GB907240A - Vibrating string transducer devices and systems for employing the same - Google Patents

Vibrating string transducer devices and systems for employing the same

Info

Publication number
GB907240A
GB907240A GB264959A GB264959A GB907240A GB 907240 A GB907240 A GB 907240A GB 264959 A GB264959 A GB 264959A GB 264959 A GB264959 A GB 264959A GB 907240 A GB907240 A GB 907240A
Authority
GB
United Kingdom
Prior art keywords
frequency
difference
vibrating
wires
acceleration
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
GB264959A
Inventor
Paul J Holmes
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.)
Borg Warner Corp
Original Assignee
Borg Warner Corp
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 Borg Warner Corp filed Critical Borg Warner Corp
Priority to GB264959A priority Critical patent/GB907240A/en
Publication of GB907240A publication Critical patent/GB907240A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/10—Measuring force or stress, in general by measuring variations of frequency of stressed vibrating elements, e.g. of stressed strings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
    • G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
    • G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
    • G01P15/097—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by vibratory elements
    • G01P15/10—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by vibratory elements by vibratory strings

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

907,240. Measuring electrically. BORGWARNER CORPORATION. Jan. 23, 1959, No. 2649/59. Class 40 (1). In apparatus for measuring acceleration comprising an inertia mass 46 supported on a diaphragm 48 and attached to two substantially similar conductive strings 12, 14 which pass between the poles of permanent magnets 60, 62 and 68 and are maintained vibrating at their natural frequency, whereby any difference in frequency is indicative of the force acting on mass 46, e.g. due to acceleration, a linear relationship between frequency difference and acceleration is produced by keeping the sum of the two vibrating frequencies constant. As shown, the strings 12, 14 are maintained vibrating by amplifiers 16, 18 respectively, the vibrating frequencies being combined at 32 and their difference selected by a low-pass filter 33 for indication on a meter 34. With no force acting on mass 46, string 12 will vibrate at twice the frequency of string 14, because of the double magnet 60, 62; hence the difference in frequency will increase or decrease depending on the direction of the acceleration or force applied to mass 46. The frequency of the output from amplifier 18 is also doubled at 22 and mixed again at 20 with that from amplifier 16, the sum of the two frequencies being selected by band-pass filter 24 and compared with a constant reference frequency signal from oscillator 28 to give an error voltage when they differ, which is amplified at 30 and fed to an electromagnet 70 acting on the support 66 for one end of the wire 14, causing the stress in both wires to rise until the sum of the two vibrating frequencies is again equal to that of the oscillator 28. The system automatically compensates for variations due to e.g. changes in temperature. In an alternative arrangement the output current from amplifier 30 is fed through a heating coil to increase the stress in wires 12, 14, or directly through the wires to heat them. In a modified usage the change in stress in the wires 12, 14 is produced by a difference in fluid pressure on opposite sides of the diaphragm 48, the pressure difference being indicated on meter 34. Specification 880,361 is referred to.
GB264959A 1959-01-23 1959-01-23 Vibrating string transducer devices and systems for employing the same Expired GB907240A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB264959A GB907240A (en) 1959-01-23 1959-01-23 Vibrating string transducer devices and systems for employing the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB264959A GB907240A (en) 1959-01-23 1959-01-23 Vibrating string transducer devices and systems for employing the same

Publications (1)

Publication Number Publication Date
GB907240A true GB907240A (en) 1962-10-03

Family

ID=9743301

Family Applications (1)

Application Number Title Priority Date Filing Date
GB264959A Expired GB907240A (en) 1959-01-23 1959-01-23 Vibrating string transducer devices and systems for employing the same

Country Status (1)

Country Link
GB (1) GB907240A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100549644C (en) * 2006-12-26 2009-10-14 河海大学 Vibrating chord type dynamometer of hollow anchor bar
CN101603868B (en) * 2009-07-12 2011-02-09 邓铁六 High-accuracy vibrating wire pressure sensor
CN107246901A (en) * 2017-07-10 2017-10-13 太原师范学院 Coal bunker material-level detection system and method based on Chord vibration

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100549644C (en) * 2006-12-26 2009-10-14 河海大学 Vibrating chord type dynamometer of hollow anchor bar
CN101603868B (en) * 2009-07-12 2011-02-09 邓铁六 High-accuracy vibrating wire pressure sensor
CN107246901A (en) * 2017-07-10 2017-10-13 太原师范学院 Coal bunker material-level detection system and method based on Chord vibration
CN107246901B (en) * 2017-07-10 2023-06-30 太原师范学院 Coal bunker material level detection system and method based on string vibration

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