GB1175947A - Ultrasonic Transducers - Google Patents

Ultrasonic Transducers

Info

Publication number
GB1175947A
GB1175947A GB3994268A GB3994268A GB1175947A GB 1175947 A GB1175947 A GB 1175947A GB 3994268 A GB3994268 A GB 3994268A GB 3994268 A GB3994268 A GB 3994268A GB 1175947 A GB1175947 A GB 1175947A
Authority
GB
United Kingdom
Prior art keywords
cup
crystal
transducer
annulus
circumferential
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
GB3994268A
Inventor
Joseph Donald Parker
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.)
Electro Mechanical Design Ltd
Original Assignee
Electro Mechanical Design Ltd
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 Electro Mechanical Design Ltd filed Critical Electro Mechanical Design Ltd
Priority to GB3994268A priority Critical patent/GB1175947A/en
Publication of GB1175947A publication Critical patent/GB1175947A/en
Expired legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01M—CATCHING, TRAPPING OR SCARING OF ANIMALS; APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS
    • A01M29/00—Scaring or repelling devices, e.g. bird-scaring apparatus
    • A01M29/16—Scaring or repelling devices, e.g. bird-scaring apparatus using sound waves
    • A01M29/18—Scaring or repelling devices, e.g. bird-scaring apparatus using sound waves using ultrasonic signals
    • 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
    • B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
    • B06B1/0644—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a single piezoelectric element
    • B06B1/0655—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a single piezoelectric element of cylindrical shape

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Birds (AREA)
  • Insects & Arthropods (AREA)
  • Pest Control & Pesticides (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Environmental Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Transducers For Ultrasonic Waves (AREA)

Abstract

1,175,947. Ultrasonic transducers. ELECTROMECHANICAL DESIGN Ltd. 21 Aug., 1968, No. 39942/68. Heading H4J. An ultrasonic transducer for repelling rodents, comprises an annular piezo-electric crystal 1 having electrodes 2 on its inner and outer surfaces and arranged to vibrate in the circumferential mode, and a radiating member 4 in the form of a cup fitted in the annulus, support means 5-7 for the transducer being provided at the bottom of the cup. The crystal is of barium titanate, lead zirconate or other polarized polycrystalline material and has silvered surfaces 2. The frequency of vibration of the crystal is arranged to be slightly (5%) higher than the final desired frequency of the transducer (20 kc./s.) to allow for the effect of the mass of air acting on the cup. The cup is of thermosetting plastics material and forms an interference fit in the annulus, final tuning being by grinding the rim of the open end of the cup. The support means is a bracket 5, bolt 6 and resilient washer 7 attached at a node (the centre of the base of the cup). In an alternative support arrangement designed to enhance the circumferential vibrational mode by restricting longitudinal vibration of the crystal 1, Fig. 2 (not shown), a plastic plate (8) is provided to bear on the base of the crystal. Two cups may be secured together coaxially on a common support to face in opposite directions, each being associated with an annular crystal.
GB3994268A 1968-08-21 1968-08-21 Ultrasonic Transducers Expired GB1175947A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3994268A GB1175947A (en) 1968-08-21 1968-08-21 Ultrasonic Transducers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3994268A GB1175947A (en) 1968-08-21 1968-08-21 Ultrasonic Transducers

Publications (1)

Publication Number Publication Date
GB1175947A true GB1175947A (en) 1970-01-01

Family

ID=10412334

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3994268A Expired GB1175947A (en) 1968-08-21 1968-08-21 Ultrasonic Transducers

Country Status (1)

Country Link
GB (1) GB1175947A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3663841A (en) * 1970-04-22 1972-05-16 Electro Mechanical Design Ltd Ultrasonic transducers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3663841A (en) * 1970-04-22 1972-05-16 Electro Mechanical Design Ltd Ultrasonic transducers

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