In a method for tuning at least one parameter of a noise cancellation enabled audio system with an ear mountable playback device (HP) comprising a speaker (SP) and a feed forward microphone (FF_MIC) the playback device (HP) is placed onto a measurement fixture (MF), the speaker (SP) facing a test microphone (ECM) located within an ear canal representation (EC). The parameter is varied between a plurality of settings while a test sound is played. A measurement signal from the test microphone (ECM) is received and stored in the audio system at least while the parameter is varied. A power minimum in the stored measurement signal and a tune parameter associated with the power minimum are determined in the audio system from the plurality of settings of the varied parameter.
G10K 11/178 - Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
A method for tuning filter parameters of a noise cancellation enabled audio system with an ear-mountable playback device (HP, MP) comprising a speaker (SP) and a feedback noise microphone (FB_MIC) located in proximity to the speaker comprises provision of acoustic transfer functions between the speaker and the feedback noise microphone, between the speaker and an eardrum, between an ambient sound source and the eardrum and between the ambient sound source and the feedback noise microphone. The parameters of a feedback filter function (B),which is designed to process a feedback noise signal,are tuned. A noise cancellation performance of the audio system at the eardrum is determined based on each of the acoustic transfer functions and on the feedback filter function.
Gas sensor comprising a catalyst material; a temperature detector configured to measure a change in temperature of the catalyst material; and a plurality of electrodes configured to measure the current and/or resistance of the catalytic material wherein the gas sensor is configured such that the temperature detector provides the calorimetric output and the plurality of electrodes provide the resistive or capacitive output..
G01N 27/16 - Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature caused by burning or catalytic oxidation of surrounding material to be tested, e.g. of gas
G01N 27/12 - Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon reaction with a fluid
4.
TEMPERATURE SENSOR SEMICONDUCTOR DEVICE WITH PAIR OF DIODES AND FEEDBACK LOOP
1211ptat2ctat22), which implements a DAC and converts the CTAT voltage into a proportional current. The generator for the CTAT voltage is connected to the array of current sources to define a nominal current.
G01K 7/01 - Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat using semiconducting elements having PN junctions
G06K 19/07 - Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards with integrated circuit chips
H03M 1/14 - Conversion in steps with each step involving the same or a different conversion means and delivering more than one bit
H03M 1/06 - Continuously compensating for, or preventing, undesired influence of physical parameters
H03M 1/08 - Continuously compensating for, or preventing, undesired influence of physical parameters of noise
H03M 1/46 - Analogue value compared with reference values sequentially only, e.g. successive approximation type with digital/analogue converter for supplying reference values to converter
5.
SENSOR ARRANGEMENT AND METHOD OF OPERATING A SENSOR ARRANGEMENT
A sensor arrangement (10) comprises a pressure sensor (12) that is realized as capacitive pressure sensor, a capacitance-to-digital converter (13) coupled to the pressure sensor(12) and implemented as a delta-sigma analog-to- digital converter, and a reference voltage generator (32) having a control input for receiving a control signal (SC) and an output (33) for providing a reference voltage (VREF). The output (33) of the reference voltage generator (32) is connected to an input of the capacitance-to-digital converter (13). The reference voltage generator (32) is configured to set a value of the reference voltage (VREF) as a function of the control signal (SC). At least two different values of the reference voltage (VREF) have the same sign and different amounts.
G01L 9/00 - Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
H03M 3/00 - Conversion of analogue values to or from differential modulation
G01L 9/12 - Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in capacitance
G01L 27/00 - Testing or calibrating of apparatus for measuring fluid pressure
G01L 1/14 - Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators
A sensor arrangement(10) comprises a pressure sensor (12) that is realized as a capacitive pressure sensor, a capacitance-to-digital converter (13), a test circuit (14) and a switching circuit (15) that couples the capacitance-to- digital converter (13) and the test circuit (14) to the pressure sensor (12).
G01L 9/00 - Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
G01L 27/00 - Testing or calibrating of apparatus for measuring fluid pressure
7.
CAPACITIVE SENSOR HAVING TEMPERATURE STABLE OUTPUT
An example system includes a sensor. The sensor includes a base having a base electrode, and a first membrane suspended above the base. The first membrane includes a first membrane electrode. The first membrane is configured to deflect with respect to the base electrode in response to an environmental condition. The sensor is operable to measure a capacitance between the base electrode and the first membrane electrode. The system also includes a first electrically conductive shield layer positioned between the sensor and a device of the system operable to generate electrical interference signals. The first electrically conductive shield layer defines a plurality of first apertures extending through the first electrically conductive shield layer. The system also includes dielectric material disposed in the plurality of first apertures.
G01L 9/12 - Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in capacitance
G01L 9/00 - Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
A circuit for measuring an unknown resistance of a resistive element comprises a sensor circuit to generate a differential voltage dependent on the resistance of the resistive element (VBE1, VBE2) and a reference circuit to generate a differential reference voltage (VBE3, VBE4) and a sigma-delta converter comprising a first stage (400), wherein a first capacitor (C2P) is selectively coupled to one of the output terminals of the sensor circuit and a second capacitor (C1P) is coupled to one of the output terminals of the reference circuit. The circuit generates logarithmically compressed values.
G01N 27/12 - Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon reaction with a fluid
G01N 33/00 - Investigating or analysing materials by specific methods not covered by groups
We disclose herein a method for testing and/or calibrating a thermopile based device. The method comprising: applying an electrical bias of a first polarity to the thermopile based device and measuring a first value of an electrical parameter; and applying an electrical bias of a second polarity to the thermopile based device and measuring a second value of an electrical parameter.
G01J 5/12 - Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors using thermoelectric elements, e.g. thermocouples
We disclose herein an infra-red (IR) detector comprising a substrate comprising at least one etched portion and a substrate portion; a dielectric layer disposed on the substrate. The dielectric layer comprises at least one dielectric membrane, which is adjacent to the etched portion of the substrate. The detector further comprises a first sensing area and a second sensing area each located in a dielectric membrane and a plurality of thermocouples. At least one thermocouple comprises first and second thermal junctions. The first thermal junction is located in or on the first sensing area and the second thermal junction is located in or on the second sensing area.
G01J 5/12 - Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors using thermoelectric elements, e.g. thermocouples
H01L 27/16 - Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including thermomagnetic components
We disclose herein an infra-red (IR) device comprising a substrate comprising an etched cavity portion and a substrate portion; a dielectric layer disposed on the substrate. The dielectric layer comprises a dielectric membrane which is adjacent, or directly above, or below the etched cavity portion of the substrate. The device further comprises a reflective layer on or in or above or below the dielectric membrane to enhance emission or absorption of infrared light at one or more wavelengths.
We disclose an Infrared (IR) device comprising a first substrate comprising a first cavity; a dielectric layer disposed on the first substrate; a second substrate disposed on the dielectric layer and on the opposite side of the first substrate, the second substrate having a second cavity. The device further comprises an optically transmissive layer attached to one of the first and second substrates; a further layer provided to another of the first and second substrates so that the IR device is substantially closed. Holes are provided through the dielectric layer so that a pressure in the first cavity is substantially the same level as a pressure in the second cavity.
We disclose a chemical sensing device for detecting a fluid. The sensing device comprises: at least one substrate region (1) comprising at least one etched portion; a dielectric region (3) formed on the at least one substrate region, the dielectric region comprising at least one dielectric membrane region (3) adjacent to the at least one etched portion; an optical source (2) for emitting an infra-red (IR) signal; an optical detector (4) for detecting the IR signal emitted from the optical source; one or more further substrates (6) formed on or under the dielectric region, said one or more further substrates defining an optical path for the IR signal to propagate from the optical source to the optical detector. At least one of the optical source and optical detector is formed in or on the dielectric membrane region.
G01N 21/3504 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
G01N 33/00 - Investigating or analysing materials by specific methods not covered by groups
We disclose a micro-hotplate comprising a substrate comprising an etched portion and a substrate portion and a dielectric region over the substrate. The dielectric region comprises first and second portions. The first portion is adjacent to the etched portion of the substrate and the second portion is adjacent to the substrate portion of the substrate. The micro- hotplate further comprises a heater formed in the dielectric region, and a ring structure formed within and/or over the dielectric region such that the ring structure is coupled with the first and second portions of the dielectric region.
G01N 27/12 - Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon reaction with a fluid
G01N 27/16 - Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature caused by burning or catalytic oxidation of surrounding material to be tested, e.g. of gas
M&C PC927975WO 2 7139274-1-CMORRIS ABSTRACT: We disclose herein an environmental sensor system comprising an environmental sensor comprising a first heater and a second heaterin which the first heater is configured to consume a lower power compared to the second heater. The system also comprises a controller coupledwith the environmental sensor. The controller is configured to detect if a measured value of a targeted environmental parameter is present. The controller is configured to switch on at least one of the first and second heaters based on the presence and/or result of the measured value of the targeted environmental parameter.
G01N 27/12 - Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon reaction with a fluid
G01N 21/3504 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
G01N 27/16 - Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature caused by burning or catalytic oxidation of surrounding material to be tested, e.g. of gas
A method for testing a batch of environmental sensors to determine the fitness for purpose of the batch of environmental sensors, the method comprising: performing a plurality of electrical test sequences to the heater inputs of the batch of environmental sensors to measure electrical responses of the sensor outputs of the batch of environmental sensors; for at least one environmental sensor correlating measured electrical responses to measured environmental responses so as to define correlated electrical test limits; and determining the fitness for purpose of the batch of environmental sensors if the measured electrical responses are within the correlated electrical test limits.
We disclose herein a thermal IR detector array device comprising a dielectric membrane (2), supported by a substrate, the membrane having an array of IR detectors (4, 5), where the array size is at least 3 by 3 or larger, and there are tracks (3) embedded within the membrane layers to separate each element of the array, the tracks also acting as heatsinks and/or cold junction regions.
G01J 5/12 - Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors using thermoelectric elements, e.g. thermocouples
G01J 5/20 - Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors using resistors, thermistors or semiconductors sensitive to radiation, e.g. photoconductive devices
We disclose an array of Infra-Red (IR) detectors comprising at least one dielectric membrane (2, 3) formed on a semiconductor substrate comprising an etched portion; at least two IR detectors (4, 5), and at least one patterned layer (7) formed within or on one or both sides of the said dielectric membrane for controlling the IR absorption of at least one of the IR detectors. The patterned layer comprises laterally spaced structures.
G01J 5/12 - Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors using thermoelectric elements, e.g. thermocouples
G01J 5/20 - Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors using resistors, thermistors or semiconductors sensitive to radiation, e.g. photoconductive devices
An electronic device comprising: a control and measure subsystem (120) configured to receive an output signal from the at least one sensor (110), to obtain sensor measurement data and to pass them to a comparator (130) configured to compare the sensor measurement data to previous measurement data. If a change is detected that exceeds a first predetermined threshold limit, then a first processor (140) is informed about the obtained sensor measurement data.
We disclose herein a method for heating a gas sensing material formulation on a microhotplate which comprises: a dielectric membrane formed on a semiconductor substrate comprising an etched portion; and the gas sensing material formulation being located on one side of the dielectric membrane. The method comprising: selectively heating the gas sensing material formulation using an infra-red (IR) heater located over the substrate, and controllably cooling the semiconductor substrate using a cooling baseplate provided under the substrate and using an insulating medium located between the substrate and the cooling base plate so that a gas sensing structure is formed on said one side of the dielectric membrane from the gas sensing material formulation.
G01N 27/12 - Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon reaction with a fluid
Disclosed herein is a gas sensing device comprising a dielectric membrane formed on a semiconductor substrate comprising a bulk-etched cavity portion, a heater located within or over the dielectric membrane, a material for sensing a gas which is located on one side of the membrane, a support structure located near the material, and a gas permeable region coupled to the support structure so as to protect the material.
G01N 27/414 - Ion-sensitive or chemical field-effect transistors, i.e. ISFETS or CHEMFETS
G01N 27/12 - Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon reaction with a fluid
G01N 27/22 - Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
patents
