Sensor device to monitor deformation in structural members, such as solid structures
A sensor device comprises a sensing component adapted to be connected to a monitoring system to send signals associated with deformation of a structural member. An adhesive is adapted to bond the sensing component to a surface of a structural member. A tape has at least one adhesive surface adapted to be adhered to the surface of a structural member to be monitored, with the sensing component being positioned between the tape and the surface of the structural member. The sensor device is used in combination with a monitoring system.
1. A sensor device comprising:
a sensing component adapted to be connected to a monitoring system to send signals associated with deformation of a structural member, the sensor component being at least one strain gage adapted to be bonded to a surface of the structural member;
a double-sided tape having a first adhesive surface adapted to be adhered to the surface of the structural member to be monitored, with the at least one strain gage being positioned between the tape and the surface of the structural member, and a second adhesive surface adapted to adherently support components associated with the sensing component; and
a backing sheet temporarily connected to the first adhesive surface to protect the first adhesive surface and the at least one strain gage, the at least one strain gauge being between the backing sheet and the first adhesive surface whereby the at least one strain gauge is exposed when the backing sheet is removed from the first adhesive surface.
2. The sensor device according to claim 1 , wherein the at least one strain gage has a conductive surface against the tape.
3. The sensor device according to claim 1 , wherein a structural component is adhered to the second one of the adhesive surfaces so as to support components associated with the sensing component for interface with a monitoring system.
4. The sensor device according to claim 1 , wherein a structural component connected to the tape so as to support components associated with the sensing components for interface with the monitoring system.
5. The sensor device according to claim 4 , wherein the structural component is a casing accommodating the components associated with the sensing components for interface with the monitoring system.
6. The sensor device according to claim 5 , wherein the casing has a rounded geometry, such that the sensor device is adapted to be mounted against a rounded surface of the structural member.
7. The sensor device according to claim 5 , wherein the casing has a standard wall-mount telephone jack associated with the sensing component so as to be adapted to receive a telephone plug from the monitoring system, and the tape has two said adhesive surface, with a first one of the adhesive surface adapted to adhere to the surface of the structural member, and a second one of the adhesive surfaces adapted to adherently support the standard wall-mount telephone jack.
8. The sensor device according to claim 1 , wherein the sensing component is at least one foil strain gage.
9. The sensor device according to claim 4 , further comprising an interface component on the structural component, the interface component being connected to the sensing components for interface with the monitoring system.
10. The sensor device according to claim 4 , further comprising holes in register in the structural component and the tape for lead wires of the sensing component to pass therethrough.
11. The sensor device according to claim 4 , wherein the structural component supports a built-on reservoir dispensing said adhesive.
12. The sensor device according to claim 4 , wherein the structural component supports a grinding surface to clean the surface of the structural member.
13. A sensor device and monitoring system combination comprising:
at least one sensor device having according to claim 1 ; and
a monitoring system connected to the sensor device to receive signals associated with a deformation of the structural member, the monitoring system comprising a signal interpreter to produce a value associated to said deformation, and an interface to produce a user output with said value.
14. The combination according to claim 13 , wherein the interface is a display unit displaying a numerical value as said user output associated to said deformation.
15. The combination according to claim 13 , wherein the interface is an alarm indicating that said value is above a given threshold.
16. The combination according to claim 13 , wherein the sensor device further comprises a transmitter and the monitoring system comprises a receiver for wireless communication between the sensor device and the transmitter.
17. The combination according to claim 13 , further comprising two of said sensor device for one said monitoring system.
18. The combination according to claim 13 , further comprising a limit switch connected to the monitoring system, the limit switch being triggered to activate a threshold, with the signal interpreter comparing the threshold to said value associated to said deformation.
19. The combination according to claim 13 , wherein the at least one strain gage is a foil strain gage, and a side of the strain gage from which lead wires project is against the adhesive surface of the tape.