Patent JPS5830254A successfully refreshed from Google Patents.
US3824463A
Expired / Lapsed
US
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Inductance type velocity measuring apparatus
Assignee: OEHLER RES Inc
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Filing: 1972-06-23
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Granted: 1974-07-16
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Expires: 1992-06-23
Abstract
Abstract A shot cluster velocity measuring apparatus in which the coils through which the shot is to sequentially pass are mounted in axially spaced relation and are electrically connected as frequency determining elements in a high frequency oscillator, the output of which is frequency modulated as the shot cluster passes the coils. An FM discriminator generates an amplitude varying signal representative of the frequency modulation. A differentiating and filtering circuit shapes the discriminator output which is then amplified. The gain of a variable gain amplifier is automatically adjusted to equalize signal amplitude, and a Schmitt trigger produces rectangular pulses. If the pulses out of the trigger are of sufficient duration they are used to produce ''''start'''' and ''''stop'''' signals, indicating the passage of the center of mass of the projectile or projectile cluster through the first and second coils, respectively. These signals are then used to control an interval timer which displays the count as a measure of velocity.
Inventors
- 👤 K Oehler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:50
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/64; G01P3/66; G01P3/665
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
204 words
In an apparatus for measuring elapsed time of travel of a projectile between two spaced points, the appAratus being of the type having first and second reactive elements located at the spaced points, and wherein the projectile constitutes a cluster of a plurality of pellets having a characteristic shape at said second point different from its shape at said first point, the improvement comprising an oscillator; circuit means for connecting the reactive elements to said oscillator as frequency determining elements thereof; discriminator circuit means coupled to said oscillator for producing varying electrical signals representative of variations in frequency of said oscillator as a result of the passage of the projectile by the reactive elements; means coupled to said discriminator circuit means for producing first and second substantially rectangular impulses representative of the signal variations; means for amplifying the signal output of said discriminator circuit means; means for changing the gain of said means for amplifying between the amplification of the signal resulting from the passage of the projectile by the first reactive element and the signal resulting from the passage of the projectile by the second element; and means for measuring the elapsed time between the occurrence of selected points on said rectangular impulses.
Claim 2
Dependent Claim
204 words
In an apparatus for measuring elapsed time of travel of a projectile between two spaced points, the appAratus being of the type having first and second reactive elements located at the spaced points, and wherein the projectile constitutes a cluster of a plurality of pellets having a characteristic shape at said second point different from its shape at said first point, the improvement comprising an oscillator; circuit means for connecting the reactive elements to said oscillator as frequency determining elements thereof; discriminator circuit means coupled to said oscillator for producing varying electrical signals representative of variations in frequency of said oscillator as a result of the passage of the projectile by the reactive elements; means coupled to said discriminator circuit means for producing first and second substantially rectangular impulses representative of the signal variations; means for amplifying the signal output of said discriminator circuit means; means for changing the gain of said means for amplifying between the amplification of the signal resulting from the passage of the projectile by the first reactive element and the signal resulting from the passage of the projectile by the second element; and means for measuring the elapsed time between the occurrence of selected points on said rectangular impulses.
Claim 3
Independent Claim
196 words
An apparatus for measuring the time interval occupied by a projectile in travelling a known distance along a line between two points comprising the combination of first and second inductive coils mounted at said two points surrounding the line; circuit means for connecting said coils as frequency determining elements of said oscillator so that the passage of the projectile through a coil causes the frequency of the oscillator to temporarily change; frequency disciminator means connected to the output of said oscillator for producing a signal representative of the time at which the projectile passed through each coil; filter circuit means for emphasizing a selected characteristic of the signals produced by said discriminator means; means for amplifying the filtered signals by different amplification factors; trigger circuit means for producing a rectangular output pulse in response to each amplified signal; circuit means for producing a brief impulse representative of the trailing edge of each rectangular pulse having a pulse duration in excess of a predetermined time; means responsive to the first said impulse for producing a control signal to change the amplification factor of said means for amplifying; and means for measuring the time interval between said impulses.
Claim 4
Independent Claim
196 words
An apparatus for measuring the time interval occupied by a projectile in travelling a known distance along a line between two points comprising the combination of first and second inductive coils mounted at said two points surrounding the line; circuit means for connecting said coils as frequency determining elements of said oscillator so that the passage of the projectile through a coil causes the frequency of the oscillator to temporarily change; frequency disciminator means connected to the output of said oscillator for producing a signal representative of the time at which the projectile passed through each coil; filter circuit means for emphasizing a selected characteristic of the signals produced by said discriminator means; means for amplifying the filtered signals by different amplification factors; trigger circuit means for producing a rectangular output pulse in response to each amplified signal; circuit means for producing a brief impulse representative of the trailing edge of each rectangular pulse having a pulse duration in excess of a predetermined time; means responsive to the first said impulse for producing a control signal to change the amplification factor of said means for amplifying; and means for measuring the time interval between said impulses.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |