Measuring and controlling the thickness of a conductive coating on an optical fiber

A method for manufacturing a coated optical fiber includes depositing aconductive coating on the optical fiber and measuring a value of conductance of that coating. Featured within the manufacturing method is a method for measuring the thickness of the conductive coating on an insulator, e.g., carbon on an optical fiber, including the following steps. An electromagnetic field is established by an input signal. The conductively coated insulator is moved through the energized electromagnetic field. The conductive coating on the insulator is oriented with respect to the electric field so that their interaction increases transmission loss from input to output. An output signal is extracted from the electromagnetic field. From changes in the output signal with respect to a predetermined standard, or reference, the conductance and the thickness of the conductive coating are determined. From the measured thickness of the coating, a control signal is generated for dynamically controlling one or more of the process parameters for depositing the coating on the insulator from a precursor gas. The coated insulator continuously moves through the apparatus without any physical contact. No interruption of the production process occurs.

Radiation-resistant linbo3 and optical devices utilizing same

Method of making a carbon coated optical fiber

A process for manufacturing an optical fiber includes the steps of heating and drawing material from a hot optical fiber preform; exposing the hot optical fiber to a compound containing carbon for depositing a carbon coating on the moving opticalfiber; measuring an electrical property of the carbon coating; and in response to the measured electrical property, changing a parameter of the process for controlling a characteristic of the carbon coating on the moving optical fiber. Featured within the manufacturing method is a method for measuring the thickness of the carbon coating on the moving optical fiber. From the measured thickness of the carbon coating, a control signal is generated for changing one or more of the process parameters for depositing the carbon coating on the optical fiber from a precursor gas. The coated optical fiber continuously moves through the process without any physical contact. No interruption of the production process occurs.

Detection of arcs in power cables using plasma noise or negtive resistance of the arcs

A process for detecting arc discharges in power cables connecting power supply board and at least one equipment rack, the power supply board including circuit breakers operable at a preset current level, said arc discharge occurring at a fraction of said current level. After the arc discharge is detected, a signal representing the presence of the arc discharge is supplied to a power supply control, and a control signal is provided by the power supply control to cause said at least one circuit breaker to open interrupting supply of power to an affected power cable.

Electromagnetic resonator comprised of annular resonant bodies disposed between confinement plates

Electromagnetic resonators according to the invention comprise a first body, exemplarily a split thin ring, that is disposed between two planar field confining plates. The thickness (t) of the first body is less (typically less than 1/2 or 1/10) of the outer radius (R) of the body, and the distance between the first body and the confining plates is less than R. In preferred embodiments the first body comprises superconducting material. Resonators according to the invention can be readily assembled into relatively compact filters that are easily tunable, can have large quality factor, and offer the possibility of single mode operation. Such filters can advantageously be used in, e.g., wireless communications systems.

Measuring and controlling the thickness of a coating on an elongated blank

Method for fabricating integrated optical devices and devices formed thereby

Abstract: The disclosed invention involves the finding that the undesirable variation in the quality of integrated optical devices (IODs) produced using current fabrication procedures is due to compositional variations in, and between, the boules used in these procedures. These compositional variations result in refractive index variations which degrade device performance. The disclosed invention also involves two nondestructive, optical techniques for measuring the refractive index uniformities of the boules and substrates used in fabricating IODs.

Devices utilizing improved linbo3 holographic medium

Messung und Steuerung der Dicke einer Beschichtung auf einem langen Gegenstand.

Messung und Steuerung der Dicke einer Beschichtung auf einem langen Gegenstand.

Verfahren zur Herstellung einer mit Kohlenstoff und einem Polymer beschichteten optischen Faser.

Method for making a carbon-coated and polymer-coated optical fiber

Sampling technique using open holder

Sampling technique using open holder