A device for eddy current testing dynamic parameters

 

(57) Abstract:

The invention relates to measuring technique and can be used to control the electro-physical parameters of objects of railway transport. The device comprises a matrix eddy current probe, made in the form of n oscillating circuits with "oven" chain and represents a single structure, impregnated with a compound, the detection unit, the signal processing unit Converter and recorder. Put the temperature sensor with n outputs, n filters designed to pass low-frequency information signal, and a sealing sheath of elastic dielectric material deposited on the surface of the structure of the Converter. The outputs of the temperature sensor is connected to middle points "oven" chains oscillatory circuits of the Converter, filters inputs connected to the outputs of the oscillator circuits of the Converter, and the outputs with the inputs of the detectors. The technical result - improving the efficiency of protection from external influences generated random dynamic processes. 1 Il.

The invention relates to control and measure the s, and electrophysical parameters of the objects of railway transport, for example, superstructure, contact network, undercarriage parts, rolling stock, etc. when the train moves in both normal and extreme operating conditions, characterized by large variations of the ambient temperature, mechanical stress, vibration, high electromagnetic fields.

The known device for eddy current testing dynamic parameters containing matrix eddy current probe, made in the form of n oscillating circuits, and connected in series block detectors with processing units and the Registrar [1, 2].

The practice of using these devices in extreme conditions of Transbaikal road revealed the following shortcomings is the deterioration of the metrological performance due to temperature changes in the environment, presence of precipitation in the form of rain and wet snow, snow drifts, mechanical influences on the design matrix Converter of various sediment (sand, oil and other) air flow when moving train, etc. that significantly hinders weatherproof research of parameters of interest and n is the moat, containing eddy-current transducer, made in the form of an oscillatory circuit with "oven" chain, and connected in series to the detector, the processing unit and the Registrar [3].

This device provides temperature stabilization of the output signal of the eddy current probe, but it may not provide full compensation temperature in a large range (from -60 to +50)oWith, as perfectly identical measuring and compensating channels of the Converter cannot be performed and, in addition, to ensure the operational reliability of the transducer exposed to precipitation, vibration, suspension air flow.

The essence of the proposed technical solution is that in a device for eddy current testing, containing matrix eddy current probe, made in the form of n oscillating circuits with "oven" chain and represents a single structure, impregnated with a compound, and consistently connected to the detection unit, the signal processing unit Converter and recorder, put the temperature sensor with n outputs, n filters and sealing sheath of elastic diouma chains oscillatory circuits of the matrix Converter, filters inputs connected to the outputs of the oscillator circuits of the Converter, and the outputs with the inputs of the detectors, the sealing membrane deposited on the surface of the structure of the matrix Converter.

Advantage technical solutions is a high performance capability in extreme environmental conditions due to the effective protection of the Converter from external influences generated random dynamic processes.

The drawing shows a block diagram of the device.

The device comprises a matrix eddy current transducer 1, sensor 2 temperature with n outputs, n barrier filter 3, the output is connected to a series-connected detection unit 4 unit 5 processing and Registrar 6.

Matrix eddy current transducer 1 is a single structure, impregnated with a compound, such as epoxy, polyurethane, and made in the form of n oscillating contours 7 "oven" chains 8, which are parallel capacitance of the oscillating circuit, where n is the number of oscillating circuits corresponding to the number of measured informative parameters of the control object. On neognosticism material, for example, rubber.

Each of the chains 8 consists of a series of varicap 10 and the tank 11. Sensor 2 temperature values of the output voltages in analog form calibrated in values, providing the capacitance change of varicap 10 "oven" chains 8, the equivalent of a full change of the temperature range (-60 to + 50)oSince, moreover, the zero value of the output voltage of the sensor 2 corresponds to the normal temperature +20oC. the Sensor 2 is placed in close proximity to the transducer 1.

The filters 3 are for bandwidth (the bandwidth from 1 Hz to 20 Hz) low-frequency information signal with the oscillating circuits 7 of the Converter 1 and filter interference caused by external electromagnetic fields, vibration and other mechanical effects.

Sealing the shell 9 is designed to protect the design of the Converter 1 from external mechanical effects of sediment air flow and meteorological factors, and also serves as a shock absorber Converter 1 from the base mounting (not shown).

The processing unit 5 is designed for sequential processing of the measured informative signal is ora 6 can be either visual, and a recording device.

The operation of the device.

High-frequency signal generator (not shown) excite oscillatory circuits 8 matrix Converter 1.

At normal temperature detuning circuits 7 is proportional to the change of the measured informative parameters of the test object, i.e. the magnitude of the output signals of the Converter 1 correspond to the values of the measured parameters, with values of capacity "oven" chains 8 permanent. These signals of the transducer are received at the inputs filter 3. In the absence of vibrations, i.e., static, output signals from the Converter 1 are passed through the filters 3 without filter and act on a block of 4 detectors and proyektirovaniye - to the input of the processing unit 5 and further to the Registrar 6. Still the normal ambient temperature is constant, and the vibration is absent, the signal Converter 1 are independent from the said interference amount.

When the temperature change occurs detuning circuits 7 of the Converter 1, and therefore, changing the values of the signals at the outputs of the circuits 7 and output voltages with n outputs of the sensor 2 temperature that causes a change in the value of capacity varik is run by the temperature change.

The feedback of the output voltage of the sensor 2 temperature varicap 10 chains 8 are restored to the original electrical paths 7 corresponding to at normal temperature, thereby ensuring the independence of the readings on the logger 6 from temperature changes.

When high-frequency vibrations (higher frequency 20 Hz) on the output signals of the circuits 7 of the Converter 1 are superimposed pomehoemissii frequency harmonics, which are filtered in filters 3, i.e. close to the ground. Low-frequency vibration (up to 1 Hz) is eliminated by damping design of the Converter 1 is sealed by the shell 9.

Protection of the construction of the transducer 1 from the meteorological factors and other mechanical impacts provides the shell 9.

Thus, the technical result of the invention is to improve the metrological characteristics (accuracy and sensitivity) and operational reliability of the device due to the automatic stabilization of the detuning circuits 7, regardless of changes in ambient temperature, vibrations, and other factors in railway transport.

The CLASS="ptx2">

3. A. C. the USSR 794470, CL G 01 N 27/90, BI 1, 1983.

A device for eddy current testing dynamic parameters of railway transport objects containing matrix eddy current probe, made in the form of n oscillating circuits with "oven" chain and represents a single structure, impregnated with a compound, and consistently connected to the detection unit, the signal processing unit Converter and recorder, characterized in that it introduced the temperature sensor with n outputs, n filters designed to pass low-frequency information signal, and a sealing sheath of elastic dielectric material, while the outputs of the temperature sensor is connected to middle points "oven" chains oscillatory circuits of the Converter, filters inputs connected to the outputs of the oscillator circuits of the Converter, and the outputs with the inputs of the detectors, the sealing membrane deposited on the surface of the structure of the Converter.

 

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