39results about How to "Eliminate zero drift" patented technology

The present invention provides a pulse condition detection device. It includes sensor input module, data acquisition processing module and auxiliary function module. It also includes a analog signal regulation module. Said analog signal regulation module is used for regulating the analog signal obtained from sensor input module and making it be converted into the signal suitable to making A/D conversion, and extracting DC component for detecting pulse-feeling pressure from the described analog signal. The above-mentioned sensor input module and analog signal regulation module can implement bidirectional data connection, and said data acquisition module is connected with said analog signal regulation module and auxiliary function module. Said invention can effectively make pulse condition signal acquisition.

The invention discloses improved skip weight-fixed loading equipment, which belongs to the technical field of weighing. A sector gate is mounted at an discharge port of a weight-fixing hopper; a weighing sensor is mounted at the bottom of the weight-fixing hopper; an sector gate oil cylinder is welded on the side wall of the weight-fixing hopper; the sector gate is connected with the sector gate oil cylinder; a coal level meter is mounted in a surge bunker; the discharge port of the surge bunker is positioned at the bottom of the bunker; a flat gate is mounted at the discharge port and is connected with a flat gate oil cylinder; the surge bunker is positioned right above the weight-fixing hopper; counterweight lifting oil cylinders are mounted below the two side walls of the weight-fixing hopper respectively; the oil paths of the flat gate oil cylinder, the counterweight lifting oil cylinders and the sector gate oil cylinder are connected with a hydraulic pump station; the coal lever meter, the weighing sensor, a belt conveyor and the hydraulic pump station are electrically connected with a controller in a lifting control chamber. The improved skip weight-fixed loading equipment has the advantages of high coal loading precision, strong reliability, avoidance of frequent exchange of the weighing sensor and reduction in maintenance cost.

The invention relates to a method for eliminating zero drift of an electronic sphygmomanometer and a device adopting the method. The method comprises the following steps: firstly controlling by using a valve before the electronic sphygmomanometer starts to measure every time, disconnecting a pressure sensor air passage and a sleeve strap air passage, communicating with atmosphere, taking an obtained pressure signal as a pressure signal corresponding to zero pressure and taking the pressure signal as a zero pressure reference value to conserve; disconnecting the sensor air passage and the atmosphere and communicating with the sleeve strap air passage to carry out blood pressure measurement; after blood pressure measurement data is obtained by the electronic sphygmomanometer, correcting a pressure signal value obtained by every measurement by means of the conserved zero pressure reference value and carrying out blood pressure calculation and display through taking the data after being calculated and corrected as measuring results. The invention not only can better eliminate the pressure reading error caused by the zero drift of the electronic sphygmomanometer in the blood pressure measurement process of the electronic sphygmomanometer and improve the human body blood pressure measurement accuracy, but also can be used for other technical fields for eliminating the zero drift by applying a pressure sensor.

The invention provides a digital three-way displacement measuring device for expansion monitoring of thermal equipment, which consists of a three-way reflector composed of three mutually perpendicular plates fixed on the object to be monitored, and a three-way laser fixed on a relatively static point. Composed of ranging sensors and soft dust-proof shields, it realizes the digitalization and precision of the detection process. The detection process is basically not affected by changes in environmental factors. The measurement accuracy is high and the data is stable and reliable. There is no zero drift problem in long-term operation; A method for controlling errors during on-site installation.

The invention provides an intelligent data acquisition and monitoring module of a pre-installed electric house which adopts a CMOS (Complementary Metal-Oxide-Semiconductor Transistor) multi-path electronic switch to switch a multi-channel signal input and shares a set of signal conversion, isolation, amplification, A/D (Analog to Digital) conversion and processing circuit, therefore, a data acquisition module structure can be greatly simplified; the device is capable of receiving a plurality of test signal resources, and simultaneously realizing complete isolation between a signal end and an amplifier, therefore, the device is good in isolation effect and high in signal transmission precision; furthermore, by adopting a moment gain K as the magnification times of processing transmission signals, the drift of an amplification circuit can be effectively eliminated due to the temperature influence; in addition, the precision of the amplified signal is higher by automatically selecting a measuring range. The intelligent data acquisition and monitoring module provided by the invention is complete in function, convenient and flexible to operate and precise in test signal, and is capable of implementing the functions of long-range wireless monitoring and management.

The invention provides a method and a system for detecting the concentration of trace gas on an open optical path based on a spectral absorption principle. The system is provided with a PCB control circuit, a laser emitter and a photoelectric detector, wherein the laser emitter and the photoelectric detector are respectively connected with the PCB control circuit; wherein the PCB control circuit comprises an MCU module, an amplifying and filtering module, a phase shift and phase sensitive detection module, an ADC sampling module and a self-calibration module, a collimating lens is arranged between the laser emitter and detected gas, an aspherical mirror is arranged between the photoelectric detector and the detected gas, the aspherical mirror gathers reflected laser to the photoelectric detector, the photoelectric detector is used for measuring reflected light power. The technical problems that an existing laser detection method cannot avoid interference of environmental noise, circuits and algorithms are complex, and cost is high are solved. The method and the system can be widely applied to gas concentration detection.

The invention belongs to the technical field of isolation amplifier circuits, and particularly relates to a programmable gain isolation amplifier circuit and an implement method thereof. The programmable gain isolation amplifier circuit comprises an isolation unit U1 and a programmable gain amplifier circuit, wherein the isolation unit U1 comprises an input end, a conversion capacitor, a micro-electronic digital single-pole double-throw switch, gating signals, and control signals of the micro-electronic digital switch, and the programmable gain amplifier circuit comprises a precise integrated operational amplifier, a programmable resistor network and a gain measuring circuit. The programmable resistor network is composed of digital potentiometers, and the gain measuring circuit comprises a digital switch, standard voltage and the control signals of the digital switch. The programmable gain isolation amplifier circuit can achieve complete isolation between a signal end and the amplifier, can overcome the zero-shift phenomenon of the amplifier circuit, is strong in continuity of gain selection, and can remarkably improve amplification precision.

The invention relates to a method for identifying a capital English letter automatically based on fixed strokes of a mobile phone, which comprises an estimation method of a mobile phone movement track and a matching identification method of the fixed strokes. The method is used for inputting capital English letters and a space key; a user can input the capital English letters in the space through the estimation method of the mobile phone movement track and the matching identification method of the fixed strokes and by using a three-axis acceleration sensor mounted in the mobile phone. The method is applicable for a user with a relatively low visual ability or a circumstance in which a mobile phone keyboard or a touch screen is inconvenient to use; meanwhile, according to the method, a three-axis sensor is corrected, and null shift and gravity are removed, so that the calculation of the mobile phone movement track is more accurate, correct input is accordingly obtained, and the user can write in the space for inputting as using a pen.

The invention discloses a signal processing circuit and method. The circuit comprises a signal source which is used for providing a source signal; an amplifier which is connected with the signal source and amplifies the source signal; a zero-setting circuit which is connected with the amplifier and is used for compensating the amplified signal; an analog-digital converter which is connected with the amplifier and the zero-setting circuit, and converts the compensated circuit into a digital signal; and a digital signal processor which is connected with the analog-digital converter and is used for carrying out the operation processing of the digital signal. The zero-setting circuit is connected to the output end of the amplifier, and the output end of the amplifier provides a compensation current, thereby inhibiting the zero drift of the signal source and the zero drift of the amplifier. The signal processing circuit inhibits the zero drift of a plurality of circuit modules through the zero-setting circuit which is connected with the output end of the amplifier.

The invention relates to a time-division driving and orthogonal force feedback closed-loop quartz gyroscope error suppression method and belongs to the technical field of micromechanical inertial devices. The method comprises the following steps that 1) a drive software unit and a drive module output time-division sine drive excitation signals, and alternately output the sine drive excitation signals and zero level signals in adjacent time periods; 2) when the driving excitation signal is in a signal-free period, a detection module starts to perform signal detection to obtain an in-phase component and an orthogonal component of a detection signal; (3) in-phase and orthogonal signal PI closed-loop control is established, in-phase and orthogonal force feedback closed-loop signals are generated respectively, and force feedback closed-loop signals are generated through digital-to-analog conversion; and 4) a force feedback signal is loaded to a detection end of a quartz tuning fork for force feedback closed-loop control so that displacement of the detection end of the quartz tuning fork is zero. According to the method, an electrostatic coupling error and a mechanical coupling error of the gyroscope are suppressed, the zero drift of the gyroscope is effectively improved, and the circuit is easy to implement.

An armrest handle apparatus with a zero point switch comprises a left side handle, a right side handle, a left side plectrum, a right side plectrum, a potentiometer, a double-zero switch, a fixing shifting fork and a rotation shifting fork, wherein the left side handle and the right side handle are fixedly connected to a pedestal; the left side plectrum pivoted to the left side handle, the a right side plectrum pivoted to the right side handle; the potentiometer, the double-zero switch and the fixing shifting fork are installed on the pedestal; and the rotation shifting fork is connected to the left side plectrum and the right side plectrum. The fixing shifting fork and the rotation shifting fork are connected through a reset torsion spring. According to the above scheme, the apparatus integrates advance and retreat, and turning functions, the structure is compact and operation is convenient; an operator holds the left side handle or/and the right side handle, a thumb stirs the plectrums so as to drive a rotating shaft of the potentiometer to rotate; and the potentiometer sends a control signal to equipment so as to complete forward and backward motion; during turning, the operator only needs to hold an index finger or a middle finger so that turning motion can be completed, which is convenient and fast; and operation is convenient.

The invention discloses an electrophysiological catheter with a pressure sensing function. By the electrophysiological catheter, temperatures can be compensated according to temperature changes in theapplication, zero temperature drifts of contact pressure measurements can be remarkably eliminated, measuring errors can be reduced, the stability of the contact pressure measurements can be improved, and the production cost of the electrophysiological catheter can be reduced. The electrophysiological catheter comprises a head electrode, a second electrode, a pressure sensor, a catheter body, a handle, a connector and an internal circuit board. The head electrode, the second electrode and the pressure sensor are sequentially arranged at the front end of the catheter body. The catheter body isinserted into the human body from the outside, and the rear end of the catheter body is connected with the handle to facilitate holding. The connector is arranged at the tail end of the handle, and is constructed as a data and power combined interface to be connected with a radio frequency energy source, a power source and a data transmission interface. The internal circuit board is arranged in the handle, is provided with a pressure detecting circuit to receive signals of the pressure sensor, and is also provided with a micro processing unit to acquire pressure data according to the signalsof the pressure sensor.

The invention relates to a stable cannon control method based on image compensation. A CCD camera (2) is mounted on a cannon firepower mechanical mechanism (1) coaxial with a firepower line, and a collected visual-field image is the visual-field image of the present aiming direction of the power line; an image collection processing unit (3) obtains present visual-field images from the CCD camera (2) periodically, calculates a position vector P of a target position point (8) deviated from the central point (7) of the firepower line, and decomposes the position vector P into a deviation angle position alpha of the azimuth and a deviation angle position beta of the elevation direction of a cannon; and a cannon position servo unit (4) drives a cannon azimuth-drive motor (5) and an elevating execution motor set (6) to operate according to angular deviations, and drives the cannon firepower mechanism to rotate so that the central point of the firepower line moves to a target position point till the central point is coincided with the target point, and stable control is completed.

The invention provides a measuring device for measuring oil vapor or other hydrocarbon contents in a gas and a measuring method. The measuring device comprises a PID sensor, and a first gas line and asecond gas line in parallel connection with the PID sensor, wherein one end of each of the first gas line and the second gas line is connected to a sampling gas inlet, and the other end of each is operatively connected to the gas inlet of the PID sensor; the first gas line and the second gas line are provided with a first valve and a second valve for selective switching along a gas flow directionrespectively; a zero point calibration filter is arranged at the downstream of the second valve along the gas flow direction on the second gas line; and the zero point calibration filter is used forfiltering and removing oil vapor or other hydrocarbon in the gas. The device can provide convenient, reliable and flexible operation and calibration, and accurate measurement and measurement error correction can be realized easily.