7results about How to "Increased measurement bandwidth" patented technology

The application discloses a kind of absolute gravimeter device and method based on transparent medium microsphere free falling in optical standing wave.The application uses laser to build standing wave optical path along vertical direction, wherein standing wave one end beam is incident to light intensity detector.Then transparent medium microsphere is suspended in potential well, and microsphere is free falling in standing wave when potential well is closed.Light intensity detector receives periodic variation signal when microsphere repeatedly passes through wave node position, thereby real-time measurement microsphere displacement, and the acceleration value of falling is calculated, then potential well is opened to pull microsphere up to original release point and repeat falling.Compared with prism falling body in traditional gravimeter, microsphere falling body in the application is pulled back to release point in short time, and measurement bandwidth is high.There is no collision loss in deceleration process, and measurement life is long.Microsphere can be mass-produced, and volume is small and processing difficulty is relatively low.In short, the application provides a kind of absolute gravimeter method and device with high measurement bandwidth, miniaturization and low cost.

This invention relates to the field of in-situ impedance testing technology for energy storage batteries. To address the current difficulties in achieving rapid tracking of wideband excitation signals and the inaccurate identification and measurement of electrochemical parameters, it provides a battery in-situ impedance testing method and system based on adaptive phase compensation. The method includes acquiring the initial reference current and actual sampled current of the battery charging and testing system; iteratively calculating the real-time phase lag angle and generating a corrected reference current command accordingly; predicting the current response in two steps based on a discrete mathematical model of the full-bridge converter in continuous conduction mode; and optimizing the switching state corresponding to the voltage vector that minimizes the composite cost function to drive the switching transistors of the full-bridge converter. This method balances fast dynamic response with zero phase error tracking, meeting the high-precision requirements of in-situ EIS testing of energy storage batteries.

The present invention discloses a microwave photon radar detection and frequency measurement method and its integrated device. It includes: converting an adjustable optical signal into a linear swept frequency electrical signal; using a first distributor to divide the linear swept frequency electrical signal into a test signal; using a second distributor to divide the test signal into a reference signal and a detection signal; using the detection signal to detect, and obtaining an echo signal after being reflected by a target object; inputting the reference signal, the test signal and the echo signal into a dual-polarization dual-drive Mach-Zehnder modulator for processing, and outputting a first polarization signal and a second polarization signal; and then processing to obtain the position information and frequency of the target object. When the present invention is used to measure frequency, an adjustable optical signal is used to change the range of the swept frequency signal and the frequency measurement range. Only one dual-polarization dual-drive Mach-Zehnder modulator is used to simultaneously perform radar detection and frequency measurement. When the present invention is used for radar identification, no additional radio frequency source is required, and it has super flexible adjustability.

According to the vector magnetic field measurement method based on the self-excited cesium optical pump magnetometer, a regression equation set of each component of the magnetic field vector to be measured does not need to be constructed by a time sequence of multiple measurements, then the magnetic field vector is calculated, and the method has the technical characteristics of dynamic continuous measurement and large measurement bandwidth. A circular rotating modulation magnetic field is generated in an x-y plane through two paths of sinusoidal signals with the difference of pi / 2 provided by a signal source, two pairs of compensation coils can provide a uniform bias compensation magnetic field in the x-y plane, and a self-excited cesium optical pump magnetometer serves as a sensing unit and is placed in the geometric center of the device. A frequency meter outputs a digital signal of the total magnetic field size, the digital signal is converted into an analog signal through a DAC and then is input into lock amplifiers, two lock amplifiers LIAx and LIAy demodulate measurement signals of the optical pump magnetometer through two paths of modulation reference signals generated by a signal source respectively, after error signals are obtained, output of a current source x and output of a current source y are controlled through two PID, and the optical pump magnetometer is controlled through a current source. And the magnetic field components in x and y directions are measured through closed-loop locking.

The invention discloses a method and a system for designing and optimizing an anti-interference common-mode filter of an infrared sensor. The method comprises the steps of winding a Rogowski coil, calculating a relation between output voltage and a current change rate, and calculating parameters of the Rogowski coil. Calculating the relation between the integrating circuit output voltage and the common-mode current, and setting integrating circuit parameters. And setting in-phase amplifier parameters to obtain a common-mode transformer circuit transfer function. Common-mode transformer circuit parameters are designed, and the winding turn ratio is calculated. According to the infrared sensor anti-interference common-mode filter design and optimization method and system provided by the invention, by optimizing the Rogowski coil and the integral circuit design, external common-mode interference signals are effectively filtered out, and accurate transmission of the signals is ensured. A parameterization design method is adopted, the circuit design and adjustment process is simplified, and scientific researchers can conduct experiments and optimization more conveniently. By optimizing the high-frequency band design, the resonance phenomenon is avoided, the measurement bandwidth of the Rogowski coil is remarkably expanded, and the application range of the system is widened.

The application provides a broadband light vector measurement method and device based on I / Q demodulation, which comprises the following steps: generating carrier-suppressed double-sideband linear frequency modulation light signals with fixed starting frequency difference as a measurement signal and a local oscillator signal respectively; passing the measurement signal through a light device to be measured to obtain a probe light signal; coherently mixing the probe light signal and the local oscillator signal through a 90-degree optical mixer, extracting I / Q two-way electrical signals through a balanced photodetector; constructing a complex signal to separate upper and lower sidebands and suppress mirror frequency interference, extracting fixed low-frequency components to obtain spectrum response information of the light device to be measured; obtaining the system's own spectrum response through a calibration process; eliminating the system response through complex division operation to obtain the amplitude response and phase response of the light device to be measured. The application can solve the spectrum aliasing problem in symmetrical double-sideband modulation without increasing the complexity of the system, expand the measurement bandwidth by one time, speed up the measurement, and does not need a wideband electrical amplitude and phase detector, effectively reducing the measurement cost.

The invention discloses a semiconductor quantum dot measurement method, a measurement and control system and a quantum computer. The method comprises the following steps: adjusting an impedance matching circuit in a measurement link to enable the impedance of an induction quantum dot to be matched with the characteristic impedance of the measurement link; applying a first direct-current voltage signal, a first radio frequency reading signal and a second direct-current voltage signal to the grid electrode of the induction quantum dot to obtain a coulomb peak phase diagram of the induction quantum dot; determining a first target voltage of the first direct-current voltage signal and a second target voltage of the second direct-current voltage signal according to a change value of a reflection voltage in the coulomb peak phase diagram; and applying a second direct-current voltage signal to the grid electrode of the bit quantum dot, and respectively applying a first direct-current voltage signal of which the voltage value is the first target voltage, a second direct-current voltage signal of which the voltage value is the second target voltage and a first radio frequency reading signal to the grid electrode of the sensing quantum dot to read information of the sensing quantum dot. According to the invention, the measurement efficiency of the semiconductor quantum chip is improved.