842results about How to "Measurement stability" patented technology

A system comprising an implantable medical device (IMD). The IMD includes an implantable sensor operable to produce an electrical signal representative of mechanical activity of a heart of a subject and a controller circuit coupled to the sensor. The IMD also includes a heart sound sensor interface circuit to produce a heart sound signal, a tachyarrhythmia detector, and a controller circuit. The controller circuit includes a hemodynamic stability assessment module configured to determine that at least one episode of ventricular tachyarrhythmia is detected in a subject and obtain a measurement of hemodynamic stability of the ventricular tachyarrhythmia from the heart sound signal.

A ranging device including: a lens array member which has first and second ranging lenses, optical axes of the pair of ranging lenses being parallel to each other, and first and second optical images of a subject being formed by the first and the second ranging lenses respectively; a mirror array member which has first and second reflecting members, each of the pair of reflecting members being provided with a reflecting plane; a medium mirror member which has first and second reflecting planes, the medium mirror member being arranged between the pair of reflecting members; an imaging element which is configured to convert the first and the second optical images to electronic signals; and an electronic circuit which is configured to calculate a distance to the subject based on the electronic signals output from the imaging element.

The invention discloses a product detection method based on machine vision. The product detection method can achieve automatic detection of product defects by use of machine vision and template matching, locate the coordinates of defective products, control a mechanical arm to grab the unqualified products and to place the unqualified products in a disqualification area by a data acquisition card, and convey products passing through detection to the next workstation by a production line. The product detection method can achieve subtle high-precision detection of missing, deflection and parameter errors of such electronic components as resistors on a PCB, as well as status disqualification of a dial switch; through edge grabbing arrangement of the six-degrees-of-freedom mechanical arm, the detected unqualified products are automatically grabbed away from the production line to realize automation of the whole process; and in combination with matching and high-precision location of edge detection, the approximate positions of the products are found by matching at first, then the pixel coordinates and the angle of a corner of each cuboid product are determined via detection of two edges, the unqualified products are automatically grabbed out, and the product detection method is suitable for detecting different products.

An annul protecting portion 23 having a thickness larger than the thickness of a sensor sensitive portion 1 is provided in such a manner as to surround the sensor sensitive portion 1, the sensor sensitive portion 1 together with the protecting portion 23 is placed between living tissues, so as to ensure that the gate portion 7 is not subjected to an external pressure by coming into contact with the living tissues. Further, outer peripheries of lead wires 4 on the sensor sensitive portion 1 side are covered with a plasticity material 24 woven into a tubular shape by a metal wire such as a stainless steel wire, and is grounded together with the metallic protecting portion, so as not to be subjected to induction noise. Further, the metal wire is bent to hold the sensor sensitive portion 1 at a suitable angle.

The invention discloses an inhalable dust concentration measuring sensor, comprising: a semiconductor laser light source. An aspherical mirror, an incidence diaphragm, an extinction diaphragm, a photosensitive area, a spherical reflecting mirror, an emergent diaphragm and a light trap are arranged in turn in the forward direction of the beam. The extinction diaphragm is of a long tube shape, and the opening of the diaphragm is close to the photosensitive area; the spherical reflecting mirror located at the right side of the extinction diaphragm ensures that the photosensitive area and the photosensitive surface of a photoelectric detector are respectively located at the two sides near the spherical center of the spherical reflecting mirror and the physical image relation in geometrical optics is met; the photoelectric detector is a high-sensitivity photoelectric diode; and the sampling nozzles in the gas path are distributed with respect to the photosensitive area. In the invention, the measurement is more accurate as the quality concentration of the inhalable dust is calculated by the energy sum of scattered lights in the particle swarm, and the measuring sensor has wide application as being free from the limit of the total particle number in a unit volume; the signal-to-noise ratio of the sensor is greatly improved as the light path is provided with three diaphragms; and the noise is low, and the measurement is more accurate and stable as the concentration measuring circuit adopts an integral method.

A process for measuring particle concentrations in a gas using an ejector for producing an essentially constant sample flow and for efficient mixing of the particle-containing sample and and essentially clean, ionized gas. The invention also relates to an apparatus implementing such process. The process and the apparatus can be utilized for example in measuring particle concentrations in an exhaust system of a combustion engine.

The invention is a process tank containing a direct level magnetostrictive measurement system disposed directly in the tank, where the level system preferably communicates to a remote location. One embodiment of the invention embodies an internal well guide chamber, which exactly replicates the actual vessel's internal conditions (pressure and temperature), and also prevents the float from being affected by turbulence from a two phase condition, such as might occur if boiling or flashing is present inside the vessel. The process tank should have a fluid temperature different by more than 50° C. form the ambient environment, or alternatively, be a flashing tank.

The invention relates to a method for manufacturing an embedded multi-layer composite thin-film cutting temperature sensor, in particular to a method for measuring the transient cutting temperature of a cutter point during cutting and manufacturing, and belongs to the temperature sensor field. SiO2 insulating film deposition on a cutter body is carried out for a plurality of times, so as to form a multi-layer composite thin film; then a thin-film thermocouple is formed through sputtering deposition of a NiCr thin-film electrode and a NiSi thin-film electrode; and then the prepared thin-film thermocouple is embedded into a protective layer. The radio-frequency reactive unbalanced magnetron sputtering technology is enhanced by adopting a microwave ECR plasma; the prepared thin-film thermocouple is embedded into the protective layer, so as to be prepared into an embedded multi-layer composite thin-film temperature measurement sensor integrating the cutting and the temperature measurement. The sensor has the advantages of long service life and cost-effectiveness. The thermocouple has the advantages of minimum size of a hot end and short response time, thereby achieving the submicrosecond level. A compensation conducting wire is hidden in a cutter head, so that the anti-interference capability is strong. Therefore, the cutting temperature of the cutter point can be measured rapidly, accurately and stably by the method.

An orthogonal acceleration time-of-flight (oa-TOF) mass spectrometer has an ion source producing ions, a first region of a low degree of vacuum, an ion reservoir, and a second region of a high degree of vacuum. A space for transporting the ions produced by the ion source is placed in the first region. The ion reservoir accelerates the ions transported in from the first region in a pulsed manner and extracts the ions. A time-of-flight mass analyzer for mass separating the ions extracted from the ion reservoir is disposed in the second region, together with the ion reservoir. An isolation valve is mounted in a hole that places the first and second regions in communication with each other to permit the first and second regions to be isolated from each other.

The present invention provides a cantilever having a base fixed to an inspecting apparatus, a beam protruding from the base, and a probe fixed to an end of the beam, wherein: the probe is formed by use of a carbon nanotube; and the probe is fixed by metal layers from at least two directions when the cantilever is operated, the probe protrudes in a direction in which a sample is fixed. It is possible to prevent the probe from warping and suppress image failures during observation of a sample.

Using geometric characteristics of outer margin curves of two light spots at different distances along direction of beam transmission, the disclosed method obtains divergence angle of laser. Through rotational scanning detection, concentric placed two light detectors perpendicular to each other obtain outer margin curves. Multiple optical fibers are distributed on the said light detector evenly. The disclosed device is composed of drive power supply, cooling water platform, cooling water circulation system, 4D traveling platform, electrical motor set, drive, data acquisition module, and PC etc. The light-receiving module includes light detectors. The light-receiving module, data acquisition module, and PC are connected electrically. The invention solves issue of test error caused by regarding face radiation of area array laser as spot light source so as to avoid damaging and burning detector caused by too large power of laser. Advantages are: accurate and reliable.

A method for measuring the absolute concentration of oxygenated and reduced hemoglobin in human tissue features that its sensor is composed of 2 photoelectric receiving tubes and at least 3 light sources with different wavelengths, which are arranged on a straight line at intervals. Said absolute concentration can be calculated out. Said light source can emit respectively red light and near infrared light.

The present invention provides a semiconductor pattern shape evaluating apparatus using a critical dimension SEM, which eliminates the necessity of data conversion corresponding to each process of semiconductor manufacturing conventionally required; controls possessed data integratedly; can select data effective for use in each process from the possessed data easily; if the shape of formed pattern changes with time, can create a photographing recipe which enables stable measurement by correcting the photographing recipe based on time-series data. Specifically, the semiconductor pattern shape evaluating apparatus correlates coordinate systems among diversified data to control the diversified data stored in a database integratedly, selects part or all of the diversified data arbitrarily and creates a photographing recipe for observing a semiconductor pattern with a critical dimension SEM using selected data.

Pretreatment of residual food removal and bacteria dyeing, and measurement of the number of bacteria using the fluorescence flow cytometry method, are stably performed by easy operations.

A measurement chip 10 includes: a specimen container 151; a reaction container 170 for mixing a specimen and a dyeing reagent into a liquid mixture; a bacteria detection portion 18 being irradiated with excitation light; a detection liquid waste container 163 into which liquid mixture which has passed the bacteria detection portion enters; a solution flow path 157 which connects the specimen container, the reaction container and the bacteria detection portion, and ventilation ports 1631 through 1633 which are connected to the specimen container, the reaction container and the detection liquid waste container, through a air flow path and is connected to a chip connecting tube. Bacteria are detected in the bacteria detection portion 18 by switching of the states of the specimen container, the reaction container, and the detection liquid waste container between a sealed state and a state open to the atmospheric pressure, by moving the specimen to the reaction container 170 to mix and stir the specimen and the dyeing reagent, and by moving of the liquid mixture to the detection liquid waste container 163.

A blood test apparatus having a simple constitution whereby stable measurement can be conducted by surely sampling the blood in an amount being small but sufficient for the test without placing too much burden on a patient.

When a first skin contact sensor of this apparatus detects the skin, driving of a negative pressure unit is initiated (time point 166a). Thus, the skin rises and comes into contact with a second skin contact sensor (time point 166b). After piercing into the skin at time point 166c, the negative pressure supply is once ceased. Next, the negative pressure is applied again at time point 166d for a definite period of time. Thus, the opening in the skin is broadened, which facilitates the flow out of the blood (16).

An imaging apparatus includes: an imaging unit; a focal range control unit configured to cause the imaging unit to capture a first image and a second image which have mutually different focal ranges, changing a focal position of the imaging unit; a reference image generation unit configured to generate, using the first image and the second image, a reference image to be used as a blur standard; and a distance measurement unit configured to measure a distance to the subject based on a difference in blur degrees between the reference image and each of the first image and the second image. The focal ranges of the first image and the second image are independent of each other, and an out-of-focus space is provided between the focal ranges.

The invention discloses a method and device for rapidly measuring a dielectric loss angle based on time domain quasi-synchronization. The measuring method comprises the following steps of signal sampling, fundamental frequency estimation, reconstitution of a quasi-synchronization sampling sequence of sampled signals, frequency analysis based on the FFT, fundamental wave phase angle calculation and dielectric loss angle calculation. The measuring device comprises a power module. The power module is respectively and electrically connected with an analog-digital converter and a digital signal processor. The analog-digital converter is respectively connected with a voltage measurement signal converting circuit, a current measurement signal converting circuit and a standard reference voltage module. The analog-digital converter is connected with a digital signal processor through an SPI. The digital signal processor is electrically and respectively connected with a reset module, a debugging JTAG interface, a synchronization dynamic random access memory, an FLASH and an active crystal oscillator. According to the detecting method, rapid, accurate and stable measurement of the dielectric loss angle can be achieved, sampling time is short, the sampling data size is small, the algorithm is simple, operand is small, and an embedded system is easy to obtain. The measuring device is accurate in measurement.

This invention relates to one oil and water mixture meter device, which comprises front and back tar, pre-division rotation device, clear inclination test tube, gas micro difference sensor, liquid difference sensor, pressure sensor, temperature sensor and gas and liquid exit hole, wherein, the gas side tube is connected with front and back tar and clear inclination measurement tube by 1.5 degree; setting three liquid difference voltage sensor in between and one gas difference sensor and setting two difference sensors between middle and down parts of tar; setting pressure sensor and temperature sensor in back tar to take gas and liquid threshold height and lift, and pressure impulse signals to get difference signal continual time process and each character value.