Abstract: A method of detecting a fault in a power distribution system includes placing a signal on the system at a frequency F1 and then detecting a change in the signal due to a change in the impedence of the system as a result of a fault wherein the change is one of a change in phase, a change in signal tone, or a change in voltage level at the load. In one embodiment, band reject filters can be used to diminish the signal at the load or source. In another embodiment, the power source can be a periodic pulsed power source and the signal can be placed on the system during an idle phase of the periodic pulsed power.

Abstract: A method and system for allowing multiple geographically distributed optical labs to share global resources over a telecommunications network. Each optical lab is set up as a client account on the server with privileges to access the global recourses. Each lab has its own equipment set, the settings and configuration of which, are recorded in one of the client account databases. Other proprietary databases contain price lists, financial information and patient data. The lens calculation software encounters a sequential stream of job requests from different client accounts. The corresponding proprietary account data, allows uniform pricing rules to be applied to lens processing jobs. As jobs are completed, each lab receives an individual packet of printable job ticket data, printable invoice data, electronic interface files for the lens generating equipment, and an extract file for importing into the labs accounting software.

Abstract: A method and system for allowing multiple geographically distributed optical labs to share global resources over a telecommunications network. Each optical lab is set up as a client account on the server with privileges to access the global recourses. Each lab has its own equipment set, the settings and configuration of which, are recorded in one of the client account databases. Other proprietary databases contain price lists, financial information and patient data. The lens calculation software encounters a sequential stream of job requests from different client accounts. The corresponding proprietary account data, allows uniform pricing rules to be applied to lens processing jobs. As jobs are completed, each lab receives an individual packet of printable job ticket data, printable invoice data, electronic interface files for the lens generating equipment, and an extract file for importing into the labs accounting software.