GB1120305A - Three detector cycle counting means - Google Patents

Three detector cycle counting means

Info

Publication number
GB1120305A
GB1120305A GB1200166A GB1200166A GB1120305A GB 1120305 A GB1120305 A GB 1120305A GB 1200166 A GB1200166 A GB 1200166A GB 1200166 A GB1200166 A GB 1200166A GB 1120305 A GB1120305 A GB 1120305A
Authority
GB
United Kingdom
Prior art keywords
outputs
areas
pair
phase
photomultipliers
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
GB1200166A
Inventor
Anwar Khadoury Chitayat
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.)
Optomechanisms Inc
Original Assignee
Optomechanisms 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 Optomechanisms Inc filed Critical Optomechanisms Inc
Priority to GB1200166A priority Critical patent/GB1120305A/en
Publication of GB1120305A publication Critical patent/GB1120305A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/22—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral
    • H03K5/26—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being duration, interval, position, frequency, or sequence
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B9/00—Measuring instruments characterised by the use of optical techniques
    • G01B9/02—Interferometers
    • G01B9/02055—Reduction or prevention of errors; Testing; Calibration
    • G01B9/02075—Reduction or prevention of errors; Testing; Calibration of particular errors
    • G01B9/02078—Caused by ambiguity
    • G01B9/02079—Quadrature detection, i.e. detecting relatively phase-shifted signals
    • G01B9/02081—Quadrature detection, i.e. detecting relatively phase-shifted signals simultaneous quadrature detection, e.g. by spatial phase shifting
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B2290/00—Aspects of interferometers not specifically covered by any group under G01B9/02
    • G01B2290/45—Multiple detectors for detecting interferometer signals

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

1,120,305. Electric selective signalling. OPTOMECHANISMS, Inc. 18 March, 1966, No. 12001/66. Heading G4H. Light from a source S, (Fig. 1) transmitted via a lens L 1 , prisms G, C 1 and a glass plate E to a further prism C 2 carried on a movable object X is delayed by the glass plate E by an amount of one sixth of a wavelength in areas 1 and 6 and by one third of a wavelength in areas 2 and 5 so that light waves from the areas 1, 6; 2, 5; and 3, 4; fed to photomultipliers F 1 , F 2 , F 3 are each out of phase with the others by one third of a fringe. The outputs P1, P2, P3 (Fig. 2) from the photomultipliers F1, F2, F3 respectively are combined to give three pairs of signals, each pair being 90 degrees apart in phase and each pair being separated in phase by 120 degrees from the others. The pairs of outputs e.g. A, B are squared and fed through pulse formers 12, 14, 12a, 12b, 12c, 12d, each pulse output e.g. Ap, Bp being combined both additively and subtractively with the other square waveform in the pair, i.e. Bs and As respectively, so that the direction of movement of the object may be determined. The outputs from the summation network are connected via signal level detectors to a reversible counter 17. The output from the counter may be used for automatic read out on punched tape, punched cards or magnetic tape.
GB1200166A 1966-03-18 1966-03-18 Three detector cycle counting means Expired GB1120305A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1200166A GB1120305A (en) 1966-03-18 1966-03-18 Three detector cycle counting means

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1200166A GB1120305A (en) 1966-03-18 1966-03-18 Three detector cycle counting means

Publications (1)

Publication Number Publication Date
GB1120305A true GB1120305A (en) 1968-07-17

Family

ID=9996608

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1200166A Expired GB1120305A (en) 1966-03-18 1966-03-18 Three detector cycle counting means

Country Status (1)

Country Link
GB (1) GB1120305A (en)

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