213results about How to "Reduce the effect of temperature" patented technology

A needle trace transfer member to which needle traces of probes are transferred is installed at a movable mounting table to align the probes before electrical characteristics of a target object on the mounting table are inspected by bringing the probes into electrical contact with the target object. The needle trace transfer member is made of a shape memory polymer transformed reversibly and rapidly between a glass state with a high modulus elasticity and a rubber state with a low modulus of elasticity near its glass transition temperature. The glass transition temperature is set to a temperature close to a set temperature of the mounting table. The shape memory polymer is mainly made of polyurethane-based resin.

The invention discloses a method for detecting refrigerant leakage of an air conditioning system and the air conditioning system. The method comprises the steps of: S10, collecting the state parameters of the air conditioning system when the external environment temperature is T in an operating process of the air conditioning system and storing the collected data at the temperature for the first time as reference data; S20, in the operating process of the air conditioning system, when the external environment temperature reaches T again, collecting the state parameters of the air conditioning system again; S30, comparing the collected data with the reference data and calculating deviation therebetween; and S40, when the deviation exceeds a predetermined value, judging the condition of refrigerant leakage. When the method disclosed by the invention is used for detecting refrigerant leakage, the detection result is not affected by an actual installing condition; the influence on the environment temperature can be eliminated, so that the extent of refrigerant deficiency in the air conditioning system can be accurately judged, and the detection result is more reliable. The invention further discloses the air conditioning system.

The invention relates to the technical field of micro mechanical electronics, in particular to a resonance micro accelerometer with high sensitivity, which solves the problem that the measuring sensitivity of traditional resonance accelerometers based on stress change is easy to be affected by interior residual stress and other factors. The accelerometer comprises a glass substrate, a mass block, two DETF resonators and a sensitive capacitor. The resonators are arranged in parallel/row and opposite to the side of the sensitive capacitor. The sensitive capacitor comprises a plurality of plate capacitors, polar plates at one side of which are fixed to the tuning forks by an articulated beam and polar plates at the other side of which are fixed by a supporting and connecting beam; the mass block is arranged between the two resonators, and a pair of symmetrical micro levers are arranged between the mass block and the two resonators respectively; the micro levers at the two sides of the mass block are symmetrical corresponding to the mass block, and one end of the micro level is fixed on the mass block and the other end on the supporting and connecting beam of the plate capacitor. The accelerometer of the invention has the advantages of reasonable structure, low volume, high sensitivity, good detecting effect and good development prospect.

A light source sequentially emits lights generated by at least three light emitting elements each emitting a different primary color to generate an image. Each light emitting element has a duty cycle in a lighting period, which may be an image frame period. A sequence scheme is provided for alternatingly driving different ones of the light emitting elements. The light emitting elements are driven in accordance with the sequence scheme at least two times in the lighting period, while maintaining the duty cycle for each light emitting element. In the sequence scheme, at least one light emitting element having the highest temperature sensitivity of all light emitting elements is driven more times than another one.

The invention discloses a water cooling balance which comprises a rod-type balance and a water-cooled jacket. Two water flow pipelines are arranged in the rod-type balance. The two ends of each water flow pipeline are arranged on the two end faces of the rod-type balance respectively. A switching joint is arranged between the water-cooled jacket and the rod-type balance and fixed to one end face of the rod-type balance through a screw. A water inlet switching pipeline and a water outlet switching pipeline are arranged on the switching joint. One end of the water inlet switching pipeline and one end of the water outlet switching pipeline correspond to openings of the two water flow pipelines on the end faces of the rod-type balance in position and the other end of the water inlet switching pipeline and the other end of the water outlet switching pipeline correspond to a water inlet and a water outlet of the water-cooled jacket in position. The defects that a corrugated pipe type water cooling balance is large in drag measurement error and inconvenient to install and use and a corrugated pipe is prone to being damaged and leaking water are overcome. In addition, due to the fact that corrugated pipe related devices are omitted, the length of the balance is reduced, the diameter of the balance is increased, the rigidity and the cooling effect of the balance are greatly improved, the temperature effect is reduced, and measurement uncertainty is obviously reduced.

A water and/or space heater is provided in which water is circulated to prevent the localized overheating or vaporization thereof.

The invention discloses a print control method of a thermal printer. The thermal printer is charged through a rechargeable battery. The print control method of the thermal printer includes steps: obtaining temperature of a core of the thermal printer through a temperature sensor before executing printing; obtaining a singe heat count corresponding to the temperature of the core of the thermal printer according to a pre-stored temperature and single heat time count relationship list; controlling the thermal printer to perform the printing according to the obtained singe heat count. The print control method of the thermal printer effectively improves print effects of the thermal printer under low temperature. The invention further discloses a print control device of the thermal printer.

An optical transceiver module includes a plurality of optical signal transmission/receiving units to receive and transmit optical signals, and is fastened to a base by a fastening unit. Each optical signal transmission/receiving unit includes a heat sink to promote heat dissipation efficiency. An electromagnetic shielding part covers the optical receiver to isolate from electromagnetic interference. A guiding plate is provided in the module to comb terminals of the module when the low-density wavelength-multiplex transceiver module is to be placed in an electronic device.

An underground porosity water storage reservoir minimizes the impacts on surface uses of the reservoir site. Furthermore, a method of operating an underground porosity storage reservoir minimizes damage to the reservoir due to injecting sediment-laden water or water that is chemically incompatible with the porous material in the underground reservoir. The underground porosity water storage reservoir reduces temperature impacts on surface waters due to the discharge of stored water. A method of using the porosity storage reservoir to minimize adverse temperature impacts when discharging water to a surface body is disclosed.

An on line test method and test system of differential type temperature-compensating bridge rope force based on the magnetoelasticity is disclosed. The bridge rope is the ferromagnetic material and placed in the specific magnetic field, the bridge rope will be magnetized; the magnetic conductivity of bridge rope will change with the variety of stress condition and temperature. The sensor comprises operating magnetic circuit and reference magnetic circuit, in every designing of the magnetic circuit, the bridge rope is just a part of the magnetic circuit and not as the iron core of the actuating coil and the measuring coil. The reference magnetic circuit of sensor just feels the changes of temperature, but the operating magnetic circuit feels the changes of temperature and rope force, the output signal of the operating magnetic circuit and the reference magnetic circuit is differential to eliminate the temperature effect, the value of rope force can be tested with the corresponding relationship between the change of magnetic conductivity and rope force. The test method of rope force in the invention characterized in high accuracy, well dynamic response, low price of sensor, convenience of mounting and conditioning, long service life, strong overcurrent protection power, fitting for static and dynamic measurement, sampling just in time in all-weather, the testing results are free of effects of anticorrosive coating and protective plastic casing which is in surface of bridge.

The present invention relates to a method for monitoring the deformation of a tunnel pipe-roof. The method includes the steps of (1) distributed optical fiber strain sensors laying: attaching distributed optical fiber strain sensors to the upper and lower ends of a steel cage, pushing the steel cage into a steel pipe to be measured, and filling cement mortar in the steel pipe to form a joint force bearing deformable body, (2) Data collection: selecting n measurement sections from the steel pipe to be measured with the measurement section distance being delta xi, monitoring vertical deformation of each section under the effect of vertical loads on a real-time basis by a data acquisition instrument and transmitting the vertical deformation to a monitoring host, and (3) deformation calculation and stability judgment: the monitoring host using Brillouin mediation technology and material mechanics theory to calculate the longitudinal strain difference of each cross section and obtain the deflection wi of the steel pipe to be measured. The monitoring method is quick and easy, the monitoring data is high in precision, and temperature is self-compensating. Monitoring equipment is connected with a data acquisition instrument, through which data is transmitted to a monitoring host, to realize real-time on-line monitoring of the pipe-roof deformation.

A modulized heat-dissipation control method for a datacenter is provided. In this method, a temperature sensor is used to sense inner temperatures of multiple servers and CPU temperatures in the multiple servers. If any one of the CPU temperatures is abnormal, a flow of a first coolant is adjusted. If any one of the inner temperatures is abnormal, a rotating speed of a fan module is adjusted. If the rotating speed of the fan module has reached its maximum, a flow of a second coolant is adjusted.

Abstract of Disclosure An apparatus and circuit for monitoring the closed position of a fuel cap relative to a tank connection pipe . The fuel cap has a ratchet torque limiter for controlling the tightening of the fuel cap to the tank connection pipe. A magnet is connected to the fuel cap and a magnetic switch, such as a reed switch, is connected to the tank connection pipe or proximal thereto. The movement of the magnet relative to the magnetic switch, indicating a locked fuel cap condition, is sensed by an abrupt change in magnetic field strength of the magnet. When releasing members snap over the cams therein, a current pulse is induced in a pickup coil . This current pulse is sensed and a logic level high voltage is produced corresponding to a tightened fuel cap condition. A dashboard lamp is then extinguished indicated that the fuel cap is safely and securely tightened.

A cascode current mirror circuit and a bandgap circuit are provided. The circuits are used together and function as a reference voltage circuit. The reference voltage circuit outputs a reference current resistant to temperature variation and ripple-voltage. Accordingly, a voltage stabilizing/regulating circuit corrects error voltage precisely and promptly, and the resultant voltage is temperature insensitive and ripple-voltage-independent.

The invention relates to an atomic spin procession detecting method and an atomic spin precession detecting device based on electro-optic modulation. Alkali metal atoms in a spin-exchange relaxation free state are used for sensing an external magnetic field or angular rate, thereby generating atomic spin Larmor precession. An electro-optic modulator is used for performing electro-optic modulation on detected laser. Through output light strength detection by the electro-optic modulator and demodulation of a phase-locked amplifier, output light strength and frequency doubling signal strength are obtained. Finally a signal acquisition and processing circuit measures an atomic spin precession signal, and furthermore measurement to the external magnetic field or inertia can be realized. According to the atomic spin procession detecting method and the atomic spin procession detecting device, advantages such as simple modulation, small size, high sensitivity, low temperature effect and simple operation condition in the electro-optic modulator are exerted. The atomic spin procession detecting method and the atomic spin procession detecting device have relatively high sensitivity and relatively high stability. The novel atomic spin procession detecting method is based on an atomic spin effect and can be used for industrial integration and practical application of atomic spin sensing devices in future.

The invention discloses a design method of an electrostatic negative stiffness accelerometer. The method is characterized by comprising the steps that S1, an interface electromechanical model of the electrostatic negative stiffness accelerometer is established, and the interface electromechanical model is converted into a coordinate system equation; S2, by calculating electrostatic force of a combtooth capacitor, the position length and symmetric design of a driver and driven detection comb teeth are determined; S3, according to the electrostatic force feedback principle, planning design is performed on the size and spacing of embedded detection comb tooth electrodes; and S4, according to the principle of the acceleration and electrostatic negative stiffness effect in the accelerometer based on electrostatic negative stiffness regulation, a relational expression influencing acceleration finally is obtained. The design method of the high-performance FM accelerometer based on electrostatic negative stiffness regulation is good in use effect and has quite high application and popularization value.

The invention provides a mechanical-bearing supported small asymmetrical reentry body aerodynamic force measuring apparatus. The measuring apparatus is implemented through a measuring method using nested combination of inner and outer balances, wherein the inner balance selects a normal rod type 6-component balance structure; the outer balance selects a hollow radial structure; and the inner and outer balances are connected through a mechanical bearing with smaller rolling frictional damping. The measuring apparatus includes a tail support rod, a mechanical-bearing support device, a back segment of a model, and a front segment of a model, wherein the tail support rod is fixedly connected with the mechanical-bearing support device and a model mechanism; the mechanical-bearing support device is connected with the back segment of a model; and the back segment of a model is in threaded connection with the front segment of a model. The aerodynamic force measuring apparatus has the advantages of being simple in structure, being small in volume and being high in rigidity, can distribute different measuring components on the inner and outer balances according to the coupling feature of the measuring load and the balance structure constrained condition, is suitable for a hypersonic wind tunnel test for small asymmetrical reentry body aerodynamic force measurement, and is especially able to control the measuring interference of other large load components on a small roller torque to improve the measuring accuracy.

The invention provides a three-dimensional touch panel. The three-dimensional touch panel comprises an insulation dielectric layer, a touch electrode layer and a pressure-sensitive electrode layer, wherein the touch electrode layer and the pressure-sensitive electrode layer are respectively positioned at two opposite sides of the insulation dielectric layer; the touch electrode layer comprises multiple sets of insulated and staggered touch electrodes and is used for detecting the position of a touch signal; the pressure-sensitive electrode layer comprises at least one pressure-sensitive electrode correspondingly arranged with at least one part of the touch electrodes and is used for detecting the pressure of the touch signal; the touch electrode correspondingly arranged with the pressure-sensitive electrode is also used for performing temperature compensation of the pressure-sensitive electrode; and the temperature compensation manner includes a positive and negative temperature coefficient material series manner, a value reduction manner and a Wheatstone bridge manner. The three-dimensional touch panel provided by the invention has the advantages of being high in detection precision, light, thin and the like.

An image forming apparatus includes an image forming unit configured to form a measurement image on a recording paper, a fixing unit configured to fix the measurement image onto the recording paper by heating, a measurement unit configured to measure the measurement image fixed on the recording paper downstream of the fixing unit in a conveyance direction of the recording paper, and a correction unit configured to correct a measurement value output from the measurement unit such that an effect of temperature of the recording paper is decreased when the measurement unit measures the measurement image. The correction unit is configured not to correct the measurement value in a case where density of the measurement image is measured by the measurement unit, and the correction unit is configured to correct the measurement value in a case where chromaticity of the measurement image is measured by the measurement unit.

The invention discloses a micro control unit (MCU) built-in reference temperature compensation method based on a system on chip (SOC) electric meter. The method comprises the following steps of: measuring relation data of a built-in reference and temperature as well as of a built-in error and the temperature, calculating a corresponding relation of a required fine adjustment factor for correcting the built-in reference and the temperature, storing relevant data points, and constructing a compensation data sheet for lookup; regularly reading on-chip temperature by using an on-chip temperature sensor of the MCU, and calculating a built-in reference fine adjustment factor at the temperature by adopting a method combined with lookup and interpolation; and setting a value of a built-in reference digital adjustment register according to the fine adjustment factor, and compensating the fluctuation of the built-in reference, which is caused by change of the temperature. According to the method, the influence of a temperature effect on reference voltage, an analog/digital (A/D) conversion result and the electric energy measurement precision is avoided, the subsequent temperature compensation processing loop is simplified, the operability is high, the cost is low, and the stability is high; and the method can be widely applied to the field of electric energy metering based on an embedded SOC scheme.

The invention discloses a high-precision zero-length spring temperature drift and long-term creep deformation detector and relates to a performance detection technology of a geoscience apparatus core component. A structure of the detector is mainly characterized in that a zero setting mechanism is formed by a manual gear, a spiral drum and an elevating screw; the manual gear and the spiral drum form up and down connection and the elevating screw is arranged in the spiral drum; a top center hole of a spring shielding cylinder is provided with the spiral drum; in the spring shielding cylinder, from top to bottom, the elevating screw, an upper filament connection seat, an upper spring hang spring, a zero-length spring, a lower spring hang spring, a lower filament connection seat and a capacitance moving sheet are successively connected; in an up and down space of the capacitance moving sheet, first and second stator plate fixing columns are arranged on an inner wall of a support cylinder respectively, and upper and lower capacitance stator plates are connected to the first and second stator plate fixing columns respectively; an electronic system is connected to the capacitance moving sheet, the upper and lower capacitance stator plates and a constant temperature cylinder respectively. Measurement precision is high, a resolution ratio and a temperature are adjustable. The detector is suitable for zero-length spring temperature drift and long-term creep deformation detection.

Constant and accurate signal gain systems based on controlling oscillator loop gain. A constant gain positive feedback network and an amplifier form an oscillator. Only when the oscillator loop gain is at least one does the oscillator produces an AC signal. Negative feedback of the oscillator's AC signal level is used to keep the loop gain close to or at the value of one by controlling the loop gain of the oscillator circuit. By maintaining the loop gain of the oscillator circuit substantially constant the signal gain is also maintained substantially constant.

The invention provides a high-sensitivity capacitive-type pressure sensor and a manufacturing method therefor. The sensor comprises a substrate (1), a pressure elastic film (2), a first fixed base (31), a second fixed base (32), a third fixed base (33), a mechanical rod (4), a supporting shaft (5), a first interdigital electrode (61), a second interdigital electrode (62), a first lead electrode (71), a second lead electrode (72), and an insulating material (8), wherein the first, second and third fixed bases are fixed on a substrate (1), and the substrate (1) is provided with the pressure elastic film (2). The central upper surface of the pressure elastic film (2) is connected with one end of the first fixed base (31) through the insulating material (8). Meanwhile, the other end of the first fixed base (31) is connected with one end of the mechanical rod (4). According to the invention, the deformation of the pressure elastic film (2) can be amplified in a multiplied manner, thereby improving the capacitor detection sensitivity.

To provide a surface property inspection apparatus, surface property inspection system, and surface property inspection method capable of inspecting the surface processing state of processed material subjected to surface processing such as shot-peening, heat treatment, or nitriding with high accuracy and low vulnerability to temperature changes in the inspection environment. Surface property inspection apparatus is furnished with a AC power supply, a AC bridge circuit, and an evaluation device; AC bridge circuit comprises variable resistor with which distribution ratio γ is variable, reference detector, and inspection detector. Inspection detector is furnished with a coil wound so as to oppose the surface property inspection region of object under inspection M, and by supplying AC power from AC power supply to coil, an eddy current is excited in object under inspection M. Thus the magnetic properties of object under inspection M can be detected, and inspection of surface properties based on the output signal from AC power supply is possible.

The invention provides a sensitivity-enhanced optical time domain reflection distributed Michelson interferometer based on a two-core optical fiber, which can be used for distributed optical fiber sensing and measuring. The system is composed of a light source (1), a three-port optical fiber circulator (2), a 2*2 optical fiber coupler (3), a two-core optical fiber (4), a photoelectric detector (6), a photoelectric detector (7) and a differential signal amplifying and processing circuit (8). In the system, optical time domain reflection is used for realizing distributed measurement; interference characteristics can realize tiny disturbance measurement; the differential signal detection characteristics can offset the average signal intensity to enable the interference signals to be multiplied; the two fiber cores are located in the same optical fiber, changes of environmental temperature are the same, and influences of the temperature can be eliminated; and as the two fiber cores are symmetrically distributed outside the axis, transverse disturbance enables mechanical transformation with amplifying differential to be formed between the two fiber cores, and the system sensitivity is enhanced. Thus, the use of the two-core optical fiber can greatly enhance the ability of response to tiny vibration signals.