SYSTEM AND METHOD FOR MEASURING ROTATIONAL SPEED OF AN OBJECT

Abstract

Disclosed are systems and methods for measuring rotational speed of an object rotating about a non-fixed axis of rotation. The system comprises a source unit capable of emitting source signal; a receiving unit capable of receiving the source signal synchronous with rate of rotation of the object; and a process and display unit communicatively coupled to the receiving unit, the process and display unit capable of determining and displaying rotational speed of the object.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The advantages and features of the present invention will become better understood with reference to the following detailed description and claims taken in conjunction with the accompanying drawings, wherein like elements are identified with like symbols, and in which:

FIG. 1 is a block diagram of a system 100 for measuring rotational speed of an object, according to an embodiment of the present invention;

FIG. 2A illustrates a modulated electromagnetic signal, according to an embodiment of the present invention;

FIG. 2B illustrates a demodulated electromagnetic signal, according to an embodiment of the present invention;

FIG. 3 illustrates the system 100 in a utilized state, according to an embodiment of the present invention;

FIG. 4 is a flowchart showing the steps involved in the functioning of the system 100, according to an embodiment of the present invention;

FIG. 5 is a block diagram of a system 500 for measuring rotational speed of an object, according to another embodiment of the present invention;

FIG. 6 illustrates system 500 in a utilized state, according to an embodiment of the present invention; and

FIG. 7 is a flowchart showing the steps involved in the functioning of the system 500, according to an embodiment of the present invention.

Like reference numerals refer to like parts throughout the description of several views of the drawings.

Claims

1. A system for measuring rotational speed of an object rotating about a non-fixed axis of rotation, comprising: a source unit capable of emitting a source signal;a receiving unit capable of receiving the source signal synchronous with rate of rotation of the object;a process and display unit communicatively coupled to the receiving unit, the process and display unit capable of determining and displaying rotational speed of the object.

2. The system of claim 1, wherein the object is a skater.

3. The system of claim 1, wherein the source signal is an infra-red signal or laser signal.

4. The system of claim 1, wherein the receiving unit comprises a detector with an inbuilt filter for correctly detecting the source signal.

5. The system of claim 1, wherein the source unit is attached to the object.

6. The system of claim 5, wherein the source signal comprises a first frequency component, and a second frequency component having lower frequency than the first frequency component.

7. The system of claim 6, wherein the receiving unit comprises a filter capable of removing the first frequency component from the source signal before the source signal is passed onto the process and display unit.

8. The system of claim 1, further comprising a reflective medium attached to the object for reflecting the source signal to the receiving unit.

9. The system of claim 8, wherein the reflective medium comprises at least one of reflective tape strip and reflective paint strip.

10. The system of claim 1, wherein the rotational speed of the object is an average rotational speed of the object in a spin interval.

11. The system of claim 10, wherein the process and display unit further determines and displays at least one of highest rotational speed in a spin interval, length of time of the spin interval, and the number of rotations during the spin interval.

12. A method for measuring rotational speed of an object rotating about a non-fixed axis of rotation, comprising: generating a source signal, the source signal having a first frequency component, and a second frequency component having lower frequency than the first frequency component;detecting the source signal synchronous with the rate of rotation of the object by verifying the presence of the first frequency component;filtering the source signal to remove the first frequency component; anddetermining a time difference between start rise/fall times for each set of two consecutive pulse groups of the second frequency component in a spin interval for measuring the rotational speed of the object.

13. The method of claim 12, wherein the source signal is generated by a source unit attached to the object.

14. The method of claim 12, wherein the source signal is infra red signal.

15. The method of claim 12, wherein the rotational speed of the object is an average rotational speed of the object in a spin interval.

16. The method of claim 12, further comprising determining at least one of highest rotational speed in a spin interval, length of time of the spin interval, and the number of rotation during the spin interval.

17. A method for measuring rotational speed of an object rotating about a non-fixed axis of rotation, comprising: generating a source signal;reflecting the source signal using a reflective medium attached to the object;detecting the reflected source signal synchronous with the rate of rotation of the object; anddetermining a time difference between start rise/fall times for each set of two consecutive pulse groups of the source signal in a spin interval for measuring the rotational speed of the object.

18. The method of claim 17, wherein the source signal is laser signal.

19. The method of claim 17, wherein the rotational speed of the object is an average rotational speed of the object in a spin interval.

20. The method of claim 17, further comprising determining at least one of highest rotational speed in a spin interval, length of time of the spin interval, and the number of rotation during the spin interval.