GB780036A - Apparatus for measuring rotational speed - Google Patents
Apparatus for measuring rotational speedInfo
- Publication number
- GB780036A GB780036A GB2722154A GB2722154A GB780036A GB 780036 A GB780036 A GB 780036A GB 2722154 A GB2722154 A GB 2722154A GB 2722154 A GB2722154 A GB 2722154A GB 780036 A GB780036 A GB 780036A
- Authority
- GB
- United Kingdom
- Prior art keywords
- spot
- spiral
- pulse
- tube
- interval
- 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
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
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/4802—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage by using electronic circuits in general
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
780,036. Measuring rotational speed electrically. NAPIER & SON, Ltd., D. Aug. 18, 1955 [Sept. 20, 1954], No. 27221/54. Class 40 (1). Apparatus for measuring rotational speed of a shaft comprises an electromagnetic means associated therewith producing signals in phase quadrature which are fed through an amplifier to the X and Y plates of a cathode-ray tube causing the spot to move about an axis at the angular speed of the shaft. A control apparatus is arranged periodically to initiate a cycle com. prising switching in at a predetermined point in the travel of the spot a timing circuit to illuminate the spot for a fixed time interval and to inject a signal into the amplifier causing the spot to move radially outwards during the interval, whereby the length of spiral trace thus produced is a measure of speed. In addition the control apparatus may be arranged to make the interval short, e.g. equivalent to 1 turn of spiral and to illuminate the spot again momentarily after a total time interval of say 10 turns of spiral. The length of spiral gives a rough indication of speed while the position of the momentarily illuminated spot allows an accurate measure of the position of the end of the spiral. For instance, in Fig. 2 the two intervals are in the ratio 10: 1 so that the angular displace of spot J3 from 0 corresponds to 10 times the angular displacement of J1 from line 1 which is not readily measured directly. At a predetermined position of the shaft simultaneous pulses are applied to illuminate the tube and start a timer consisting e.g. of a crystal-controlled oscillator feeding pulse counters adapted to apply a switching-off pulse to the tube when a certain count is reached and to apply a flashing pulse to the tube after a longer interval. This pulse also resets the counter and switching circuits. The screen persistence and the periodicity of the cycle are such that a persistent trace is obtained.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2722154A GB780036A (en) | 1954-09-20 | 1954-09-20 | Apparatus for measuring rotational speed |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2722154A GB780036A (en) | 1954-09-20 | 1954-09-20 | Apparatus for measuring rotational speed |
Publications (1)
Publication Number | Publication Date |
---|---|
GB780036A true GB780036A (en) | 1957-07-31 |
Family
ID=10256111
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2722154A Expired GB780036A (en) | 1954-09-20 | 1954-09-20 | Apparatus for measuring rotational speed |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB780036A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4001689A (en) * | 1974-07-08 | 1977-01-04 | British Nuclear Fuels Limited | Device for indicating the direction of rotation of a body driven by a rotating electrical machine |
-
1954
- 1954-09-20 GB GB2722154A patent/GB780036A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4001689A (en) * | 1974-07-08 | 1977-01-04 | British Nuclear Fuels Limited | Device for indicating the direction of rotation of a body driven by a rotating electrical machine |
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