GB2020816A - Capacitive Measuring System with Automatic Calibration Means - Google Patents

Capacitive Measuring System with Automatic Calibration Means

Info

Publication number
GB2020816A
GB2020816A GB7913803A GB7913803A GB2020816A GB 2020816 A GB2020816 A GB 2020816A GB 7913803 A GB7913803 A GB 7913803A GB 7913803 A GB7913803 A GB 7913803A GB 2020816 A GB2020816 A GB 2020816A
Authority
GB
United Kingdom
Prior art keywords
signal
auto
filament
digital output
measurement signal
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.)
Granted
Application number
GB7913803A
Other versions
GB2020816B (en
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.)
MICRO SENSORS Inc
Original Assignee
MICRO SENSORS Inc
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 MICRO SENSORS Inc filed Critical MICRO SENSORS Inc
Publication of GB2020816A publication Critical patent/GB2020816A/en
Application granted granted Critical
Publication of GB2020816B publication Critical patent/GB2020816B/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
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/36—Textiles
    • G01N33/365—Filiform textiles, e.g. yarns
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
    • G01B7/08—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using capacitive means
    • G01B7/087—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using capacitive means for measuring of objects while moving
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
    • G01D18/002—Automatic recalibration
    • G01D18/004—Continuous recalibration
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
    • G01D18/008—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00 with calibration coefficients stored in memory
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R17/00—Measuring arrangements involving comparison with a reference value, e.g. bridge
    • G01R17/10—AC or DC measuring bridges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2605—Measuring capacitance

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

In a device for continuously monitoring the denier of a moving yarn filament, by passing the filament through a capacitive sensor 12B to develop an electrical signal representing an absolute measurement of the filament with reference to a prescribed datum, signal drift arising from contamination of the capacitive sensor is obviated by developing compensating signals to be combined with the filament measurement signal. The compensating signals are developed in circuit (20B), including an auto-zero circuit and an auto-gain circuit, which receives the measurement signal from the capacitive sensor. While the sensor is vacant, the auto-zero circuit digitally counts at 78 clock pulses to generate a digital output, converts the digital output into a corresponding analog signal (80) detects a prescribed comparison at 84 between the analog signal and the measurement signal, and stops the count at a zero compensating value when the comparison is detected. Then, the auto-gain circuit applies an unbalanced drive to the sensor by closing switch 92, digitally counts at 98 clock pulses to generate a digital output, and varies the measurement signal gain at 100 with the digital output. When a prescribed comparison at 104 between the gain- adjusted measurement signal and a standardized output signal is detected, the count is stopped. <IMAGE>
GB7913803A 1977-08-09 1979-04-20 Capacitive measuring system with automatic calibration means Expired GB2020816B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US82310777A 1977-08-09 1977-08-09

Publications (2)

Publication Number Publication Date
GB2020816A true GB2020816A (en) 1979-11-21
GB2020816B GB2020816B (en) 1983-02-02

Family

ID=25237821

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7913803A Expired GB2020816B (en) 1977-08-09 1979-04-20 Capacitive measuring system with automatic calibration means

Country Status (1)

Country Link
GB (1) GB2020816B (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0069352A1 (en) * 1981-07-06 1983-01-12 CSELT Centro Studi e Laboratori Telecomunicazioni S.p.A. Process and apparatus for measuring optical-fibre diameter
EP0036280B1 (en) * 1980-03-10 1984-06-27 Merrill Engineering Laboratories, Inc. Calibration fault detector and automatic calibrator
EP0491545A1 (en) * 1990-12-19 1992-06-24 Emhart Glass Machinery Investments Inc. Machine for inspecting the wall thickness of glass bottles
WO1995018357A1 (en) * 1993-12-30 1995-07-06 Honeywell Inc. Embedded programmable sensor calibration apparatus
EP0590503A3 (en) * 1992-10-01 1997-04-23 Zellweger Uster Ag Capacitive sensor for the determiniation of variations in mass and/or diameter of a stretch of textile sample
EP0769687A1 (en) * 1995-10-18 1997-04-23 Lenzing Aktiengesellschaft Method for determining the mass per unit length for natural or synthetic filaments or fibres and device for carrying out this method
FR2751407A1 (en) * 1996-07-16 1998-01-23 Motorola Semiconducteurs Threshold detector, for water level in washing machine or dish-washer
WO1999038019A1 (en) * 1998-01-23 1999-07-29 Sumitomo Metal Industries, Ltd. Static capacitance-to-voltage converter and converting method
US6194888B1 (en) 1998-02-05 2001-02-27 Sumitomo Metal Industries Limited Impedance-to-voltage converter and converting method
EP1124134A2 (en) * 2000-02-11 2001-08-16 Zuccolini, Livio Process an apparatus for measuring the count of yarns
US6326795B1 (en) 1998-02-19 2001-12-04 Sumitomo Metal Industries, Ltd. Capacitance detection system and method
US6828806B1 (en) 1999-07-22 2004-12-07 Sumitomo Metal Industries, Ltd. Electrostatic capacitance sensor, electrostatic capacitance sensor component, object mounting body and object mounting apparatus

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0036280B1 (en) * 1980-03-10 1984-06-27 Merrill Engineering Laboratories, Inc. Calibration fault detector and automatic calibrator
EP0069352A1 (en) * 1981-07-06 1983-01-12 CSELT Centro Studi e Laboratori Telecomunicazioni S.p.A. Process and apparatus for measuring optical-fibre diameter
US4523938A (en) * 1981-07-06 1985-06-18 Cselt - Centro Studi E Laboratori Telecomunicazioni S.P.A. Method of and apparatus for continuously monitoring diameter variations of an optical fiber being drawn
EP0491545A1 (en) * 1990-12-19 1992-06-24 Emhart Glass Machinery Investments Inc. Machine for inspecting the wall thickness of glass bottles
EP0590503A3 (en) * 1992-10-01 1997-04-23 Zellweger Uster Ag Capacitive sensor for the determiniation of variations in mass and/or diameter of a stretch of textile sample
WO1995018357A1 (en) * 1993-12-30 1995-07-06 Honeywell Inc. Embedded programmable sensor calibration apparatus
EP0769687A1 (en) * 1995-10-18 1997-04-23 Lenzing Aktiengesellschaft Method for determining the mass per unit length for natural or synthetic filaments or fibres and device for carrying out this method
FR2751407A1 (en) * 1996-07-16 1998-01-23 Motorola Semiconducteurs Threshold detector, for water level in washing machine or dish-washer
WO1999038019A1 (en) * 1998-01-23 1999-07-29 Sumitomo Metal Industries, Ltd. Static capacitance-to-voltage converter and converting method
AU724788B2 (en) * 1998-01-23 2000-09-28 Hokuto Electronics, Inc. Static capacitance-to-voltage converter and converting method
US6331780B1 (en) 1998-01-23 2001-12-18 Sumitomo Metal Industries Ltd. Static capacitance-to-voltage converter and converting method
US6335642B1 (en) 1998-01-23 2002-01-01 Sumitomo Metal Industries Limited Impedance-to-voltage converter
US6194888B1 (en) 1998-02-05 2001-02-27 Sumitomo Metal Industries Limited Impedance-to-voltage converter and converting method
US6326795B1 (en) 1998-02-19 2001-12-04 Sumitomo Metal Industries, Ltd. Capacitance detection system and method
US6828806B1 (en) 1999-07-22 2004-12-07 Sumitomo Metal Industries, Ltd. Electrostatic capacitance sensor, electrostatic capacitance sensor component, object mounting body and object mounting apparatus
US7161360B2 (en) 1999-07-22 2007-01-09 Tokyo Electron Ltd. Electrostatic capacitance sensor, electrostatic capacitance sensor component, object mounting body and object mounting apparatus
EP1124134A2 (en) * 2000-02-11 2001-08-16 Zuccolini, Livio Process an apparatus for measuring the count of yarns
EP1124134A3 (en) * 2000-02-11 2002-11-06 Zuccolini, Livio Process and apparatus for measuring the count of yarns

Also Published As

Publication number Publication date
GB2020816B (en) 1983-02-02

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee