CS241304B1 - Wiring a Circuit to Measure Reflection Speed - Google Patents

Abstract

The subject belongs to the field of electrical engineering and deals with the connection of a circuit for measuring the reflection velocity for devices for measuring the surface hardness of concrete bodies and structures. Its essence is that it consists of a measuring prism (MH), in which a groove is formed and two parallel holes perpendicular to the groove, in which a mechanical diaphragm (MC) moves. On one side of the measuring prism (MH) there are light sources and on the other side there are light-sensitive elements (FI, F2J, while the mechanical diaphragm (MC) transmits the light flux to these light-sensitive elements (Fl, F2j, which are further connected via the relevant evaluation circuits (VO1, VO2) to a flip-flop circuit (KO), which is connected to the evaluation apparatus (VA).

Description

241304 1

BACKGROUND OF THE INVENTION The present invention relates to the use of np: measurement of reflective velocity for measuring surface hardness of concrete and structure.

One of the problems decisive for premoment molding of a concrete element in the process technology is to measure the build-up of the strength of the fresh concrete - compacted concrete -, which is also required for the transport and assembly of building components. For these measurements, structural testing of building components is applied. The non-advantages of this and other destructive methods are that by performing the test, the component is aborted and the test is time-consecutive from the manufacturing cycle ramp and therefore does not have to be present, need not be representative of the hl 'sampling and not repeatable.

In addition to destructive methods, non-destructive methods also apply, and methods of measuring concrete strength, and non-electrical quantities characterizing concrete, for example, for demoulding in panels, are taken into account by taking traditional comparative test concrete strengths. To date, traditional non-destructive standard methods consist of testing concrete samples at the pressure to which the concrete cats are used, or samples in the form of cylinders that are bent tested and tensile. The main disadvantage of this method is the long test time. Non-destructive testing of concrete distinguishes approximate and refined tests, which should be taken into account when evaluating the results, while in approximate testing, we determine the value of the observed concrete property by evaluating the relevant uka-based according to the general calibration relationship and in a refined test, a well-established calibration relationship for a given concrete is used. In addition to these hardness methods, non-destructive and extensible methods, combined methods, chemical and electrical methods are used for further non-destructive methods. bodies and structures for the measurement of the reflecting speed and the device for its performance according to the author's certificate No. 237 807, the principle of which is that the registration of the rebound rate is recorded by means of two sets of fast-moving elements - light photoelectric sensors reacting to the screen. ík. The sensor pairs are located at a constant distance that delivers successive pulses, further electronically processed to the measurement signal. The magnitude of the electronically processed and evaluated signal strength determines the surface hardness or strength of the test object. However, this method does not solve the involvement of the circuit design for sensing and evaluating the reflection speed.

The aforementioned drawback is eliminated by the incorporation of the reflective velocity measuring circuit of the " surface " surface hardness of the concrete bodies and structures, consisting of a mechanical barrier coupled to the firing pin of the device, the nature of which is that the mechanical diaphragm is movably mounted in the groove of the measuring prism, in which two parallel openings are perpendicular to its groove, wherein a first light source and a second light source are disposed on one side of the apertures of the measuring plug. A second photocell element and a second photosensitive element are provided on the other side of the measuring prism openings, which are connected via evaluation circuits with a flip-flop which is coupled to the evaluation apparatus. attractiveness, so that measurements can be made in any position of the measuring device.

The accompanying drawing shows a circuit for measuring the reflection speed. In the measuring prism MH, the groove is formed and the two parallel holes drilled by the colm are provided with a groove in which the movable mechanical diaphragm MG is mechanically coupled to the hammer rocker of said device. On one side of the openings of the measuring prism MH there is a first light source Z1 and a second light source Z2. On the other hand, the first photosensitive element F1 and the second photosensitive element F2, which is further connected via a second evaluation circuit 2, connected to the KO flip-flop, are located on these openings. The first photosensitive element F1 is coupled to the flip-flop KO via the first evaluation circuit V1, which is coupled to the evaluation apparatus VA.

The luminous flux between the light sources Z1, Z2 and the photosensitive elements F1, F2 is closed or passed through a shielding mechanical diaphragm MG mounted on the hammer of the firing pin and moving in the grooving prism MH. For example, we connect an integrated contactless switch to the output of a photosensitive element such as a phototransistor. The output signal is sensed from the voltage divider, which is a phototransistor and a dummy potentiometer. The phototransistor changes the internal resistance with the illumination, behaves in the divider as a variable resistance in a wide range of values depending on the external illumination. The change in luminous flux intensity causes a change in the output voltage, which is manifested by a step increase or decrease in tension. The transfer of two sensors in the measuring edge-1e MH with a constant axis distance, by passing the mechanical shutterMG, two signals, differentially separated as * input and output. The time interval of input and output, pulse

Claims (1)

241304 zu, which is inversely proportional to the rebound speed - is inverse of each other. A similar product of the measured time interval at a constant distance of the sensor corresponding to the reflection speed is constant. OBJECTIVE The connection of the reflective speed measuring circuit for surface hardness measuring devices of concrete bodies and constructions consisting of a mechanical diaphragm mechanically coupled to the rocker arm of this device, characterized in that the mechanical diaphragm (MC) ) is movable in a groove of a measuring prism (MH), in which two parallel openings are perpendicular to its groove, wherein a first light source (Z1) and a second light source (Z2) are placed on one side of the measuring prism openings (MH); ) and on the other side of the aperture prism (MH) there is placed a photosensitive element (F1) and a second photosensitive element (F2), which are connected via evaluation circuits (VO1, VO2) with a flip-flop (KO) which it is associated with an evaluation apparatus (VA). 1 sheet of drawings