32results about How to "Reduce temperature drift" patented technology

The invention relates to a system for measuring a physical variable using a plurality of measuring sensors (20). Said system is characterized in that an inverting measuring signal amplifier (17; 17.1, 17.2) is connected downstream of every measuring sensor (20), one output of a sensor (20) each being connected to an inverting input of the measuring signal amplifier (17; 17.1, 17.2) connected downstream of the measuring sensor (20).

A sensor system includes a sensor device (10) and an integrated circuit (20) for driving the device (10). The device (10) includes a sensor body (1) of a silicon-based material, an upper sealing member (2) of a silicon-based material and a lower sealing member (3) of a silicon-based material. The upper sealing member (2) and the lower sealing member (3) are joined together to cooperatively house the body (1) therewithin in an airtight manner. The device (10) and the circuit (20) are formed as a stacked body. The body (1) is electrically connected to a wiring pattern (12) of the circuit (20) through a conductive through-path (4) penetrating the upper sealing member (4) and a mounting electrode (5) provided on an outer surface of the upper sealing member (2). The device (10) is connected to an MID substrate (30) through the circuit (20).

An improved bridge circuitry is presented for improved soil sensor measurements. The improved bridge circuitry may include blocking capacitors, the ability to apply bias voltage, and the substitution of AC meters with DC meters and other improvements.

A structure for supporting a vibrator 1 is provided. The structure comprises a substrate 12 and bonding wires 14A, 14B fixed to the substrate 12 and connected with the vibrator 1. The vibrator 1 is supported with the bonding wires so that the vibrator 1 is not directly contacted with the substrate 12. “fd” and “fw” satisfy the following formula (1). “fd” represents a resonance frequency of a driving vibration mode of the vibrator and “fw” represents a characteristic frequency of a vibration mode of the bonding wire at room temperature.

(fd/2)×1.05≦fw, or, fw≦(fd/2)×0.95  (1)

The present invention provides an optical deflector which is capable of reducing a temperature drift of a strain gauge due to a temperature gradient, and detecting with high accuracy an angular displacement of a mirror surface. The optical deflector which deflects light includes a movable plate, two fixed portions which are disposed at an outer side of the movable plate, two elastic supporting members which are disposed such that the elastic supporting members are substantially symmetric about a center line of the movable plate, and which connect the movable plate and the two fixed portions, an angular-displacement detecting portion having a Wheatston bridge as a measuring portion which includes two active resistors, and two reference resistors, and detects an angular displacement of the movable plate, and at least one resistor element, such as the two active resistors are provided on the elastic supporting portion. In the optical deflector, all the four resistor elements are in an isothermal characteristics area which is an area in which all the resistor elements are at approximately the same temperature condition.

A micro electric field sensing device based on an electrostatic force and a piezoresistive effect comprises a semiconductor film which is placed in a horizontal direction and can vibrate freely in a vertical direction. A substrate is arranged below the semiconductor film, the semiconductor film is connected with the substrate through an insulating layer, the middle area of the semiconductor film is covered with a metal film, a metal electrode is arranged in the peripheral area of the semiconductor film, the metal film is grounded or connected with a power supply through the metal electrode, the middle area of the semiconductor film is connected with the peripheral fixed part through a semiconductor spring, and piezoresistive materials are arranged on the semiconductor spring. The piezoresistive materials are connected through the metal electrode to form a Wheatstone bridge structure. The micro electric field sensing device is small in size, high in integration degree, high in resolution ratio, large in response, wide in measurement amplitude range and capable of achieving non-invasive measurement of a direct-current electric field and a time-varying electric field in different testenvironments.

There is provided a highly accurate electrical capacitance diaphragm pressure sensor capable of reducing temperature drift that arises when a pressure-travel coefficient changes with temperature variations of a fluid whose pressure is sensed. A sapphire diaphragm pressure sensor, in which sapphire diaphragms are arranged in opposing relation, comprises a pressure sensing element (10, 30) having a pressure receiving part (10A, 30A) with a deposition electrode formed on each of the opposing faces of sapphire diaphragms which are provided in opposing relation to each other and a securing part with a metal deposited on a part of each of the surfaces of the sapphire diaphragms, and further comprises a metal base (11, 31) for securing the pressure sensing element at the securing part of the pressure sensing element, a conductive sealing agent (13, 33) for sealing a gap between the securing part on which a metal is deposited and said metal base, and a nickel protective layer (14, 34) for protecting at least said conductive sealing agent from a medium whose pressure is to be measured.

The invention discloses a bottom vision and inertial navigation information fusion directional compass, and belongs to the technical field of positioning devices. The directional compass includes a data acquisition unit and a processor; the data acquisition unit includes an inertial measurement unit and a bottom-view mounted camera, the inertial measurement unit is used for collecting the three-axis angular velocity and the acceleration of a carrier in a three-dimensional space, and the camera is used for acquiring the image sequence of the bottom of the carrier; and the processor obtains an attitude angle by using data acquired by the inertial measurement unit, obtains a course angle by using data acquired by the camera, and fuses the attitude angle with the course angle to obtain the final course angle of the carrier. The directional compass has a high reliability and a strong real-time performance, can work in an environment with magnetic interference and aerial works, and can be used for measuring the course angles of robots and unmanned aerial vehicles.

The invention discloses a food deterioration detecting device with a voice broadcasting function. The food deterioration detecting device comprises a control module. The control module is respectively connected with a sensing module, a liquid crystal display module, a keyboard, a real-time clock module and a voice broadcasting module. The food deterioration detecting device has the advantages that the sensing module is used to detect the moisture, resistance and temperature of food, data offset can be well eliminated, temperature excursion and false detection can be reduced, the device is small in size, high in precision, good in stability, and the like, and the defect that a bacterial culture method for detecting the food is long in time and poor in portability is overcome; the device is multifunctional, can detect the resistance and moisture content of the food, and also has temperature measuring and timing functions; the measured data is digitally displayed through the liquid crystal display module accurately, and the device also provides the voice broadcasting function to allow elder people with poor eyesight to use the device conveniently.

A preamplifier substrate on which a preamplifier is mounted, the preamplifier being configured to amplify electromotive forces detected by a pair of surface electrodes, is disposed outside a flux region where a magnetic flux is produced, and the preamplifier substrate extends in a direction intersecting a measuring tube.

An object of the present invention is to provide a novel structure of supporting a vibrator having a terminal for electrical connection so that the vibrator can be miniaturized, and the driving impedance can be made constant in a wide temperature range to reduce the temperature drift. The structure has a substrate and bonding wires 45, 46 supported on the surface of the substrate and to be connected with the vibrator. The vibrator is supported with the bonding wire so that the vibrator is not directly contacted with the substrate. The bonding wire is electrically connected with the terminal. The resonance frequency “fr” of the supporting structure, the driving frequency “fd” for the vibrator and the detuning “Δf” satisfy the following formula

1.1·Δf≦fr≦0.9·fd.

The invention discloses an image detection device comprising a reference part, a scanning part, and a light separation panel. The reference part is used for obtaining a brightness reference value; the scanning part is used for obtaining image information of a collected object; and the light separation panel arranged between the reference part and the scanning part is used for carrying out light separation on the reference part and the scanning part. With the device, stable image data collection can be realized; and influences of a temperature drift and a time drift can be reduced.

The invention discloses a temperature drift attenuation method for a digital oscilloscope and the digital oscilloscope. The digital oscilloscope comprises an impedance conversion network, an attenuation network and a bias adjustment circuit. Firstly, a vertical gear setting value of the digital oscilloscope is obtained; then, a bias voltage signal output by the bias adjusting circuit is attenuated or amplified according to the vertical gear set value, and the attenuated or amplified bias voltage signal is output to the impedance conversion network, so that the impedance conversion network superposes the attenuated or amplified bias voltage signal and an output signal of the attenuation network; and the temperature drift phenomenon is attenuated when the digital oscilloscope displays the waveform. The bias voltage signal is adjusted according to the vertical gear setting value, so that the temperature drift phenomenon is attenuated, the waveform display effect of the digital oscilloscope is enhanced, and the user experience is improved.

A disclosed electronic north-seeking voice broadcast apparatus comprises a control module connected with a magnetic-resistance sensing module, a liquid crystal display module, a keyboard, a real-time clock module and a voice broadcast module. The electronic north-seeking voice broadcast apparatus employs the magnetic-resistance sensing module for detecting terrestrial magnetism, avoids the problems that a conventional mechanical compass is bad in portability and low in sensitivity and the service life is reduced because of mechanical wearing, especially is diversified in functions, is capable of seeking north and also is capable of timing. A measured northerly azimuth angle is digitally displayed through the liquid crystal display module and is accurate, and also the apparatus possesses voice broadcast function, and facilitates the elderly with bad eyesight to use the apparatus.