GB1002280A - Elastic wave generator and amplifier - Google Patents

Elastic wave generator and amplifier

Info

Publication number
GB1002280A
GB1002280A GB11766/62A GB1176662A GB1002280A GB 1002280 A GB1002280 A GB 1002280A GB 11766/62 A GB11766/62 A GB 11766/62A GB 1176662 A GB1176662 A GB 1176662A GB 1002280 A GB1002280 A GB 1002280A
Authority
GB
United Kingdom
Prior art keywords
spin
waves
microwave
modes
disc
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB11766/62A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Raytheon Co
Original Assignee
Raytheon Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Raytheon Co filed Critical Raytheon Co
Publication of GB1002280A publication Critical patent/GB1002280A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/22—Details, e.g. general constructional or apparatus details
    • G01N29/24—Probes
    • G01N29/2431—Probes using other means for acoustic excitation, e.g. heat, microwaves, electron beams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/04—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with electromagnetism
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • G01N29/12—Analysing solids by measuring frequency or resonance of acoustic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/22—Details, e.g. general constructional or apparatus details
    • G01N29/24—Probes
    • G01N29/2412—Probes using the magnetostrictive properties of the material to be examined, e.g. electromagnetic acoustic transducers [EMAT]
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F7/00—Parametric amplifiers
    • H03F7/02—Parametric amplifiers using variable-inductance element; using variable-permeability element
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/30—Time-delay networks
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/26—Automatic control of frequency or phase; Synchronisation using energy levels of molecules, atoms, or subatomic particles as a frequency reference
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/04—Wave modes and trajectories
    • G01N2291/042—Wave modes
    • G01N2291/0421—Longitudinal waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/04—Wave modes and trajectories
    • G01N2291/042—Wave modes
    • G01N2291/0422—Shear waves, transverse waves, horizontally polarised waves

Landscapes

  • Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Microwave Tubes (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

1,002,280. Electromechanical delay lines and amplifiers. RAYTHEON CO. March 27, 1962 [Sept. 1, 1961], No. 11766/62. Heading H3U. A delay line for use in the kilo-megacycle range makes use of a body of microwave gyromagnetic material in which are produced resonant magnetic spin modes of oscillation, these being coupled to longitudinal or shear-mode elastic waves in the body. As shown (Fig. 1), a microwave field h is excited in a rectangular cavity 15 coupled to an input waveguide by an iris 14. Situated opposite the iris is a disc 16 of yttrium iron garnet subject to a biasing field H produced by an electromagnet 29. The so-called " spin-modes " utilized in the invention are associated with the non-linear saturation effects obtained during ferromagnetic resonance and are to be distinguished from the uniform spin precession mode. The wave member (or inverse wavelength) of such modes is given by Dk<SP>2</SP> sp = He - H, where D is a constant, k sp is the wave member and He is a limiting value of H for the spin modes and corresponds to the value of biasing field necessary for ferromagnetic resonance. The frequency of the spin mode generated depends upon the frequency of the microwave field and, under the conditions shown, is one half of the latter. It is stated in the Specification that coupling takes place between the spin waves and elastic waves in the body when the frequency and wave member of the two waves are substantially equal. Since the wave member of the spin wave depends upon the biasing field, this may be adjusted until coupling takes place and a magneto elastic waves are generated. The waves are substantially independent of the dimensions of the body 16. They give rise to shear or longitudinal mechanical waves in a quartz rod 19 which extends into a re-entrant cavity 22 where microwave oscillations are generated piezoelectrically. The quartz rod (which acts as a delay line) is supported in a tube 21 of PTFE which also surrounds the YIG disc 16. The disc and the rod are welded together with indium. In a modification described as an amplifier, two quartz rods respectively providing input and output mechanical-wave transducers are used. Both are coupled to a YIG disc situated in a microwave cavity. It is stated that, in all cases, the apparatus may be cooled by a liquid gas in order to reduce attenuation.
GB11766/62A 1961-09-01 1962-03-27 Elastic wave generator and amplifier Expired GB1002280A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13563761A 1961-09-01 1961-09-01

Publications (1)

Publication Number Publication Date
GB1002280A true GB1002280A (en) 1965-08-25

Family

ID=22468962

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11766/62A Expired GB1002280A (en) 1961-09-01 1962-03-27 Elastic wave generator and amplifier

Country Status (4)

Country Link
DE (1) DE1212172B (en)
FR (1) FR1336120A (en)
GB (1) GB1002280A (en)
NL (1) NL277090A (en)

Also Published As

Publication number Publication date
FR1336120A (en) 1963-08-30
NL277090A (en) 1900-01-01
DE1212172B (en) 1966-03-10

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