초록 ▼

A system for monitoring a structure includes cavities on an outer surface and a fluid source at substantially constant pressure coupled to the cavities through high fluid impedances to create pressure differentials therebetween. A telemetry system has pressure differential switches across each of th

A system for monitoring a structure includes cavities on an outer surface and a fluid source at substantially constant pressure coupled to the cavities through high fluid impedances to create pressure differentials therebetween. A telemetry system has pressure differential switches across each of the high impedances for monitoring differential pressure changes across the impedances and providing a signal indicative of the location of the cavity associated with the high impedance across which the change is monitored. A fluid capacitance is associated with each cavity and the corresponding impedances to facilitate a transient fluid flow through the impedances. The transient flow is produced by temporarily coupling the cavities to the reference pressure and then recoupling to the source, producing transient fluid flow through the fluid capacitance and a consequential transient differential pressure sequentially across each of the high fluid impedance devices, thereby inducing sequential cyclical switching of the differential pressure switches.

대표청구항 ▼

A system for monitoring a structure includes cavities on an outer surface and a fluid source at substantially constant pressure coupled to the cavities through high fluid impedances to create pressure differentials therebetween. A telemetry system has pressure differential switches across each of th

A system for monitoring a structure includes cavities on an outer surface and a fluid source at substantially constant pressure coupled to the cavities through high fluid impedances to create pressure differentials therebetween. A telemetry system has pressure differential switches across each of the high impedances for monitoring differential pressure changes across the impedances and providing a signal indicative of the location of the cavity associated with the high impedance across which the change is monitored. A fluid capacitance is associated with each cavity and the corresponding impedances to facilitate a transient fluid flow through the impedances. The transient flow is produced by temporarily coupling the cavities to the reference pressure and then recoupling to the source, producing transient fluid flow through the fluid capacitance and a consequential transient differential pressure sequentially across each of the high fluid impedance devices, thereby inducing sequential cyclical switching of the differential pressure switches. using the stored wireless information, the remote access controller making a decision from the previously stored wireless information and without requiring additional information from the central access control system about whether to unlock the door in response to the user making the attempt to unlock the door; and wherein the remote access controller periodically initiates a wireless communication with the central access control system and the central access control system transmits user updates to the remote access controller in response to the wireless communication periodically initiated by the remote access controller. 2. The remote access control system of claim 1, wherein the remote wireless communicator includes an antenna and a receiver electrically coupled between the antenna and the access controller to communicate the wireless information received by the antenna to the remote access controller. 3. The remote access control system of claim 2, including a housing having inner portion to be mounted on an inside of a door and an outer portion to be mounted on an outside of a door; and the antenna is mounted to the outer portion of the housing and the remote wireless communicator and remote access controller are mounted to the inner portion of the housing. 4. A remote access control system adapted to be mounted to a door to control the locking and unlocking of the door and adapted to receive wireless information from a central access control system located remotely from the access control system, the remote access control system comprising: a remote wireless communicator adapted to receive wireless information from the central access control system; a remote access controller electrically coupled to the remote wireless communicator and configured to receive the information from the remote wireless communicator, the remote access controller being configured to control the locking and unlocking of the door using the information, wherein the remote wireless communicator is further adapted to transmit wireless information to the central access control system, and wherein the remote wireless communicator includes a switch for selectively choosing between receiving and transmitting the wireless information; and wherein the remote access controller periodically initiates a wireless communication with the central access control system and the central access control system transmits user updates to the remote access controller in response to the wireless communication periodically initiated by the remote access controller. 5. The remote access control system of claim 1, including a local communication port electrically coupled to the remote access controller and adapted to provide wired communication from a portal device. 6. The remote access control system of claim 1, wherein the remote wireless communicator is adapted to receive RF information. 7. The remote access control system of claim 6, wherein the remote wireless communicator is adapted to receive spread-spectrum RF information. 8. The remote access control system of claim 6, wherein the remote wireless communicator is further adapted to transmit RF information. 9. A remote access control system adapted for wireless communication with a central access control system located remotely from the remote access control system and adapted to unlock a lock upon proper presentation of a valid user data to the remote access control system, the remote access control system comprising: a reader adapted to read user data presented to the reader; a remote access controller electrically coupled to the reader, the remote access controller being configured to determine whether the user data is valid and being adapted to unlock the lock if the data is valid, the remote access controller determining whether the user data is valid by comparing the user data with previously stored wireless information received from, and without requiring additional information from the centra l access control system, such previously stored information having been transmitted to the remote access controller by the central access control system prior to the user data being presented to the reader; a remote wireless communicator electrically coupled to the remote access controller, the remote wireless communicator being adapted to communicate information wirelessly between the remote access controller and the central access control system; and wherein the remote access controller periodically initiates a wireless communication with the central access control system and the central access control system transmits user updates to the remote access controller in response to the wireless communication periodically initiated by the remote access controller. 10. The remote access control system of claim 9, wherein the remote access control system further comprises a battery coupled to the reader, the remote access controller, and the remote wireless communicator. 11. The remote access control system of claim 9, wherein the remote wireless communicator includes an antenna; including a housing having inner portion to be mounted on an inside of a door and an outer portion to be mounted on an outside of a door; and the antenna and reader are mounted to the outer portion of the housing and the remote wireless communicator and remote access controller are mounted to the inner portion of the housing. 12. A remote access control system adapted for wireless communication with a central access control system located remotely from the remote access control system and adapted to unlock a lock upon proper presentation of a valid user data to the remote access control system, the remote access control system comprising: a reader adapted to read user data when presented to the reader; a remote access controller electrically coupled to the reader, the remote access controller being configured to determine whether the user data is valid by comparing the user data with previously-stored wireless information received from, and without requiring additional information from the central access control system, such previously stored wireless information having been transmitted to the remote access controller by the control access control system prior to the user data being presented to the reader, and the remote access controller being adapted to unlock the lock if the data is valid; a remote wireless communicator electrically coupled to the remote access controller, the remote wireless communicator being adapted to communicate information wirelessly between the remote access controller and the central access control system, wherein the remote access control system further comprises a battery coupled to the reader, the remote access controller, and the remote wireless communicator, wherein the user data is on a control card; and wherein the remote access controller periodically initiates a wireless communication with the central access control system and the central access control system transmits user updates to the remote access controller in response to the wireless communication periodically initiated by the remote access controller. 13. The remote access control system of claim 9, wherein the remote wireless communicator is adapted to receive spread-spectrum wireless information from the central access control system. 14. A remote access control system adapted for wireless communication with a central access control system located remotely from the remote access control system and adapted to unlock a lock upon proper presentation of a valid user data to the remote access control system, the remote access control system comprising: a reader adapted to read user data when presented to the reader; a remote access controller electrically coupled to the reader, the remote access controller being configured to determine whether the user data is valid by comparing the user data with previously-stored wireless information received fr