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US4155647A Expired / Lapsed US ⏱️ 0.0 years remaining

Optical apparatus for ballistic measurements

Assignee: Dr Johannes Heidenhain GmbH
•
Filing: 1977-02-24
•
Granted: 1979-05-22
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Expires: 1997-02-24
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Abstract

Abstract An optical apparatus, particularly suited for use in a ballistic measurement device, including a laser generating a laser beam, an optical means for expanding the laser beam in a plane, and an optical element, positioned between the laser and the optical means, for dividing the laser beam into a plurality of beams of substantially identical intensity so that a substantially uniform brightness results over the entire angle of divergence of the laser beam. According to another embodiment, the optical apparatus is used in a photoelectric apparatus for ballistic measurement, such as velocity of moving projectiles, further including means for deflecting the expanded laser beam to produce a second laser beam parallel to and spaced from the expanded laser beam by a predetermined distance, a photoelectric converter positioned so that the second laser beam impinges upon the converter, and an evaluation circuit responsive to an output of the converter to measure the time delay between interruptions of the first and second laser beams by a moving projectile.

Inventors

  • 👤 Dieter Michel

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 16:57
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/09; G02B27/0938; G02B27/095; G02B27/0972; G01; G01P; G01P3/00; G01P3/36; G01P3/366; G01P3/64; G01P3/68; G02B19/00; G02B19/0004; G02B19/0009; G02B19/0014; G02B19/0033; G02B19/0047; G02B27/0927; G02B27/0944; H; H01; H01S; H01S3/00; H01S3/005

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 153 words
An optical apparatus for ballistic measurements, comprising: a laser adapted to generate a laser beam; first optical means for expanding the incoming laser light to produce a first relatively thin flared light beam; second optical means, positioned between the laser and the first optical means, for dividing the laser beam into a plurality of beams of substantially identical intensity; means for deflecting the first relatively thin flared light beam to produce a second relatively thin flared light beam parallel to and spaced from the first light beam; a photoelectric converter positioned so that the second relatively thin flared light beam impinges upon the converter to produce an output; and means for evaluating the output of the photoelectric converter, including an amplifier for receiving and amplifying the output, means for transforming the amplified output into rectangular pulses, and an electronic counter, responsive to the pulses, whereby the time delay between the pulses is measured.
Claim 2
Dependent Claim 153 words
An optical apparatus for ballistic measurements, comprising: a laser adapted to generate a laser beam; first optical means for expanding the incoming laser light to produce a first relatively thin flared light beam; second optical means, positioned between the laser and the first optical means, for dividing the laser beam into a plurality of beams of substantially identical intensity; means for deflecting the first relatively thin flared light beam to produce a second relatively thin flared light beam parallel to and spaced from the first light beam; a photoelectric converter positioned so that the second relatively thin flared light beam impinges upon the converter to produce an output; and means for evaluating the output of the photoelectric converter, including an amplifier for receiving and amplifying the output, means for transforming the amplified output into rectangular pulses, and an electronic counter, responsive to the pulses, whereby the time delay between the pulses is measured.
Claim 3
Dependent Claim 17 words
The optical apparatus of claim 1 wherein the first optical means includes a pair of cylindrical lenses.
Claim 4
Dependent Claim 15 words
The optical apparatus of claim 1 wherein the second optical means includes a diffraction grating.
Claim 5
Dependent Claim 16 words
The optical apparatus of claim 1 wherein the second optical means includes a double refraction prism.
Claim 6
Dependent Claim 15 words
The optical apparatus of claim 4 wherein the double refraction prism is a Wollaston prism.
Claim 7
Dependent Claim 18 words
The optical apparatus of claim 1 wherein the second optical means includes a plurality of geometrically dividing elements.
Claim 8
Dependent Claim 14 words
The optical apparatus of claim 6 wherein the geometrically dividing elements are divider prisms.
Claim 9
Dependent Claim 14 words
The optical apparatus of claim 6 wherein the geometrically dividing elements are divider plates.

References Cited (Backward Citations)

US2769492A Cited
US3495893A Cited
US3524354A Cited
US3695749A Cited
US3675030A Cited
US3989378A Cited
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US3865487A Cited
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FR2259371A1 Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1982-05-21 1982-11-20 1983-05-22 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1986-05-21 1986-11-20 1987-05-22 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1990-05-21 1990-11-20 1991-05-22 $7700.00 Window Closed / Lapsed

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