Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method and apparatus for remote measurement of vibration and properties of objects

a technology of electromagnetic wave and vibration, applied in the direction of material analysis, instruments, and solid analysis using sonic/ultrasonic/infrasonic waves, can solve the problems of high sensitivity of the transmitting/receiving assembly (tra), high cost of laser-doppler vibrometer, etc., to achieve enhanced performance and enhance performance. the effect of vibrometer

Inactive Publication Date: 2006-11-23
STEVENS INSTITUTE OF TECHNOLOGY
View PDF10 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011] It is even an additional object of the present invention to provide an additional set of acoustic transmitters / receivers attached directly to the electromagnetic wave transducer assembly to enhance performance.

Problems solved by technology

As a result, the laser-doppler vibrometers are quite expensive and delicate instruments are best suited for laboratory use.
Another serious drawback of the conventional remote sensing devices is their high sensitivity to unwanted vibration of the transmitting / receiving assembly (TRA).
Since the sensitivity of the conventional laser-doppler vibrometers is very high it is very difficult to isolate the TRA from such small vibrations especially under field conditions.
In addition to this, conventional vibrometers are susceptible to so-called cosine error.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and apparatus for remote measurement of vibration and properties of objects
  • Method and apparatus for remote measurement of vibration and properties of objects
  • Method and apparatus for remote measurement of vibration and properties of objects

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] The present invention relates to a method and apparatus which employs phase or amplitude modulated electromagnetic probing waves (in optical or microwave frequency ranges) emitted toward a vibrating object. This is shown schematically in FIG. 1. The apparatus is generally indicated at 10. A signal is generated by the signal generator 12, and then modulated by the modulating device 14 which receives a modulating signal from the modulating generator 16. Preferably, the signal is amplitude modulated. The optical or microwave probing signals 20 are transmitted by transmitter 18 and remotely irradiate an object 8 of interest. The object 8 reflects and / or scatters the probing wave 20 toward to a receiver 22, where it is received. Vibration of object 8 causes additional phase modulation to the probing wave 20, based on the fact that object 8 is vibrating, which becomes amplitude / phase modulated signal 24. At the receiving end, the signal 24 is demodulated by demodulation device 26, ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A method and apparatus is provided which employs phase or amplitude modulated electromagnetic probing waves (in optical or microwave frequency ranges or both) emitted toward a vibrating object. The optical and / or microwave probing signals remotely irradiate an object of interest. The object reflects and / or scatters the probing wave toward to a receiver. The reflected / scattered modulated signal is received with a remote sensor (receiver). Vibration causes additional phase modulation to the probing wave. At the receiving end, the signal is demodulated to extract and analyze the vibration waveform. The present invention can be utilized for nondestructive testing, monitoring of technological processes, structural integrity, noise and vibration control, mine detection, etc.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of Invention [0002] The present invention generally relates to a method and apparatus for nondestructive testing, monitoring of technological processes, determining structural integrity, noise and vibration control, and mine detection. More specifically, the present invention relates to a phase-amplitude modulated electromagnetic wave (PAM-EW) vibrometer. [0003] 2. Related Art [0004] Existing remote vibrometers are generally based on coherent laser generated signals. These devices, known as laser-doppler vibrometers, require precision and expensive optical elements (acousto-optic modulators, gas lasers, mirrors, beam splitters, etc.) A very precise, very coherent source is required, i.e. very stable phase characteristics. Fine adjustments are necessary to achieve a desirable effect. As a result, the laser-doppler vibrometers are quite expensive and delicate instruments are best suited for laboratory use. [0005] Another serious drawback of ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(United States)
IPC IPC(8): G01B9/02
CPCG01N29/2412G01N2291/044G01N2291/015G01N29/30
Inventor DONSKOY, DIMITRISEDUNOV, NIKOLAYWHITTAKER, EDWARD A.
Owner STEVENS INSTITUTE OF TECHNOLOGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com