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8797172 Transmitter with battery status indicator  
A battery powered transmitter is provided with a battery status circuit that determines an output voltage level associated with the battery. The battery status circuit is provided with multiple...
8547240 Transmitter with battery status indicator  
A battery powered transmitter is provided with a battery status circuit that determines an output voltage level associated with the battery. The battery status circuit is provided with multiple...
7759633 Optical sensor for monitoring electrical current or power  
The present invention provides an optical sensor for monitoring current or power in a monitored element of a device such as a bridge-wire or hot-wire of electro-explosive devices. The optical...
7504819 Dynamic line rating system with real-time tracking of conductor creep to establish the maximum allowable conductor loading as limited by clearance  
Maximum transmission line or conductor loading of an overhead transmission line or conductor spanning two transmission line towers is determined by using a sensing device clamped to the overhead...
7298957 Method for controlling sagging of a power transmission cable  
A method is provided for controlling the sagging of a power transmission cable hang between two towers. The cable has a first supporting portion and a second conductive portion. The method...
7039535 Apparatus and method for analysis of electric power transmission link status having function of real-time evaluating thermal parameters outside the link  
Apparatus and method for real-time analysis of an electric power transmission link status direct buried or installed in a duct or a tunnel are described. The method includes: real-time measuring a...
6992474 Movement actuator/sensor systems  
A feedback control system, comprising a flexible rod that may have an anchored end and a free end, the rod free end movable upon the application of electric potential to the rod, a current source...
6933715 Sensor system for sensing movement  
A system for sensing movement comprising an elongate object having a restrained end and an unrestrained end which is free to move in at least two degrees of freedom in response to an applied...
6767129 Microwave power sensor and method for manufacturing the same  
A microwave power sensor and a method for manufacturing the same. The microwave power sensor includes a semiconductor substrate with a nitride or oxide film formed thereon. A membrane which is a...
6759839 Wide-band RF signal power detecting element and power detecting device using the same  
A wide-band RF signal power detecting element includes, on an insulating substrate (21), at least one thin-film resistor (22a) for absorbing the power of a signal to be measured and generating...
6724194 Cell voltage monitor for a fuel cell stack  
Voltage reversal in fuel cell stacks may be detected and/or prevented by monitoring each cell or small groups of cells in the stack for low voltage conditions. An improved cell voltage monitor is...
6639395 Current sensor with input/output isolation  
A current sensor and a method for measuring currents on an integrated circuit in an isolated manner. The current sensor uses a Peltier device as a thermal difference generator to generate a first...
6441603 Overhead line rating monitor  
A method and apparatus for determining the thermal capacity of overhead power lines is disclosed. The apparatus includes two rods of similar diameter and material properties to the line to be...
6167525 Method and system for analysis of electric power transmission link status  
A method and system for transporting electric power in a link and for the analysis of the status of an electric power transmission link and the relevant current rating capability control. The...
6147481 Termination for RF circuit which senses changes in power and which is not temperature sensitive  
A circuit for determining power changes in an RF circuit includes first and second temperature sensitive resistors connected in parallel with an RF input terminal so as to have a common junction...
6121766 Current sensor assemblies  
A current sensor assembly of planar form arranged for connection in series with an electrical circuit. The circuit includes a first and second conductor. The sensor assembly includes a first...
6118268 Thermoelectric measuring device  
A thermoelectric measurement converter is disclosed, which forms the output signal as the product of the instantaneous values of two input signals; wherein the measurement converter comprises at...
5933002 Controlled bending actuator system  
Controlled bending movement of a flexible elongate rod or filament in response to a bend signal indicative of a desired amount of bending is effected by a strip of shape-changing material disposed...
5825174 Temperature responsive battery tester  
A device for measuring the voltage of a voltage source includes a number of temperature responsive displays and a circuit including a number of heating circuits, each heating circuit for heating...
5783805 Electrothermal conversion elements, apparatus and methods for use in comparing, calibrating and measuring electrical signals  
Electrothermal conversion elements, apparatus and methods for use in comparing, calibrating and measuring electrical signals utilizing a thin film heater on a thin, low mass, low thermal...
5663638 Calorimetric RF power meter with dynamic zeroing and constant temperature and power dissipation in the calorimetric bridge  
The effects of differential heating inside the calorimetric bridge are reduced by first heating the bridge externally and controlling the resulting temperature. The bridge is also heated...
5559430 Net radiation sensor  
A system for determining the sag of an overhead power transmission line to prevent flashover to adjacent objects on earth. A small replica of the transmission line conductor is provided and...
5517864 Power transmission line tension monitoring system  
A system for determining the sag of an overhead power transmission line to prevent flashover to adjacent objects on earth. Power line tension is measured as well as ambient temperature at two...
5451866 Quick-mount measuring device for evaluating the electrical characteristics of ferroelectric materials  
A device for measuring the electrical characteristics of a ferromagnetic erial as a function of temperature, such as its dielectric constant verses temperature characteristics. The device having a...
5376880 Method and apparatus for measuring the average power in an electric signal  
An apparatus is disclosed which accurately measures, over a wide ambient temperature range, the average power derived from an electrical signal. Furthermore, embodiments of the present invention...
5370458 Monolithic microwave power sensor  
A monolithic integrated circuit power sensor provides a monolithic integrated circuit substrate a conversion element formed either on or in the substrate for converting microwave energy into heat,...
5341088 System for rating electric power transmission lines and equipment  
A system for determining the current carrying capability of one or more overhead power transmission lines monitors one or more spans of each line on real-time basis and identifies the span having...
5302024 Monolithic microwave power sensor using a heat sensing diode junction  
A monolithic integrated circuit power sensor provides a monolithic integrated circuit substrate, a conversion element formed either on or in the substrate for converting microwave energy into...
5291073 Thermal power sensor  
A thermal power sensor for providing an output signal that is linearly related to the amount of power derived from a power source over a first range and that is square law related to the amount of...
5231356 Flexible battery tester with a variable length resistive heater  
A thermo-responsive device for testing dc voltage sources, particularly small, low voltage dry cells, employs a very thin resistive heater film deposited onto a thin flexible dielectric substrate....
5189362 High frequency signal measurement circuits utilizing temperature-sensitive devices  
A circuit for measuring the R.M.S. voltage of a high frequency signal (e.g. 100MHz) comprises two series-connected ntc thermistors (TH1, TH2) in a bridge circuit which is energized by a current...
5128616 DC voltage tester having parallel connected resistive elements in thermal contact with a thermochronic material  
A DC voltage tester having a plurality of resistive elements in thermal contact with a thermochromic material wherein the resistive elements are connected in a parallel configuration.
5021731 Thermo-optical current sensor and thermo-optical current sensing systems  
A thermo-optical current sensor includes a resistive or semiconducting sensing element that has an optical property that varies as a function of temperature. Current to be measured flows through...
5015943 High power, high sensitivity microwave calorimeter  
A microwave calorimeter is disclosed for substantially measuring the total icrowave energy in an applied microwave pulse. The microwave calorimeter includes: a housing having a highly reflective...
4977366 High frequency power sensing device  
The present invention relates to devices utilized for measurement of high frequency and microwave power. More specifically, the present invention relates to apparatus and technique for measurement...
4968150 Process and arrangement for measuring the energy of a microwave pulse  
In an arrangement for measuring the energy of a microwave pulse a container (2) is placed on the end of a waveguide (1). In container (2) there is an absorption liquid (3) with a given heat...
4916386 Microwave wattage indicator  
A microwave oven wattage detector having a visually and microwave transparent container holding a thermally homogeneous fluid having a wattage-indicating strip contained in the fluid with a...
4901006 Method and apparatus for AC signal comparison, calibration and measurement  
A method and apparatus for the comparision of AC signals by electrothermal means in which both signals are applied to an electrothermal converter, such as a thermocouple converter or a...
4812749 Bimetallic indicator  
A bimetallic indicator includes a bimetal being deformed by heat generated by an electric current supplied to a heat coil wound around the bimetal, a pointer moved in relation to the deformation...
4789823 Power sensor for RF power measurements  
In a power sensor for RF power measurments, comprising a thin-film absorbing resistor formed on the top surface of a support member and a thermocouple which is electrically isolated from the...
4786859 RMS measuring apparatus for AC/DC voltages  
A true RMS instrument using a multijunction thermal converter with two beaters automatically determines and displays the RMS value of an unknown voltage using two steps or modes. In an AC mode,...
4733170 Microwave power sensors  
A microwave power sensor utilizing a semiconductor power absorption element which is mounted on a fin-line structure within a waveguide channel. In order to check calibration of the sensor, a...
4695793 Resistive sensing thermal device for current measurement  
A thermal transfer device for use in the measurement of alternating current comprising an evacuated enclosure containing a first electrical conductor heated by the alternating current being...
4629978 Dipole antenna  
An antenna comprising orthogonal arrays of resistive thermocouple dipoles interconnected by transversely extending conductive elements of discrete length. The components are designed to create an...
4628256 Thermocouple power meter  
An improved meter for measuring RF power. The RF power is applied to thermocouple means which transforms the RF power into a low level d.c. signal which then passes through a chopper stage that is...
4628257 Wattmeter  
A differential thermal wattmeter of the type disclosed in U.S. Pat. No. 4,045,734 is modified to remove undesirable in-phase a.c. ripple at the fundamental frequency in the feedback path. This...
4611166 Radiation hazard detector  
An electromagnetic field detector adapted to display potential hazard to humans and other animals arising from illuminating electromagnetic energy over the frequency range determined to be...
4584523 Measurement of the current flow in an electric power transmission line by detection of infrared radiation therefrom  
Passage of current through a power transmission line causes infrared radiation therefrom. The construction of a high-tension (HT) line with counterwound helical conductors for current around a...
4553092 Apparatus and method for temperature estimation of overhead conductors  
An overhead conductor monitoring device includes a simulation conductor designed to have thermal characteristics similar to those of the overhead conductor. The simulation conductor is placed in...
4530044 Self-balancing DC-substitution measuring system  
A self-balancing DC-substitution measuring system includes a temperature dependant resistor (TDR) which is placed in one leg of a Wheatstone Bridge circuit, diagonally opposed first and second...
Matches 1 - 50 out of 209 1 2 3 4 5 >