Vibration dosimeter worn by an operator

• US 6,490,929 B1
• Filed: 07/07/1999
• Issued: 12/10/2002
• Est. Priority Date: 03/22/1995
• Status: Expired due to Fees

• Current Assignee: Lattice Intellectual Property Limited
• Original Assignee: BG Transco PLC (National Grid PLC)
• Inventors: Russell, Andrew Charles, Hobson, Simon Clive
• Primary Examiner(s): Moller, Richard A.
• Application Number:
  US08/913,715
• Time in Patent Office: 1,252 Days
• Field of Search: 735/70, 73D/IG.1, 736/58, 736/49, 735/79, 73/18.2, 73/18.5, 736/46, 736/47, 736/48, 735/93, 735/83, 736/60, 340/870.01, 340/870.3, 340/669, 340/679, 340/680, 340/683, 340/870.28
• US Class Current: 73/660
• CPC Class Codes: G01H 1/00 Measuring characteristics of vibrations in solids by using direct conduction to the detector G01H9/00, G01H11/00 take precedence
• CPC Class Codes: G01H 3/14 Measuring mean amplitude; Measuring mean power; Measuring time integral of power

Abstract

A vibration monitor is provided which is worn on the wrist of an operative for an operating plant or apparatus. The monitor includes a piezoelectric transducer and associated circuitry which generates electronic digital signals during the periods when vibrations are experienced by the operative. Preferably, the plant or apparatus has a transmitter which transmits a code identifying the plant which is received by the monitor. Alternatively, the code may be entered manually. The monitor preferably includes a logger which can be connected to a host computer which data can be transferred over an external communications link. The logger includes a storage device for storing how long the operative is subjected to vibrations.

Claims

1. A vibration monitor to be worn by an operative comprising:

means for identifying plant or equipment in use by the operative to allow a predetermined vibration level associated with that plant or equipment to be available to the monitor, said identifying means receiving an identifying code identifying the plant or equipment in use from a transmitter, including a kinetic power source, associated with the plant or equipment in use;

a piezoelectric sensor for detecting that vibration is occurring, and means for determining the elapsed time during which vibration is detected.

2. A monitor as claimed in claim 1 wherein the means for identifying equipment includes means for receiving a code indicative of the equipment to be utilized or the level of vibration to be expected.

3. A monitor according to claim 1 in which a code identifying the apparatus responsible for imposing the vibrations can be manually entered into the vibration monitor.

4. A monitor according to claim 1 in which a code identifying the apparatus responsible for imposing the vibrations is transmitted by a transmitter attached to the vibrating equipment for receipt by the vibration monitor.

5. A monitor according to claim 4 wherein the transmitter includes a kinetic power source.

6. A monitor according to claim 1 wherein storage means are provided for recording accumulated duration information and access means are provided to allow the accumulated duration information to be made available externally of the monitor.

7. A monitor as claimed in claim 6 wherein the information is made available by means of a computerized communications link.

8. A monitor according to claim 6 wherein the storage means includes means for identifying the date and time of day to accompany the accumulated duration information.

9. A monitor according to claim 1 wherein the vibration sensor is a binary device for producing a first signal when vibration is detected and a second signal when no vibration is detected.

10. A monitor as claimed in claim 1 wherein a calculator means is provided for producing an indication of total accumulated time and degree of vibration over a given period.

11. A monitor according to claim 1 wherein alarm means are provided to indicate when accumulated exposure reaches a predetermined level.

12. A method of monitoring vibration imposed by apparatus on an operative and comprising:

identifying plant or equipment in use by the operative to allow a predetermined vibration level associated with that plant or equipment to be available to a monitor by receiving an identifying code identifying the plant or equipment in use from a transmitter, including a kinetic power source, associated with the plant or equipment in use; and

sensing, using a piezoelectric sensor, whenever vibrations are occurring and determining the elapsed time during which vibrations are detected.

13. A method as claimed in claim 12 including the step of storing vibration information concerning equipment to be utilized so as to determine accumulated vibration exposure for a given time.

14. A method as claimed in claim 12 including transmitting coded information from the utilised equipment by wireless means to identify the equipment being operated.

15. A method as claimed in claim 13 wherein information from the utilized equipment is communicated to a remote computer via a communications link.

16. A plant vibration monitoring system comprising a plant identity mechanism including means, carried by a plant or equipment being used, for producing an output indicative of the plant or equipment being used and a vibration monitor adapted to worn by an operative and including identifying means for sensing said output so as to identify the corresponding plant or equipment being used so as to allow a predetermined vibration level value associated with the corresponding plant or equipment to available to the monitor;

detecting means, including a piezoelectric sensor, for detecting that vibration is occurring and for determining the elapsed time during which vibration is detected, said plant identity mechanism comprising a transmitter, including a kinetic power source, associated with the plant or equipment in use, for transmitting an identifying code identifying the plant or equipment in use.

17. A mechanism as claimed in claim 16 wherein the means includes a transmitter attached to the plant for transmitting a code indicative of the type of equipment being utilized.

18. A mechanism as claimed in claim 17 wherein the means includes a transmitter attached to the plant for transmitting information indicative of the level of vibration expected for that equipment.