DE2021095C - Ultrasonic device for thickness measurements on thin-walled test objects - Google Patents

Description

3 ⁴ ·,

u., iK ».ili» of the Generatonmpubis

Zung arrangement, the first by an isolating capacitor negative Haid \ v * ■ _"Gene ratorimpuh

10 to the base of an input transistor 11 im through and cuts the posmv

Bmpfangteil 5 is connected. away. . _d period of the I i-

The output of the receiving part 5 is to a In the receiving part 5, the, ^eme _z j _{rzö erung in k,.}

Input of a trigger circuit 12 connected, 5 trasonic vibrations g eiLM ^ β ^.

its second input with the output of the loan on the ^Ech ° ^im P ^ulsan ' ^a l; _an input Π,

siungsträger2 is connected. The output of the trigger pulse getormi equals _:

rriggerschaUflig 12 is supplied to an integrating and triggering circuit 12 wr, B

Storage stage 13 in connection, which reaches a register exciting «^^^." "" ^ "N ß

striergpiit 14 is connected. “In sync with the * ™ ^ ™?% P £ ^ £ ^

The ultrasound device works as follows to the other input at the _right J · ..,.

; .ten: Square-wave pulses from the generator, the duration of which The trigger circuit U erze _g ^

equal to the half-cycle of ultrasonic vibrations voltage pulses whose uauei g

des Wandlerkopt'es in the transceiver head 3, the transit times of the E ^c hoimpulses m i-rumng unu.

long over the power amplifier 2 to the acoustic 15 delay time with the ron lu. G

, chen transceiver head in the transceiver head 3, pulses i »receiver wl S ^ thesej ^

the one ultrasonic pulse in the test object from the integrating and ^{storage unit} . "", 4 with one

, radiates. The voltage mu ^ "" t a,

;, surface reflected echo impu.s is emitted by the transmitter D - ^. ^ OT ^^ pcniSÄ through

angskopf3 received and in a short high-trek also cuo <g _t J- —- · ι · " _{it Da} fi ,,

converted into a luent electrical impulse, which is sent to the receiving party! 5 conditional ^Ve 7 ° ß ^er " ^ns _{d Re} " ~ _v

Entrance of the receiving part 5 is fed. becomes a linear division of the scale

The device 14 located at the entrance of the receiving part 5 is possible. Heprenzunesanordn.

Network allows the level of the first half- Simultaneously blocks the limitation «ujora _n _

.. "11- .ι— /^. ""k.".": 1 · _ · ι.ι._ jo ι ..: .. A _{a ""^ m} PrrriH> n? Enerator pelietenen liiipuis.

g, en level of the first half

wave of the generator pulse to choose so that at 95 the ge from the exciter generator. ¹¹ «« ⁵ ™ " V ■

free oscillations (Fig.2a) the trigger circuit limiting arrangement shoots aen ι

! 2 triggered and the amplitude of the limit limit level by one uroDe, u

first half-wave (Fig. 2b) becomes smaller and thus the transit time of the echo pulse is dependent on si.

prepare the trigger circuit 12 for the measuring operation. The size of this shift is " ¹ J *""" ¹ J ^

ict will. 30 near measuring zone and minimally in the distant M.

Since free oscillations one of the boundaries of the zone, whereby a uniform ^ ^v £ ^o rz delay.

Transducer in the transceiver head 3 gewanrieisiciwiru through the air shaping of the trigger pulse.

is formed, the acoustic resistance of which is much smaller.

is lower than that of the converting material, the ultra has via the separating capacitor lu an aie d «». ^. sound pulse compared to the generator pulse ent- · 35 transistor 11 in the receiving station S. macn "" »" - '

opposite polarity. The one from the diode 8 and the kung becomes the leading edge of this second half-wave.

Resistance9 existing limiting arrangement allows for the formation of the Ausloseimpuises rur uic niy, t.

the negative half-wave of the echo pulse and the circuit 12 are used.

1 sheet of drawings

Claims (1)

1 2 By the measures according to the invention Claim: achieves that the first half-wave of the generator pulses cut off and only the second half-turn Ultrasonic device for thickness measurements of the echo pulse is let through, so that d- on thin-walled test objects, in which one of the 5 "dead zone" is eliminated and the measurement of Series connection of a synchronizing device allows thicknesses that are smaller than aie white ,, - and a power amplifier of the existing length of the ultrasonic pulse sina. nerator supplies an electrical impulse, which is part of the- To solve the problem of the invention, st im ü ™, · r, by means of a transceiver head in an ultra-already an ultrasonic device for thickness control sound pulse converted and provided in the test object solutions on thin-walled products. is broadcast, with that of the opposite (cf. Offenlegungsscnntt ζυζυ 11 /). ...... lying test object surface reflected echo pulse from a generator with a ^ yncnronis; in the receiving part back into an electrical connection and with one connected to this in none pulse converted and a trigger circuit-based power amplifier supplied electrical » how it is fed to a recorder so that the pulse is fed to a transceiver head 1 characterized in that at the input an echo pulse reflected from the product to a of the receiving part (5) is provided a network receiving part, at the output of which c is, the one from a parallel to the Sendeemp trigger circuit and a registration device connected. Catch head (3) lying KC member (6,7) and sen, and which is characterized by dali one with the RC-GIied (6,7) connected in series 20 synchronization circuit as a blocking oscillator with ei «= tete, made of a diode (8) and a resistor transistor, in its collector circuit (9) the existing delimitation arrangement. Differentiator is that with the base of a 2> which via an isolating capacitor (10) to the th, the power amplifier forming transis Base of an input transistor (11) is connected in the Emp, in the collector circuit of the ¹ ^ catching part (5) is connected. 25 deempfangskopf is placed, and that to the Ausy ■ the trigger circuit an integrating and memory stage is connected, which consists of an integral, an emitter follower transistor and a potentiometer circuit to compensate for the Zeitverziv The invention relates to electronic monitoring in the receiving part, this Elemc. traschallgeräte, especially on ultrasonic devices, form a bridge circuit and form the basis lines for measuring the thickness of thin-walled emitter follower transistor at the output u _.; Test items. Trigger circuit and its emitter to the Integra.- Ultrasonic devices are already connected to the measuring member, which is also connected to the in (L solution of the thickness of thin-walled products- 35 bridge diagonals lying recording device verb. , knows (cf. for example the magazine »Defektoskopie«, which is. 1966, Moscow, No. 6, pp. 10 to 15), in which one is finally an ultrasound device der ei: der Series connection of a synchronizing device mentioned above became known (cf. and a power amplifier of the existing General Patent Specification 264 151), but which has a flip-tor supplies an electrical impulse, which by means of a 40 flop circuit with only one stable position (mono transceiver head in an ultrasound impulse um- flop), while the invention converted it more advantageously and is broadcast in the test specimen, either with the ftC element and the series with it from the opposite test object surface, via the separating capacitor to the base of the, reflected echo pulse in the receiving part connected again in the input transistor in the receiving part converted an electrical pulse and a 45 limiting arrangement of the diode and the Trigger circuit as well as a recording device pulling resistance gets by. That way, too will lead. the measuring accuracy and the operational safety of the A deficiency of the known devices consists of an increased ultrasonic device according to the invention, in that they have a "dead zone," which is characterized by the following the invention on the basis of the terminable Characteristics of the key pulse is conditionally 50 writing of an embodiment and the and prevents the measurement of thicknesses, the small drawing explains in more detail. It shows than the wavelength of the ultrasonic pulse. F i g. 1 is an electrical circuit diagram of the invention the known devices do not have a modern ultrasonic device and sufficient accuracy. F i g. 2 a, 2 b timing diagrams to explain the The invention is now based on the object 55 function of the device of FIG. an ultrasonic device for measuring the thickness. the ultrasonic device for measuring the thickness of thin-walled test objects, which is one of thin-walled test objects from a Measurement of with the wavelength of the ultrasonic generator, which a synchronizing device 1 and pulses of comparable thicknesses. a power amplifier 2 with a transistor According to the invention, this object is achieved by having a transmit / receive triggers that a network head 3 is switched on at the input of the receiving part, which is used via a network factory is provided, the one from a parallel to the suppression of the first half-wave of the generator Transceiver head lying /? C-element as well as a pulse at the same time only at the input of a connected in series with the ÄC member, connected from a catch part5. The network contains a Diode and a resistor 65 consisting of a capacitor6 and a resistor? contains arrangement, which via a separating existing /? C element that goes to the transceiver capacitor is connected in parallel to the base of an input transistor head 3, and one of a is connected in the receiver. Diode 8 and a resistor 9 existing limiting