736 results about "Detector cell" patented technology

An optical measurement device and method are presented for use in non-invasive measurements on a patient's body. The device comprises an illumination assembly configured and operable to generate illuminating light of a predetermined wavelength range; a detection assembly; and a light directing assembly. The detection assembly comprises a first detector unit for detecting a first light signal transmitted through an illuminated body portion and generating first measured data indicative of the detected transmitted light, and a second detector unit for detecting a second light signal reflected from the illuminated body portion and generating second measured data indicative of the detected reflected light. The light directing assembly comprises a light diffuser for scattering back light incident thereto, to thereby direct the illuminating light or the light coming from the body portion back towards the body portion. This technique provides for increasing the amount of light reaching a region of interest inside the body portion and maximizing homogeneity of the first and second detected light signals.

A method for geometric calibration of a CT scanner, including, for each row of at least one row of detector cells, establishing a complete geometric description of the CT scanner, including at least one unknown geometric parameter, establishing a description of a forward projection function using the complete geometric description, acquiring actual projection coordinates of a calibration phantom placed in a scanning field of view (SFOV) on a current row of detector cells and corresponding to a plurality of angles, acquiring calculated projection coordinates of the calibration phantom on the current row of detector cells and corresponding to the plurality of angles using the description of the forward projection function, and acquiring a calibrated value for the at least one unknown geometric parameter by evaluating the at least one unknown geometric parameter based on the acquired actual projection coordinates and calculated projection coordinates via a nonlinear least square fitting algorithm.

A listening instrument includes a) a microphone unit for picking up an input sound from the current acoustic environment of the user and converting it to an electric microphone signal; b) a microphone gain unit for applying a specific microphone gain to the microphone signal and providing a modified microphone signal; c) a direct electric input signal representing an audio signal; d) a direct gain unit for applying a specific direct gain to the direct electric input signal and providing a modified direct electric input signal; e) a detector unit for classifying the current acoustic environment and providing one or more classification parameters; f) a control unit for controlling the specific microphone gain applied to the electric microphone signal and / or the specific direct gain applied to the direct electric input signal based on the one or more classification parameters.

A multi-function display controller that includes a source detector unit for determining if the source of an input stream is either film originated source originated or video source originated. A source converter unit for converting the input image stream to a common signal processing format is coupled to the source detector unit. Once converted to the common signal processing format, a determination is made if the input image stream is interlaced or non-interlaced (progressive scan). If the input image stream is interlaced, a de-interlace unit converts the interlaced signal to progressive scan using either motion adaptive or motion compensated de-interlacing techniques. It should be noted that in the described embodiment, motion vectors generated for use by the motion compensated de-interlace can be optionally stored in a memory unit for use in subsequent operations, such as motion compensated frame rate conversion or noise reduction (if any).

A radiation detector includes an array of detector pixels each including an array of detector cells. Each detector cell includes a photodiode biased in a breakdown region and digital circuitry coupled with the photodiode and configured to output a first digital value in a quiescent state and a second digital value responsive to photon detection by the photodiode. Digital triggering circuitry is configured to output a trigger signal indicative of a start of an integration time period responsive to a selected number of one or more of the detector cells tranisitioning from the first digital value to the second digital value. Readout digital circuitry accumulates a count of a number of transitions of detector cells of the array of detector cells from the first digital state to the second digital state over the integration time period.

A laser-based atomic magnetometer (LBAM) apparatus measures magnetic fields, comprising: a plurality of polarization detector cells to detect magnetic fields; a laser source optically coupled to the polarization detector cells; and a signal detector that measures the laser source after being coupled to the polarization detector cells, which may be alkali cells. A single polarization cell may be used for nuclear magnetic resonance (NMR) by prepolarizing the nuclear spins of an analyte, encoding spectroscopic and / or spatial information, and detecting NMR signals from the analyte with a laser-based atomic magnetometer to form NMR spectra and / or magnetic resonance images (MRI). There is no need of a magnetic field or cryogenics in the detection step, as it is detected through the LBAM.

An adaptive noise canceling system for extracting a desired signal, comprising an adaptive noise cancellation filtering circuit for suppressing noise from a first input signal using a second input signal as a reference signal, and generating an output filtered signal representing the desired signal; and an adaptive noise cancellation controller for receiving the first and second input signals and the output filtered signal, and generating an output control signal for controlling coefficients of at least one adaptive filter of the adaptive noise cancellation filtering circuit, comprising a silence detector unit for detecting whether an acoustical signal is present in the input signals and the output filtered signal, and generating a first output signal which indicates whether the acoustical signal is present; a signal detector unit for detecting whether the desired signal is present in the input signals and the output filtered signal, and generating a second output signal which indicates whether the desired signal is present; and an adaptive noise cancellation filter (ANCF) controller unit for receiving the first and second output signal to determine the characteristic of the input signals, and generating the output control signal which represents an updated coefficient parameter for updating the coefficients of the at least one adaptive filter of the adaptive noise cancellation filtering circuit.

In a MRI system having a FID detector unit and a computer unit for processing FID signals, phase errors introduced into the FID signal at the detector unit are corrected at the computer unit by transmitting a pilot signal from the computer unit to the detector unit, processing the pilot unit along with a detected FID signal at the detector unit, transmitting the processed signals to the computer unit, obtaining the pilot signal and FID signal at the computer unit, and combining the pilot signal and the FID signal whereby phase errors cancel.

A radiation detector includes an array of detector pixels each including an array of detector cells. Each detector cell includes a photodiode biased in a breakdown region and digital circuitry coupled with the photodiode and configured to output a first digital value in a quiescent state and a second digital value responsive to photon detection by the photodiode. Digital triggering circuitry is configured to output a trigger signal indicative of a start of an integration time period responsive to a selected number of one or more of the detector cells transitioning from the first digital value to the second digital value. Readout digital circuitry accumulates a count of a number of transitions of detector cells of the array of detector cells from the first digital state to the second digital state over the integration time period.

A radiation detector assembly has a semiconductor detector array substrate of CdZnTe or CdTe, having a plurality of detector cell pads on a first surface thereof, the pads having a contact metallization and a solder barrier metallization. An interposer card has planar dimensions no larger than planar dimensions of the semiconductor detector array substrate, a plurality of interconnect pads on a first surface thereof, at least one readout semiconductor chip and at least one connector on a second surface thereof, each having planar dimensions no larger than the planar dimensions of the interposer card. Solder columns extend from contacts on the interposer first surface to the plurality of pads on the semiconductor detector array substrate first surface, the solder columns having at least one solder having a melting point or liquidus less than 120 degrees C. An encapsulant is disposed between the interposer circuit card first surface and the semiconductor detector array substrate first surface, encapsulating the solder columns, the encapsulant curing at a temperature no greater than 120 degrees C.

An apnea detector is disclosed. In some embodiments, a detector unit in communication with a capacitive type sensor is adapted to receive an electrical signal which is indicative of variable capacitance resulting from movement of a subject and to emit an alert signal when the received electrical signal is indicative of symptoms of apnea. In one embodiment, a detector unit is in communication with a curvature sensor adapted to detect a variable curvature of a subject body surface resulting from breathing patterns of a subject. The detector unit is attached to an article of clothing of the subject. A monitoring system comprises a detector unit for detecting one or more subject related parameters of interest and for emitting acoustical information after determining that a subject related parameter of interest has a predetermined status, and a stationary unit disposed within an audible range of the detector unit for receiving the emitted acoustical information.

A three-dimensional imaging system for forming a three dimensional image of an object tooth includes a projection unit capable of generating a projected light pattern and a detector unit capable of detecting an image pattern received from the object tooth. An optical transceiver unit transmits the projected pattern generated by the projection unit to the object tooth and receives the image pattern from the object tooth. The optical transceiver is formed of an integrated body having at least first and second transmitting faces and a reflecting surface that reflects light propagating within the body. In some embodiments, the projected pattern light is polarized in one polarization state and the detected image light is polarized in a second polarization state orthogonal to the first polarization state.

A method and a system (400) for detection and position determination of chips (100), which transmit ultrasound signals in a room. The system (400) comprises electronic identification chips (100), which are attached to objects that have to be monitored. Each chip (100) is equipped with a transmitter (179) and a receiver (180). The signals are received by a plurality of detector units (290), which are connected to a detector base unit (200) that registers and interprets the signals transmitted form the identification chips (100). Detector base units (200) located in different rooms are interconnected in a network (215) and transmit processed information to one or more central units (410) for further interpretation and sorting. The special feature of the invention is that line interference is substantially removed, and it is possible to determine position even though the identification chips (100) are in motion.

PCT No. PCT / DE98 / 00713 Sec. 371 Date Dec. 22, 1999 Sec. 102(e) Date Dec. 22, 1999 PCT Filed Mar. 10, 1998 PCT Pub. No. WO98 / 45664 PCT Pub. Date Oct. 15, 1998What is described here is a measuring system for the non-contacting detection of the three-dimensional shape of a groove peripherally extending in a spectacle frame, comprising a light source directing its light beam onto the groove or having its beam deflected thereon by means of an optical deflector system, an optical imaging system which projects the light reflected at the groove onto an optical detector unit and which is disposed in a centered position relative to the groove to be measured on the spectacle frame, a holding means supporting the spectacle frame, which is supported for rotation relative to the light source, the detector system and the optical imaging system about a centering axis of a surface inscribed by the peripheral groove of the spectacle frame, as well as an evaluation unit for determining the three-dimensional shape of the groove, which operates in correspondence with the triangulation principle. Moreover, an appertaining method is proposed.

A method and system for an improved data acquisition system with an image detector array and an image processing system which finds a malfunctioning cell, interpolates a signal for the malfunctioning cell using neighboring channels of the cell, and corrects the interpolation with an error rate found in performing interpolations on neighboring rows with cells which are not malfunctioning. The image processing system may include a DAS and a reconstruction system. The step of finding a malfunctioning cell may be accomplished through a variety of methods, such as measuring discrepancies between a cell's and its neighboring cell's average readings over time and exposing the cells to x-rays which should produce similar readings in all the cells and comparing the cells' signals, looking for discrepancies. The step of interpolating and the step of correcting may take into consideration cells within the same projection view as the malfunctioning cell.

An apparatus for fire detection in an electrical equipment rack includes a suction pipe system which communicates with the rack monitored through at least one suction opening and through which a representative air sample is drawn from the rack, an early fire detection module having at least one detector unit for detecting at least one fire parameter in the air sample extracted through the suction pipe system, and a controller for issuing an early fire detection signal in response to the result detected with the at least one detector unit. The early fire detection module is configured as a rackmount to be inserted into the rack.

The image pickup apparatus of the radiological imaging apparatus of the present invention includes many detector units, a ring-shaped detector support member and an X-ray source circumferential transport apparatus. Each of the detector units is attached to the detector support section in a detachable manner. A plurality of radiation detectors provided for the detector units are arranged in three layers in the radius direction of the detector support member and in three columns in the axial direction of the detector support member. Since the radiation detectors are arranged in three layers in the radius direction, it is possible to recognize the detection position of radiation in the radius direction in detail. Furthermore, since the detector units are attached in a detachable manner, it is easy to replace damaged radiation detectors.

The present invention provides a method of manufacturing a CT detector cell having an x-ray absorption component and a thermal sensing component. The thermal sensing component is configured to detect thermal differentials in the absorption component resulting from the absorption of x-rays.

A multi-stage event detector for monitoring a system to detect the occurrence of multistage events in the monitored system, the multi-stage event detector includes: one or more event detecting detector units (142, 144) for detecting observable events occurring on the monitored system; one or more parameter generating detector units (152, 154) for generating parameter values which vary over time dependent on the behaviour of the monitored system; a hidden state determiner (120) for determining a likely sequence of states of interest of the system based on the outputs of the one or more event detecting detector units; and a transition determiner (130) for determining a likely transition occurrence based on a comparison of a set of values of a parameter or set of parameters generated by one or more of the one or more parameter generating detector units with a plurality of pre-specified functions or sets of values of a corresponding parameter or set of parameters associated with different transition occurrences.

An imaging device for radiation imaging is an array of image cells. The array of image cells consists of an array of detector cells and an array of image cell circuits. Each detector cell is connected to the corresponding cell in the array of image cell circuits. Each individual cell in the detector cell array generates a charge based on the radiation that hits the cell. Each cell in the array of image cell circuits accumulates the charge on a storage capacitor. The storage capacitor can be, for example, the gate of a transistor. Single cells in the array of image cells can be grouped together to form larger area super cells. The size of the super cell can be controlled by control signals, which select the operating mode. The output from a cell, a single cell or a super cell, is read out in current mode and is scaled according to the size of the cell. Several modes can be implemented in the imaging device. Also, an imaging system for larger area radiation imaging can be implemented by connecting several imaging devices together in form of a two-dimensional array. The array of cell circuits comprises separate enable signals for selecting individual rows and columns and output signals indicating an end of row and an end of column.

A modulated laser light detector that converts laser light energy into electrical signals which exhibit a frequency that is substantially the same as the laser light modulation frequency, in which these signals allow the detector unit to determine a position where the laser light is impacting upon a photodiode array. A synchronous rectifier circuit is provided which, by use of a phase locked loop, converts a full-wave analog signal representative of the modulated laser energy into a half-wave analog signal, which is filtered and demodulated to generate a DC level that is indicative of the strength of the received laser light energy. At least two channels of these signals are used to determine the impacting position of the laser light energy.

An apparatus and method for generating incursion alerts in response to incursion events detected by incursion detector units, attached to safety icons such as traffic cones and signage. The incursion detector units are activated by automatic activation sensors and remain activated for a period of time. Alerts are generated in response to impacts detected at the safety icons by an incursion detector and transmitted to one or more incursion receiver units which annunciate the alert with audio, lights, or tactile output to warn personnel of possibly impending danger. Alert signals are preferably repeated by other incursion detectors wherein the distance and conditions over which the alert signals may be communicated is extended. A validation circuit and tilt sensor filter out not incursion events such as wind tipping. The incursion detectors may generate area alerts, or personal alerts and can transmit operational status and alerts to discrete groups of receivers.

A PET apparatus comprises a plurality of detector units in the circumferential direction, wherein the detector unit includes a plurality of unit substrates therein, and wherein the unit substrate includes: a plurality of detectors upon which a γ-ray is incident; and an analog ASIC and digital ASIC for processing a γ-ray detection signal outputted by each of the detectors. The analog ASIC includes two slow systems having mutually different time constants, each of which outputs a pulseheight value. A noise determination part of the digital ASIC determines whether a relevant detection signal is an intended γ-ray detection signal or a noise based on a correlation between the pulseheight values, and a noise counting part counts the number of times of noise determination, and a detector output signal processing control part controls the signal processing with respect to an output signal from a relevant detector based on the count.

A laser-based atomic magnetometer (LBAM) apparatus measures magnetic fields, comprising: a plurality of polarization detector cells to detect magnetic fields; a laser source optically coupled to the polarization detector cells; and a signal detector that measures the laser source after being coupled to the polarization detector cells, which may be alkali cells. A single polarization cell may be used for nuclear magnetic resonance (NMR) by prepolarizing the nuclear spins of an analyte, encoding spectroscopic and / or spatial information, and detecting NMR signals from the analyte with a laser-based atomic magnetometer to form NMR spectra and / or magnetic resonance images (MRI). There is no need of a magnetic field or cryogenics in the detection step, as it is detected through the LBAM.

A method and a system (400) for detection and position determination of chips (100), which transmit ultrasound signals in a room. The system (400) comprises electronic identification chips (100), which are attached to objects that have to be monitored. Each chip (100) is equipped with a transmitter (179) and a receiver (180). The signals are received by a plurality of detector units (290), which are connected to a detector base unit (200) that registers and interprets the signals transmitted form the identification chips (100). Detector base units (200) located in different rooms are interconnected in a network (215) and transmit processed information to one or more central units (410) for further interpretation and sorting. The special feature of the invention is that line interference is substantially removed, and it is possible to determine position even though the identification chips (100) are in motion.

A winding voltage arising in a first winding on the primary side of a transformer is detected in a winding voltage detector unit formed of a second winding, and current flowing through a resonant circuit is detected in a resonant current detector unit formed of an auxiliary capacitor and a resistor. The timing at which the polarity of the detected winding voltage is inverted is detected in a control and drive unit, and the time at which the polarity of the resonant current, whose phase is delayed with respect to that of the winding voltage, will be inverted is determined in advance. In the event that there is a switch in an on-state when the timing immediately before the inversion of the polarity of the resonant current is detected from the output of the resonant current detector unit, the control and drive unit forcibly turns off the switch.