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Ultrasonic measurement

An ultrasonic and workpiece technology, which is applied in the field of ultrasonic measurement devices, can solve the problems of difficulty in measuring the loss of multiple components at the same time, time lag, and different loss rates under test.

Active Publication Date: 2016-01-20
THE LUBRIZOL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method enables loss to be measured in near real time, with only a short lag caused by the time it takes for metal atoms to circulate
However, due to the use of radiation, this method can only be used in a controlled laboratory environment
Simultaneous measurement of depletion of multiple components is difficult due to limited availability of radioactive isotopes (some of which have limited half-lives)
Also, the measured attrition rate is often different from the actual attrition rate because not all expelled atoms are necessarily circulated

Method used

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Examples

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Embodiment Construction

[0045] first reference figure 1 , shows an apparatus for measuring the dimensions of a workpiece 12 using ultrasonic waves.

[0046] Ultrasound refers to the portion of the sound spectrum above human hearing, which is generally considered to include sounds with frequencies in excess of 20 kHz. Ultrasonic pulses pass through the solid at a velocity determined by the solid's material properties. Ultrasonic pulses are usually reflected from interfaces or boundaries when changes in acoustic properties occur.

[0047] Ultrasonic signals reflected from a boundary include information about said boundary. For example, by measuring the time it takes for an ultrasonic pulse sent into the workpiece to pass through the workpiece to reach the boundary and return as a reflection, information about the distance to the boundary can be determined. From said measurement time, it is possible (knowing the speed of sound in the material from which the workpiece is made) to calculate the distanc...

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Abstract

The method and apparatus involve ultrasonic measurement of dimensions such as the thickness (11) of a workpiece (12) that is lost over time by contact with the workpiece (14). An ultrasonic transceiver (18) couples ultrasonic waves into the workpiece (12). The outgoing ultrasound i results in an echo r returning to the transceiver (18). This allows the time of flight to be calculated to yield a value for thickness (11). In the described example, the measurements are repeated multiple times within a specified period to extract information from each received signal. Information extracted from the plurality of received signals is used to generate a single value characterizing the dimensions of the workpiece (12) over a specified period.

Description

technical field [0001] The present invention relates to ultrasonic measurement and in particular, but not exclusively, to an apparatus and method for ultrasonic measurement of dimensions. Background technique [0002] In many cases, for example to increase efficiency, it is beneficial to determine the impact of wear on a workpiece or to discover the point at which significant wear is imminent. For example, a workpiece that is in daily contact with another workpiece in use may change in size over time as it is worn away by the contact. Loss can also occur without contact, for example through corrosion. Determining the effect of wear on a workpiece can be important in calculating the expected life of the workpiece, which determination enables the workpiece to be replaced before it fails or causes damage. Understanding wear effects is particularly important in machine components such as vehicle engine components or bearings. Determining the effects of wear can also be benefi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S15/89
CPCA61B8/58B06B1/0207G01S15/89G01N29/07G01N29/346
Inventor O·史密斯M·R·萨顿M·佩普洛
Owner THE LUBRIZOL CORP
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