US3651431A - Zero temperature coefficient ultrasonic transmission medium having temporal stability - Google Patents

Zero temperature coefficient ultrasonic transmission medium having temporal stability Download PDF

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Publication number
US3651431A
US3651431A US821693A US3651431DA US3651431A US 3651431 A US3651431 A US 3651431A US 821693 A US821693 A US 821693A US 3651431D A US3651431D A US 3651431DA US 3651431 A US3651431 A US 3651431A
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US
United States
Prior art keywords
pbo
mole
bao
sio2
mole ratio
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Expired - Lifetime
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US821693A
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English (en)
Inventor
John T Krause
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AT&T Inc
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Bell Telephone Laboratories Inc
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/102—Glass compositions containing silica with 40% to 90% silica, by weight containing lead
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C4/00—Compositions for glass with special properties
    • C03C4/0057—Compositions for glass with special properties for ultrasonic delay lines glass
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
    • H03H9/30—Time-delay networks
    • H03H9/36—Time-delay networks with non-adjustable delay time

Definitions

  • An ultrasonic delay line having as the delay medium a glass of the nominal composition in mole per cent 17 per cent lead oxide, 95 per cent barium oxide and 73.5 per cent silicon dioxide, exhibits an average temperature coefiicient of delay time 1 of not more than about :5 parts per million per degrees centigrade over the range 0 to 100 C., a thermal after-efi'ect of not more than about 10 p.p.m., and an aging of delay time of not more than -10 parts per million per decade (decade is an order of magnitude of time in days).
  • T.C. temperature coefficient
  • a new glass ultrasonic transmission medium has been discovered, which has the nominal composition in mole per cent 17 per cent lead oxide, 9.5 per cent barium oxide and 73.5 per cent silicon dioxide.
  • This glass not only exhibits near zero temperature coefficient of delay time over the normally encountered temperature range of 0 to 100 C., but also exhibits substantial independence of thermal after-effects and of aging of delay time with the thermal history. That is, the thermal after-effect is not greater than p.p.m. and the aging of delay time is less than l0 parts per million per decade of time, regardless of prior thermal treatment, thus making the glass suitable for critical ultrasonic applications, such as the delay medium in ultrasonic delay lines, without the need for a final thermal treatment of the glass.
  • FIG. 1 is a graph depicting BaO-PbO-SiO, glass compositions which are useful as ultrasonic transmission media according to the invention
  • FIG. 2 is a schematic illustration of a delay line assembly incorporating the inventive material as a delay medium.
  • FIG. 1 graphically illustrates the family of BaO-PbO-SiO, glasses which exhibit an average temperature coefficient of delay time of a maximum of :5 parts per million per degrees centigrade over the range 0 to 100 C. It has been determined that this family of glasses exhibit thermal after-effects not greater than 10 ppm. and an aging of delay time (temporal instability) of not more than l0 parts per million per decade.
  • the average temperature coefficient of delay time from 0 to 100 C. is plotted along the vertical axis and the mole ratio of PhD to [PhD Si0,] is plotted along the horizontal axis for three different series of compositions, each having a different 2. 11.0 mole percent BaO, 0.189 mole ratio PbO/[Pb0+ SiO,] and 8.0 mole percent BaO, 0.221 mole ratio PbO/[ 2];
  • compositions fall within a much broader glass-forming region of the ternary diagram roughly defined by the ranges in mole per cent 0 to 40 BaO, 0m 60 PbO and 40 to SiO, Within this parallelogram, the thermal after-effect and the aging of delay time is substantially independent of the glasses thermal histories and does not exceed 10 p.p.m. and -l0 parts per million per decade respectively. Varying the BaO content so as to result in compositions outside the parallelogram adjacent to lines B or C may result in devitrification of the melt. Increasing the PbO content at the expense of S10, increases the temperature coefficient of delay time linearly, as may be seen from FIG. 1.
  • compositions within the parallelogram defined by lines B, C, F and G are preferred for their average temperature coefficients of delay time of not more than :2 parts per million per degrees centigrade. These compositions fall within an area of the ternary diagram formed by connecting with straight lines the following point pairs:
  • minor amounts of additives or impurities, exclusive of the Group I alkali metals Li, Na, K, Rb, Cs, typically up to about 1 mole per cent total, may be present in the glass compositions without adversely affecting the acoustic properties.
  • fining agents such as Asp, or Sb,0 typically up to 1 mole per cent may be present.
  • the alkali metals should not be present in amounts greater than about 0.1 cation per cent, in order to avoid adverse thermal after-effects or aging.
  • the described glasses may be produced in any suitable manner known to the glass-making art, although some advantage may be gained by following the known methods of producing optical quality glass. Also a fine anneal may be desirable in reducing the level of acoustic loss. Although not a necessary part of this description, a fine anneal is described in US. Pat. No. 3,173,780, issued to H. C. Hoover on Mar. 16, 1965.
  • the molten glass may be shaped into blanks having roughly the desired form and subsequently finished by the usual cutting, grinding and polishing steps.
  • the blanks may be annealed according to steps known in the glass-making art.
  • thermal after-effects and temporal instabilities are minimal and are substantially unaffected by the character of the anneal or other prior or post-thermal treatment.
  • Samples suitable for the obtaining of acoustic properties were prepared by optically polishing flat and parallel the opposite ends of %-inch diameter right cylinders 1 inch in length. These were processed into one-ended delay lines and measured for the appropriate acoustic properties using pulse-echo techniques. The thermal aftereffect was determined by measuring the unit delay time at 25 C. before and after an 18- hour soak at 125 C. Temporal instability was then measured at 25 C. as a function of time over a several-hundred-day period.
  • Shear Delay Time Temporal instability Thermal After-effect Temperature Coeflicient of Delay Time (from C. to 100 C.) Shear Attenuation (at 50 MHz) 2.5 decibels/centimeter Frequency Dependency of ,1.3
  • a solid ultrasonic delay line comprising a solid ultrasonic transmission medium, means for converting electrical signals to acoustic pulses comprising two piezoelectric transducers affixed to opposite faces of said medium, and electrical input and output means attached to said transducers, characterized in that said transmission medium is a bariumlead-silicate glass having an average temperature coefficient of delay time of up to 5 parts per million per degrees centigrade, a thermal after-effect of less than 10 parts per million per decade and consisting essentially of a composition within an area of the .ternary diagram for barium oxide, lead oxide and silicon dioxide formed by connecting with straight lines the following point pairs:
  • said transmission medium additionally containing up to one percent of one or more fining agents selected from the group consisting of AS203 and Sb O and not more than one-tenth cation percent of the Group I alkali metals.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Glass Compositions (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
US821693A 1969-05-05 1969-05-05 Zero temperature coefficient ultrasonic transmission medium having temporal stability Expired - Lifetime US3651431A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US82169369A 1969-05-05 1969-05-05

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US3651431A true US3651431A (en) 1972-03-21

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US (1) US3651431A (enExample)
JP (1) JPS4946128B1 (enExample)
BE (1) BE749797A (enExample)
DE (1) DE2022046B2 (enExample)
FR (1) FR2047280A5 (enExample)
GB (1) GB1304712A (enExample)
NL (1) NL7006344A (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3783416A (en) * 1969-12-22 1974-01-01 Owens Illinois Inc Solid ultrasonic delay lines and glass compositions therefor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5341526U (enExample) * 1976-09-14 1978-04-10

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3154425A (en) * 1961-06-19 1964-10-27 Corning Glass Works Temperature stable ultrasonic delay lines
FR1383962A (fr) * 1962-11-30 1965-01-04 Western Electric Co Ligne ultrasonique à retard
GB1118422A (en) * 1965-04-15 1968-07-03 Philips Electronic Associated Improvements relating to acoustic delay lines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3154425A (en) * 1961-06-19 1964-10-27 Corning Glass Works Temperature stable ultrasonic delay lines
FR1383962A (fr) * 1962-11-30 1965-01-04 Western Electric Co Ligne ultrasonique à retard
GB1118422A (en) * 1965-04-15 1968-07-03 Philips Electronic Associated Improvements relating to acoustic delay lines

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Argyle, J. F. and Hummel, F. A., The System PbO BaO MgO SiO 2 I, Phase Studies in Subsidiary Ternary Systems, Glass Industry 46(10) pp. 583 587 and 627, 1965 October. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3783416A (en) * 1969-12-22 1974-01-01 Owens Illinois Inc Solid ultrasonic delay lines and glass compositions therefor

Also Published As

Publication number Publication date
DE2022046A1 (de) 1971-04-29
GB1304712A (enExample) 1973-01-31
DE2022046B2 (de) 1971-10-21
NL7006344A (enExample) 1970-11-09
JPS4946128B1 (enExample) 1974-12-07
FR2047280A5 (enExample) 1971-03-12
BE749797A (fr) 1970-10-01

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