FR2416474A1 - Tachometer measuring velocity of ball struck by sportsman - has acoustic sensor at start point and net tension detector at finish point to control calculator - Google Patents

Tachometer measuring velocity of ball struck by sportsman - has acoustic sensor at start point and net tension detector at finish point to control calculator

Info

Publication number
FR2416474A1
FR2416474A1 FR7803001A FR7803001A FR2416474A1 FR 2416474 A1 FR2416474 A1 FR 2416474A1 FR 7803001 A FR7803001 A FR 7803001A FR 7803001 A FR7803001 A FR 7803001A FR 2416474 A1 FR2416474 A1 FR 2416474A1
Authority
FR
France
Prior art keywords
point
sportsman
acoustic sensor
calculator
ball
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
FR7803001A
Other languages
French (fr)
Other versions
FR2416474B1 (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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to FR7803001A priority Critical patent/FR2416474A1/en
Publication of FR2416474A1 publication Critical patent/FR2416474A1/en
Application granted granted Critical
Publication of FR2416474B1 publication Critical patent/FR2416474B1/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/64—Devices characterised by the determination of the time taken to traverse a fixed distance
    • G01P3/66—Devices characterised by the determination of the time taken to traverse a fixed distance using electric or magnetic means

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

The numerical tachometer indicates average velocity of ball struck or thrown by a sportsman. This is performed by sensors at start and finish points of trajectory. An acoustic sensor (1) is located near the point where the ball starts moving. Noise is amplified and wave shaped to control a relay (16) to start counter in a calculator (3). The distance (D) from arrival point is programmed into the calculator. A second sensor comprises a net (4) between two posts (5, 6) to which intermediate posts are connected by cables (12, 13). These are attached to the posts by sensors measuring tension variations. Elongation of the net controls the relay to stop the counter. The calculator then determined the ball velocity.
FR7803001A 1978-02-03 1978-02-03 Tachometer measuring velocity of ball struck by sportsman - has acoustic sensor at start point and net tension detector at finish point to control calculator Granted FR2416474A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7803001A FR2416474A1 (en) 1978-02-03 1978-02-03 Tachometer measuring velocity of ball struck by sportsman - has acoustic sensor at start point and net tension detector at finish point to control calculator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7803001A FR2416474A1 (en) 1978-02-03 1978-02-03 Tachometer measuring velocity of ball struck by sportsman - has acoustic sensor at start point and net tension detector at finish point to control calculator

Publications (2)

Publication Number Publication Date
FR2416474A1 true FR2416474A1 (en) 1979-08-31
FR2416474B1 FR2416474B1 (en) 1980-08-29

Family

ID=9204172

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7803001A Granted FR2416474A1 (en) 1978-02-03 1978-02-03 Tachometer measuring velocity of ball struck by sportsman - has acoustic sensor at start point and net tension detector at finish point to control calculator

Country Status (1)

Country Link
FR (1) FR2416474A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1994706A (en) * 1930-09-18 1935-03-19 Hincks Drennan Golf ball speed registering device
US2102166A (en) * 1933-02-25 1937-12-14 Rca Corp Velocity measuring device
FR2036353A5 (en) * 1969-03-13 1970-12-24 Laporte Pierre
US3968434A (en) * 1974-07-19 1976-07-06 Reliance Electric Company Digital tachometer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1994706A (en) * 1930-09-18 1935-03-19 Hincks Drennan Golf ball speed registering device
US2102166A (en) * 1933-02-25 1937-12-14 Rca Corp Velocity measuring device
FR2036353A5 (en) * 1969-03-13 1970-12-24 Laporte Pierre
US3968434A (en) * 1974-07-19 1976-07-06 Reliance Electric Company Digital tachometer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NV8127/70 *

Also Published As

Publication number Publication date
FR2416474B1 (en) 1980-08-29

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Legal Events

Date Code Title Description
ST Notification of lapse