed on the indicator 8.

Claims (1)

Formula of the invention; nor A device for measuring the thickness of the protective layer of concrete, containing a generator unit with an inductive transducer, connected in series with a source of reference voltage, the output of which is combined with the code of the generator unit, and a conversion circuit, an indicator that , in order to improve the accuracy and performance of measurements, it is equipped with series-connected pulse generator connected to the output of the generator-unit, a pulse counter, the first decoder, the OR element, peak, a vector whose second input is connected to the output of the conversion circuit is an analog-to-digital converter, the control input of which is connected to the output of the OR element by two memory registers, the control inputs of which are connected to the first and second outputs of the first decoder, respectively, the comparison element, the control input which is connected to the third output of the first decipher, element I, the second decoder, the second input of which is connected to the output of the second memory register, and the output is connected to 51497447.6 the input of the indicator, and the threshold conversion elements and the second input cop included between the output circuit of the element I.