328results about "Power measurement by thermal methods" patented technology

A system and method in which an overhead high voltage transmission line sensor system is able to measure one or more of temperature, current, and line sag for a conductor within a high voltage transmission line system. The sensor system may be able to clamp to a transmission conductor or splice, harvest power from the transmission line, and / or transmit data corresponding to measurements of current, temperature, and line sag.

A sensor apparatus and sensor apparatus system for use in conjunction with a cassette, including a disposable or replaceable cassette. In some embodiments, the cassette includes a thermal well for permitting the sensing of various properties of a subject media. The thermal well includes a hollow housing of a thermally conductive material. In other embodiments, the cassette includes sensor leads for sensing of various properties of a subject media. The thermal well has an inner surface shaped so as to form a mating relationship with a sensing probe. The mating thermally couples the inner surface with a sensing probe. In some embodiments, the thermal well is located on a disposable portion and the sensing probe on a reusable portion.

The invention discloses a microwave power sensor with a multi-cantilever structure. The microwave power sensor comprises a substrate, and a micro-strip line, a cantilever anchoring region and a plurality of pressure welding blocks, which are arranged on the substrate, wherein the cantilever anchoring region and the pressure welding blocks are arranged on the two sides of the micro-strip line respectively; a plurality of cantilevers which are parallel to one another and hung in the air are arranged above the micro-strip line; the cantilevers and the micro-strip line are vertical and have different lengths; and one end of each cantilever is arranged on the cantilever anchoring region, and the other end of each cantilever are correspondingly hung above one pressure welding block. According to the microwave power sensor, the displacements of the cantilevers are caused by the attraction of the microwave power transmitted on the micro-strip line to the cantilevers of different lengths, and the measurement of the microwave power transmitted on the micro-strip line is realized by detecting the number of the cantilevers of different lengths, which are placed in parallel and contacted with the pressure welding blocks, so that the sensitivity of the power sensor can be improved, the structure can be simplified, digital output is realized, and the error range is controlled.

In embodiments of the present invention, a method and system is provided for designing improved intelligent, LED-based lighting systems. The LED based lighting systems may include fixtures with one or more of rotatable LED light bars, integrated sensors, onboard intelligence to receive signals from the LED light bars and control the LED light bars, and a mesh network connectivity to other fixtures.

The invention discloses a dual channel microwave power detection system based on a microelectronic mechanical microwave power sensor and a preparation method thereof. The system has the advantages of simple structure, large measurement range and no direct current power consumption. The system is based on a gallium arsenide substrate. A coplanar waveguide transmission line (A), a thermoelectric MEMS microwave power sensor (B) and an MEMS clamped beam capacitor type microwave power sensor (C) are designed on the substrate. When the power of a microwave signal is small, the thermoelectric MEMS microwave power sensor carries out detection according to the one-to-one corresponding relationship between the thermopile output voltage and the microwave power. When the power of the microwave signal is large, the MEMS clamped beam capacitor type microwave power sensor carries out detection. A square mass block is designed on an MEMS clamped beam above the coplanar waveguide transmission line. The area with the coplanar waveguide transmission line is increased, and at the same time the weight of the center position of the MEMS clamped beam is increased. Static power is more likely to cause large deformation of the MEMS clamped beam, and the system sensitivity is improved.

A battery pack, and more particularly, a temperature compensated current measuring device which can accurately measure an actual current flowing in a circuit of a charging / discharging path in the battery pack. The temperature compensated current measuring device includes a conductor in which current flows, a temperature sensor disposed around the conductor to measure a temperature of the conductor, and a temperature compensated current detection circuit part electrically connected to two positions of the conductor to measure a voltage between the two positions, electrically connected to the temperature sensor to measure a temperature of the conductor, and measuring the current flowing in the conductor by using the measured temperature and the voltage as an input signal. Thus, it is possible to accurately calculate an actual charging / discharging current with the temperature compensated current measuring device and effectively control the charging capacity of the battery pack.

The invention discloses an MEMS (Micro Electronic Mechanical System) cantilever beam type online microwave power sensor and a production method thereof. The microwave power sensor comprises a gallium arsenide substrate, a mainline CPW (Co-Planer Waveguide), a subline CPW, an MEMS cantilever beam type structure and a terminal microwave power monitoring system, wherein the MEMS cantilever beam type structure comprises a cantilever beam and an anchor area; the cantilever beam stretches across the mainline CPW signal line, and the fixed end of the cantilever beam is fixed on the anchor area; the anchor area is connected with the terminal microwave power monitoring system through the subline CPW signal line; and a drive electrode is arranged below the cantilever beam type structure. The MEMS cantilever beam type online microwave power sensor not only has the advantages of the terminal type microwave power sensor, such as low loss and high sensitivity, but also has the advantages of online microwave power measurement, realization of monitoring and not monitoring, integration of the online microwave power sensors with various kinds of coupling factors, and compatibility with the gallium arsenide monolithic microwave integrated circuit.

An arrangement for use in a utility meter includes a temperature sensor, a memory device, a communication circuit, and a processing circuit. The processing circuit is operably coupled to receive information representative of temperature measurements from the temperature sensor. The processing circuit is configured to store first temperature information associated with a first time period in a first data record in the memory device, the first temperature information derived from one or more of the temperature measurements. The processing circuit is further configured to store subsequent temperature information associated with corresponding subsequent time periods in corresponding other data records in the memory device. The processing circuit is also configure to periodically cause the communication circuit to communicate information representative of the first temperature information and the subsequent temperature information to an external device.

The invention discloses an MEMS (Micro Electronic Mechanical System) clamped beam type online microwave power sensor and a production method thereof. The microwave power sensor comprises a gallium arsenide substrate, a mainline CPW (Co-Planer Waveguide), a subline CPW, an MEMS clamped beam type structure and a terminal microwave power monitoring system, wherein the MEMS clamped beam type structure comprises a clamped beam and an anchor area; the clamped beam stretches across the mainline CPW signal line, and both ends of the clamped beam are fixed on the anchor area; the anchor are is connected with the terminal microwave power monitoring system through the subline CPW signal line rather than the CPW ground line; and a drive electrode is arranged below the clamped beam type structure. The MEMS clamped beam type online microwave power sensor not only has the advantages of a terminal type microwave power sensor, such as low loss and high sensitivity, but also has the advantages of online microwave power measurement, realization of monitoring and not monitoring, integration of the online microwave power sensors with various kinds of coupling factors, and compatibility with the gallium arsenide monolithic microwave integrated circuit.

A method of characterizing a circuit comprises the steps of measuring a first delay associated with the circuit when the circuit is substantially unloaded; measuring a second delay associated with the circuit when the circuit is loaded by a predetermined impedance; determining a difference between the second delay and the first delay, the delay difference corresponding to a switching impedance associated with the circuit; and determining a characterization parameter of the circuit, the characterization parameter being a function of at least the switching impedance associated with the circuit. The methodologies of the present invention are directed primarily to individually evaluating pullup and pulldown delays with substantial precision (e.g., sub-picosecond) for a representative set of circuits in the presence of an arbitrary switching history.

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 sensor comprises an optical sensor made of semiconductor material. The semiconductor material comprises an absorption edge which is sensitive to a temperature variation. The semiconductor material is for placing in thermal contact with the monitored element of the device, whereby, when the current or power varies in the monitored element, it causes a variation in temperature in the semiconductor element and hence a spectral shift of the absorption edge which can be measured and which is representative of current and power variation.

A system and methods for capturing the time and temperature at which a thermostat(s) in a home turns on and turns off, and then analyzing those times and temperatures at particular granularities to identify improvements in energy usage. These time and temperature data points are some of the information needed to determine two performance attributes in the home: the ramping time when the HVAC system is returning the home to the comfort setting (which is called herein the system on time), and the ramping time for the home to hit the next on cycle.

One embodiment disclosed relates to an apparatus for temperature control of an integrated circuit on a circuit board. The apparatus includes a first resistor on the circuit board, a second resistor on the circuit board, and a heat conductive material. The heat conductive material is attached to both the first and second resistors and to a surface of a package containing the integrated circuit. Another embodiment disclosed relates to an apparatus that provides both cooling and heating functionality in order to maintain the operational temperature of the IC within an acceptable range.

A pre-amplifier circuit for connection to an antenna of a human-portable locator includes a differential amplifier / mixer pair and means for allowing a common-mode “phantom” signal to modulate a transfer function of the differential amplifier / mixer pair. The common-mode phantom signal modulates the transfer function of the differential pre-amplifier “onboard” the antenna without the usual requirement for onboard power supply and signal oscillator. This technique uses the same electronic components to provide both pre-amplification and mixing functions, thereby improving circuit performance-to-cost ratio, reducing mixer power consumption, situating the necessary signal oscillator remotely from the mixer, and greatly improving the available system bandwidth by limiting spectral transmission demands to the mixed signal bandwidth alone.

The invention discloses a cantilever beam and direct-type power sensor based microwave detecting system and a detecting method thereof. The detecting system comprises an MEMS (micro-electromechanical system) reconfigurable antenna, an MEMS adjustable filter, a control circuit and a microwave detector, the microwave detector is manufactured on a GaAs substrate and comprises a CPW (coplanar waveguide) transmission line, four structurally identical MEMS cantilever beam structures, a power combiner and four structurally identical MEMS direct-type microwave power sensors. The cantilever beam and direct-type power sensor based microwave detecting system has the advantages of novel structure and small size, can achieve integration of microwave signal frequency and power detection, and can be compatible with a GaAs monolithic microwave integrated circuit.

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 transmission line. The sensing device acquires real-time information that is used in an iterative process to determine sag, limiting temperature, maximum current load and minimum clearance of the transmission line or conductor.

A utility meter having a temperature compensation function provides advantages such as improved time keeping accuracy. According to an exemplary embodiment, a utility meter includes at least one sensor for detecting an ambient temperature at a location corresponding to a component such as a crystal oscillator that enables a time keeping function of the meter, and generating an output signal representative of the detected ambient temperature. A device such as a digital signal processor adjusts at least one clock maintained by the time keeping function of the meter in dependence upon the output signal from the at least one sensor.

The invention provides a microcalorimeter, a power reference system utilizing the microcalorimeter and a measuring principle thereof. The microcalorimeter has an structure of an auxiliary heater, the power reference system applies current bias to the auxiliary heater of the microcalorimeter by the aid of an auxiliary heating direct-current substitute instrument so as to realize direct-current substitution measurement to a heat insulation section, and effective efficiency of a working end can be acquired by a short-circuiter and calibration tests. Affection on a thermistor mount according to the transfer standards is eliminated during computing, S parameter measurement and side-arm power monitoring are omitted, tracing patch of the radiofrequency power reference is changed, and only voltage reference can be traced. In addition, the power reference system utilizing the measuring principle will be the national radio power reference.

An improved power sensor having an input connector connected to an input port having a center pin and a ground side; an amplifier; first and second detectors; and a thermal stabilization system, including a thermal mass disposed between the ground side of the input connection and the detectors, a ground plane for holding the temperature of thermally sensitive components constant to within 2 degrees C., and a thermal impedance disposed between the center pin of the input port, preferably including a splitter and at least one DC capacitor, and a temperature sensor disposed on the ground plane.

A directory-based coherency method, system and program are provided for intervening a requested cache line from a plurality of candidate memory sources in a multiprocessor system on the basis of the sensed temperature or power dissipation value at each memory source. By providing temperature or power dissipation sensors in each of the candidate memory sources (e.g., at cores, cache memories, memory controller, etc.) that share a requested cache line, control logic may be used to determine which memory source should source the cache line by using the power sensor signals to signal only the memory source with acceptable power dissipation to provide the cache line to the requester.

A low voltage detector (100) includes a power supply voltage monitor circuit (110) that produces a voltage VSP related to a first a power supply voltage, and a voltage generator (105), which includes a plurality of self-cascode MOSFET (SCM) structures (101-103) in a cascade configuration, that generates a reference voltage Vxm. A voltage comparator (140) outputs an output signal in response to a differential between Vxm and VSP, wherein Vxm and VSP have proportional to absolute temperature behavior (PTAT) over temperature with respect to a second power supply voltage. The output signal changes state when the first power supply voltage equals a trip point of the comparator. Each SCM structure is sized to provide a rate of change with temperature of the PTAT behavior of Vxm that matches a rate of change with temperature of the PTAT behavior of VSP.

The invention relates to a system and a method for synchronously testing nanofluid heat transfer coefficient and influence rule thereof on the power generation efficiency influence rule of a thermoelectric generation system. The system mainly comprises a liquid storage tank, a peristaltic pump, a cold water bath, a copper pipe, a heat sink, a thermoelectric device, a heat source, a plurality of groups of thermocouples, a data acquirer, a computer control terminal and the like. The method comprises the following steps: measuring the temperature T1, T2 and T3 of nanofluid entering the inlet end of the cold water bath, at the distance away from the inlet end by 20-30cm and in the cold water bath, calculating the intensified convection heat transfer performance of the nanofluid according to constant-temperature boundary conditions. Heat carried by the nanofluid is estimated by distributing the thermocouples on the heat sink from top to bottom, and the thermoelectric conversation efficiency under differnet nanofluid working conditions can be obtained by combining the conversation power of the thermoelectric devices. The synchronous testing on the intensified heat transfer coefficient of nanofluid under different working conditions, and the influence of the intensified heat transfer coefficient of nanofluid under different working conditions on the cooling effect of the cold end of the thermoelectric devices as well as the influence on the conversation efficiency can be realized, the measurement errors can be decreased, and the testing accuracy can be improved.

The present invention discloses a hot-wire anemometer calibrating device in a sound filed and a calibrating method. The device comprises the following components: a closed container; a driving mechanism which is fixed and installed in the closed container; a probe which is connected with the driving mechanism and moves under the driving of the driving mechanism; a displacement transducer which is provided on the driving mechanism; a pressure sensor and a temperature sensor which are installed at the inner part of the container; and a conducting wire. The method comprises the following procedures: when the closed container is executed with vacuum pumping, filling a working medium to be tested; setting a first group of working condition point; setting a second group of working condition point; respectively collecting a hot-wire electric signal corresponding with the working condition point to the first group of working condition point and the second working condition point; respectively executing data fitting to the first group of working condition point, the second group of working condition point and the corresponding hot-wire electric signals; and fitting the two obtained data and then executing combination fitting. The calibrating to the hot-wire anemometer is more accurate and a larger speed range can be calibrated.

The invention discloses a five-port micromachine cantilever-based capacitance type microwave power sensor. The input ends of five coplanar waveguides (CPWs) for transmitting microwave signals are arranged on a gallium arsenide substrate, the CPWs are symmetrically arranged, and a 72-degree angle is formed between every two CPWs; the output end of each CPW is connected with two terminal matched resistors; each terminal resistor is provided with a thermocouple nearby; the five thermocouples are arranged at the inclined angle of 72 degrees and are connected in series with one another to form a thermopile; simultaneously, each CPW is bridged with a micro-electromechanical system (MEMS) cantilever; one end of each cantilever is positioned in a free state, and the other end of the cantilever isfixed in an anchor area; the anchor area is positioned on the outer side of a CPW ground wire; and a sensing electrode is arranged between a CPW signal wire and the ground wire. The sensor has low loss, high sensitivity and high linearity; the microwave power of five ports can be measured; simultaneously, ports into which the microwave power is input and the magnitude proportion of the power can be detected; and the sensor has the advantages of high integration level and compatibility with a gallium arsenide monolithic microwave integrated circuit.