SU1260842A1 - Method of determining physical and mechanical properties of objects by means of buffer rod converter - Google Patents

Abstract

The invention relates to the field of determining the physicomechanical properties of objects by acoustic methods of non-destructive testing and can. be used to determine the moisture content of bulk materials. The aim of the invention is to determine the moisture content of bulk materials by registering an increase in the integral area of the acoustic contact of the working surface of the buffer rod with the soil by taking into account when determining the amplitudes of the reflected ultrasonic vibrations from the object under study, water and air. The transducer is introduced into the acoustic contact through the buffer rod with the object under study, radiates and receives ultrasonic vibrations reflected from the boundary of the buffer rod - the object under study, and their amplitude and / are measured. Then, the buffer rod is acoustically contacted with water and air, and the amplitudes and 2 and Uj, respectively, are measured. The moisture content of the bulk materials is determined by the ratio () using calibration curves. T il. S (l

Description

The invention relates to the determination of the physicomechanical properties of objects of acoustics using acoustic methods of non-destructive control and can be used to determine the moisture content of bulk materials, in particular, soil moisture in agronomy.

The aim of the invention is to determine the moisture content of bulk materials by registering an increase in the integral area of the acoustic contact of the working surface of the buffer rod with the soil by taking into account when determining the amplitudes of the reflected ultrasonic vibrations from the object under study, water and air.

The drawing shows a plot of the ratio of the moisture content of micellar carbonate

black soil.

The method for determining the physicomechanical properties of objects using a transducer with a buffer rod is as follows.

The transducer is introduced into the acoustic contact through a buffer rod with the object under study and emits ultrasonic (US) oscillations. Ultrasonic vibrations, the buffer rod reflected from the boundary — the object under study, are taken, and their amplitude and are measured. The transducer is then brought into acoustic contact through a buffer rod with water and emit ultrasonic vibrations. Ultrasonic vibrations reflected from the boundary of the buffer rod - water are taken, and their amplitudes are measured and 2- After that, the transducer is brought into acoustic contact through the buffer rod with air and radiate ultrasonic vibrations. The ultrasonic vibrations reflected from the buffer rod-air boundary are taken and measured

their amplitude is U ,. At the end of the measurement, the humidity is determined by the ratio of and, / (and -i).

The method of determining the physicomechanical properties of objects using a transducer with a buffer rod is implemented as follows.

The 1.8 MHz transducer from the flaw detector kit UDM-1M is brought into acoustic contact through a buffer rod, for example, from plexiglas with soil, and 55 ultrasonic oscillations are emitted. Increase the pressure of the transducer on the soil until the amplitude of the echo pulse reflected from the Plexiglas-soil interface stops changing, and the amplitude U is measured. Then, the remnants of the soil are removed from the working surface of the buffer rod and are completely immersed in water, while measuring the amplitude of the echo pulse reflected from the Plexiglas-Water interface, i.e. Uj. After removing residual moisture from the working surface of the buffer rod, the amplitude of the echo pulse reflected from the boundary is measured.

Plexiglas - air, i.e. U. From the measured amplitudes, the moisture index is calculated - the ratio U / (U-U), and the soil moisture is determined from calibration charts similar to that shown in the drawing.

thirty

35

The calibration chart shown in the drawing was obtained on samples taken from a layer of 20-60 cm of ordinary-25 micelle carbonate chernozem. Humidity was determined by a thermostat-weight method. It follows from the graph that the moisture index is most sensitive to changes in moisture in the interval of moisture content from 10 to 30%, which is most important to control from the point of view of agronomy.

Claims (1)

Invention Formula The method of determining the physicomechanical properties of objects using a transducer with a buffer rod, which consists in acoustically contacting the buffer rod with the object under study, radiating ultrasonic vibrations, accepting vibrations reflected from the boundary of the buffer rod - object under study, measuring the amplitude U oscillations and determine the required parameter by it, in order to moisture content of bulk materials, in addition, an acoustic contact of the buffer rod with water and air is carried out, and the amplitudes U and U are measured, correspondingly 2 3 BUT, and humidity is determined by the ratio u, / (Uj -Uj). ll ()  S 8W12nrf1820222 2f2S303l3t3f3i Editor L. Povhan Compiled by V. Gondarevsky Tehred L. Serdyukova Proofreader M. Sharoschi Order 5223/44 Circulation 778 Subscription VNIIPI USSR State Committee for inventions and discoveries. 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4