Title of Invention	A DEVICE FOR MEASURING THE VIBRATION AMPLITUDE AND FREQUENCY OF A VIBRATING BODY WITHOUT PHYSICAL CONTACT THEREWITH
Abstract	A device for measuring the vibration amplitude and frequency of a vibrating body without physical contact therewith comprising an ultrasonic transmitter for transmitting ultrasonic waves such that the said transmitter consisting of a signal generator, power amplifier and an ultrasonic transmitting transducer; an ultrasonic receiver for picking up the vibrations of the said surface, said receiver consisting of an ultrasonic receiving transducer, a signal conditioner, a digitizer, and a digital signal processing unit for furnishing an output signal of the amplitude and frequency of vibration of the vibrating body.

Title of Invention

A DEVICE FOR MEASURING THE VIBRATION AMPLITUDE AND FREQUENCY OF A VIBRATING BODY WITHOUT PHYSICAL CONTACT THEREWITH

Abstract

A device for measuring the vibration amplitude and frequency of a vibrating body without physical contact therewith comprising an ultrasonic transmitter for transmitting ultrasonic waves such that the said transmitter consisting of a signal generator, power amplifier and an ultrasonic transmitting transducer; an ultrasonic receiver for picking up the vibrations of the said surface, said receiver consisting of an ultrasonic receiving transducer, a signal conditioner, a digitizer, and a digital signal processing unit for furnishing an output signal of the amplitude and frequency of vibration of the vibrating body.

Full Text	.'This invention relates to a device for measuring the vibration amplitude and frequency of a vibrating body without physical contact therewith. Conventionally, accelerometers and geophones (for ground vibrations) are employed for the measurement of vibration amplitude and frequency of a vibrating body, by physical contact therewith. For non-contact measurement, lasers are used, but such equipment is bulky and cumbersome in use. The object of this invention is to propose a compact ultrasonic device for non-contact measurement of amplitude and frequency of the surface of a vibrating body, which is simple in its construction and easy in operation. This invention has wide and varied uses, such as, for the determination of machinery vibrations, for the measurement of vibrations at inaccessible points, vibrations of the earth, for material characterization, and in non-destructive testing, for particle movement profiling of fluids, for measurement of sub-micron movement / changes of particles / surface / structure due to physical field variations of temperature, gravitational, magnetic, electrostatic and force field which in turn can be used for the measurement of above mentioned physical quantities The device for measuring the vibration amplitude and frequency of a vibrating body without physical contact therewith, according to this invention, comprises an ultrasonic transmitter for transmitting ultrasonic waves such that the said waves are incident on the surface of the said body, said transmitter consisting of a signal generator, power amplifier and an ultrasonic transmitting transducer; an ultrasonic receiver for picking up the vibrations of the said surface, said receiver consisting of an ultrasonic receiving transducer, a signal conditioner, a digitizer, and a digital signal processing unit for furnishing an output signal of the amplitude and frequency of vibration of the said vibrating body. Various other features of this invention will be apparent from the following description thereof with reference to the accompanying drawings which illustrate by way of example, and not by way of limitation, one of possible embodiments of the device proposed herein. Fig. 1 illustrates the vibrating surface S of a body. A transmitting transducer Tx produces an incident ultrasonic wave Pi(t) on the said surface while a receiving transducer Rx receives the reflected ultrasonic wave pr(t) from the said surface. The velocity of vibration is indicated by v(t). $ is the intersection angle between the target velocity and the incident ultrasonic wave pi(t). Fig. 2 illustrates a circuit layout of the embodiment and Fig.3 illustrates a separate circuit layout of the digital signal processing unit. The transducer referred to in this specification is an ultrasonic transducer which generates pressure waves in the medium in which it is kept whenever electrical energy is applied to its terminals and/or generates electrical energy at its terminals whenever pressure waves impinge on its face. The ultrasonic transmitter consists of a signal generator B, power amplifier P and an ultrasonic transmitting transducer Tx for transmitting ultrasonic waves on to the surface S of the body. The signal generator B generates a predetermined signal which undergoes power amplification before being fed to the transducer Tx. The ultrasonic receiver receives the ultrasonic waves reflected from the surface S. The said receiver consists of an ultrasonic receiving transducer Rx. a signal conditioner C, a digitizer E, and a digital signal processing unit G for furnishing an output signal of the amplitude and frequency of vibration of the vibrating body. The digital signal processing unit G includes digital signal processors such as FIR filters H and correlation based demodulator J for demodulating the incoming signal and furnishing the vibration signal. The terms and expressions herein are of description and not of limitation since various other embodiments of this invention are possible without departing from the scope and ambit of this invention. We Claim: 1 .A device for measuring the vibration amplitude and frequency of a vibrating body without physical contact therewith comprising an ultrasonic transmitter for transmitting ultrasonic waves such that the said waves are incident on the surface of the said body, said transmitter consisting of a signal generator, power amplifier and an ultrasonic transmitting transducer; an ultrasonic receiver for picking up the vibrations of the said surface, said receiver consisting of an ultrasonic receiving transducer, a signal conditioner, a digitizer, and a digital signal processing unit for furnishing an output signal of the amplitude and frequency of vibration of the vibrating body. 2. A device as claimed in Claim 1 wherein the digital signal processing unit consists digital signal processor, FIR filters and correlation based phase demodulator.. 3.A device for measuring the vibration amplitude and frequency of a vibrating body without physical contact therewith, substantially as herein described with reference to, and as illustrated in, the accompanying drawings.

Full Text

.'This invention relates to a device for measuring the vibration amplitude and frequency of a vibrating body without physical contact therewith.
Conventionally, accelerometers and geophones (for ground vibrations) are employed for the measurement of vibration amplitude and frequency of a vibrating body, by physical contact therewith. For non-contact measurement, lasers are used, but such equipment is bulky and cumbersome in use.
The object of this invention is to propose a compact ultrasonic device for non-contact measurement of amplitude and frequency of the surface of a vibrating body, which is simple in its construction and easy in operation.
This invention has wide and varied uses, such as, for the determination of machinery vibrations, for the measurement of vibrations at inaccessible points, vibrations of the earth, for material characterization, and in non-destructive testing, for particle movement profiling of fluids, for measurement of sub-micron movement / changes of particles / surface / structure due to physical field variations of temperature, gravitational, magnetic, electrostatic and force field which in turn can be used for the measurement of above mentioned physical quantities
The device for measuring the vibration amplitude and frequency of a vibrating body without physical contact therewith, according to this invention, comprises an ultrasonic

transmitter for transmitting ultrasonic waves such that the said waves are incident on the surface of the said body, said transmitter consisting of a signal generator, power amplifier and an ultrasonic transmitting transducer; an ultrasonic receiver for picking up the vibrations of the said surface, said receiver consisting of an ultrasonic receiving transducer, a signal conditioner, a digitizer, and a digital signal processing unit for furnishing an output signal of the amplitude and frequency of vibration of the said vibrating body.
Various other features of this invention will be apparent from
the following description thereof with reference to the
accompanying drawings which illustrate by way of example,
and not by way of limitation, one of possible embodiments of
the device proposed herein.
Fig. 1 illustrates the vibrating surface S of a body. A
transmitting transducer Tx produces an incident ultrasonic wave
Pi(t) on the said surface while a receiving transducer Rx
receives the reflected ultrasonic wave pr(t) from the said
surface. The velocity of vibration is indicated by v(t).
$ is the intersection angle between the target velocity and the
incident ultrasonic wave pi(t).
Fig. 2 illustrates a circuit layout of the embodiment
and Fig.3 illustrates a separate circuit layout of the digital signal processing unit.
The transducer referred to in this specification is an ultrasonic transducer which generates pressure waves in the medium in

which it is kept whenever electrical energy is applied to its terminals and/or generates electrical energy at its terminals whenever pressure waves impinge on its face.
The ultrasonic transmitter consists of a signal generator B, power amplifier P and an ultrasonic transmitting transducer Tx for transmitting ultrasonic waves on to the surface S of the body. The signal generator B generates a predetermined signal which undergoes power amplification before being fed to the transducer Tx.
The ultrasonic receiver receives the ultrasonic waves reflected from the surface S. The said receiver consists of an ultrasonic receiving transducer Rx. a signal conditioner C, a digitizer E, and a digital signal processing unit G for furnishing an output signal of the amplitude and frequency of vibration of the vibrating body.
The digital signal processing unit G includes digital signal processors such as FIR filters H and correlation based demodulator J for demodulating the incoming signal and furnishing the vibration signal.
The terms and expressions herein are of description and not of limitation since various other embodiments of this invention are possible without departing from the scope and ambit of this invention.

We Claim:
1 .A device for measuring the vibration amplitude and frequency of a vibrating body without physical contact therewith comprising an ultrasonic transmitter for transmitting ultrasonic waves such that the said waves are incident on the surface of the said body, said transmitter consisting of a signal generator, power amplifier and an ultrasonic transmitting transducer; an ultrasonic receiver for picking up the vibrations of the said surface, said receiver consisting of an ultrasonic receiving transducer, a signal conditioner, a digitizer, and a digital signal processing unit for furnishing an output signal of the amplitude and frequency of vibration of the vibrating body.
2. A device as claimed in Claim 1 wherein the digital signal processing unit consists digital signal processor, FIR filters and correlation based phase demodulator..
3.A device for measuring the vibration amplitude and frequency of a vibrating body without physical contact therewith, substantially as herein described with reference to, and as illustrated in, the accompanying drawings.

Documents:

1373-CHE-2007 AMENDED CLAIMS 22-09-2011.pdf

1373-CHE-2007 AMENDED PAGES OF SPECIFICATION 22-09-2011.pdf

1373-CHE-2007 CORRESPONDENCE OTHERS 22-09-2011.pdf

1373-CHE-2007 POWER OF ATTORNEY 22-09-2011.pdf

1373-che-2007-claims.pdf

1373-che-2007-correspondnece-others.pdf

1373-che-2007-description(complete).pdf

1373-che-2007-drawings.pdf

1373-che-2007-form 1.pdf

1373-che-2007-form 18.pdf

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Patent Number

250216

Indian Patent Application Number

1373/CHE/2007

PG Journal Number

51/2011

Publication Date

23-Dec-2011

Grant Date

16-Dec-2011

Date of Filing

27-Jun-2007

Name of Patentee

CENTRE FOR DEVELOPMENT OF ADVANCED COMPUTING

Applicant Address

VELLAYAMBALAM THIRUVANANTHAPURA 695033,KERALA,INDIA.

Inventors:

#	Inventor's Name	Inventor's Address
1	MURALI RAMANKUTTY	CENTRE FOR DEVELOPMENT OF ADVANCED COMPUTING VELLAYAMBALAM THIRUVANANTHAPURA 695033,KERALA,INDIA
2	RAJESH KALLUVETTAMKUZHI RAMACHANDRAN PILLAI	CENTRE FOR DEVELOPMENT OF ADVANCED COMPUTING VELLAYAMBALAM THIRUVANANTHAPURA 695033,KERALA,INDIA
3	MOHANACHANDRAN RAGHAVAPANICKER	CENTRE FOR DEVELOPMENT OF ADVANCED COMPUTING VELLAYAMBALAM THIRUVANANTHAPURA 695033,KERALA,INDIA.

PCT International Classification Number

F16F9/50

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA