GB1188257A - Ultrasonic Delay Line - Google Patents

Ultrasonic Delay Line

Info

Publication number
GB1188257A
GB1188257A GB2846768A GB2846768A GB1188257A GB 1188257 A GB1188257 A GB 1188257A GB 2846768 A GB2846768 A GB 2846768A GB 2846768 A GB2846768 A GB 2846768A GB 1188257 A GB1188257 A GB 1188257A
Authority
GB
United Kingdom
Prior art keywords
crystal
portions
path
delay
temperature coefficient
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
GB2846768A
Inventor
Rodney William Gibson
William Willis
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.)
Philips Components Ltd
Original Assignee
Mullard 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 Mullard Ltd filed Critical Mullard Ltd
Priority to GB2846768A priority Critical patent/GB1188257A/en
Priority to FR6919507A priority patent/FR2010892A1/fr
Priority to DE19691930248 priority patent/DE1930248A1/en
Publication of GB1188257A publication Critical patent/GB1188257A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H03H9/36—Time-delay networks with non-adjustable delay time

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)

Abstract

1,188,257. Electromechanical delay lines. MULLARD Ltd. 13 May, 1969 [14 June, 1968], No. 28467/68. Heading H3U. A delay line having a delay time unaffected by temperature variations comprises, Fig. 1, a delay body 1 formed by an anisotropic crystal, e.g. a single crystal of quartz, having shear mode input and output transducers 2, 3 of quartz. The wave path 4 between the transducers 2, 3 includes reflections at the crystal faces 5, 6, 7 and has portions 8 having a positive temperature coefficient of velocity for ultrasonic waves and portions 9 having a negative coefficient. The crystal is cut so that these two coefficients are equal and since the path lengths of the portions 8 and 9 are equal the delay time is temperature-independent. In another embodiment, Fig. 2, the two path lengths of the portions 8 and 9 are in the ratio 6:1 and the crystal is cut so that the negative temperature coefficient of velocity of path 9 is six times the positive temperature coefficient of path 8.
GB2846768A 1968-06-14 1968-06-14 Ultrasonic Delay Line Expired GB1188257A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB2846768A GB1188257A (en) 1968-06-14 1968-06-14 Ultrasonic Delay Line
FR6919507A FR2010892A1 (en) 1968-06-14 1969-06-12
DE19691930248 DE1930248A1 (en) 1968-06-14 1969-06-13 Ultrasonic delay line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2846768A GB1188257A (en) 1968-06-14 1968-06-14 Ultrasonic Delay Line

Publications (1)

Publication Number Publication Date
GB1188257A true GB1188257A (en) 1970-04-15

Family

ID=10276099

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2846768A Expired GB1188257A (en) 1968-06-14 1968-06-14 Ultrasonic Delay Line

Country Status (3)

Country Link
DE (1) DE1930248A1 (en)
FR (1) FR2010892A1 (en)
GB (1) GB1188257A (en)

Also Published As

Publication number Publication date
FR2010892A1 (en) 1970-02-20
DE1930248A1 (en) 1970-01-29

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees