30results about How to "Realize self-calibration function" patented technology

The invention discloses a radio frequency signal generation and radio frequency power detection device, comprising: a radio frequency signal generation unit, used to generate a radio frequency signal with required frequency and power; a radio frequency signal power detection unit, used to receive the radio frequency signal generated by the radio frequency signal generation unit RF signal or external input RF signal, and power detection; RF signal path switching control unit, used to control the on-off of the input / output port and the switching of the RF signal generation unit and the RF signal power detection unit; the control unit, used The interface unit is used to receive commands to control the radio frequency signal generation unit and the radio frequency signal power detection unit; and the input / output port is used to output / output radio frequency signals. By using the invention, low-cost, high-flexibility and high-precision power detection can be realized, and at the same time, the self-calibration function can be realized to obtain high-precision radio frequency signal output.

The invention relates to a self-calibration method for realizing an optical voltage sensor, which relates to a self-calibration method for a sensor. A reference voltage source is designed to realize a self-calibration function of the optical voltage sensor. By using the current optical voltage sensor, measurement precision and temperature stability are low. By using the optical voltage sensor of the invention, the above problem can be solved. In the invention, a discrete Fourier algorithm is used to acquire an effective value of a voltage signal. Through adding a calculation sample number and windowing processing, influence of frequency fluctuation on effective value calculation can be reduced and the stability of a self-calibration coefficient can be increased. An optical voltage sensor measurement result is affected by a temperature. By using an optical current sensor in the invention, the above problem can be solved. Through testing, the measurement precision reaches an IEC 0.2 grade measuring requirement in a temperature scope of minus 40-60 DEG C. The sensor and the method are suitable for designing a voltage transformer.

The invention discloses a control driving system for a universal rack, which can realize stable and reliable rack rotation control and high control precision. A photoelectric encoder and a potentiometer are arranged on the rack and a motor respectively, two measurement angle values are calibrated through an angle calibration module, and thus, a self-calibration function is realized; in the case of automatic control, when the rack moves near a target angle, different operating frequencies are transmitted to a frequency converter according to the difference between the current angle and the target angle, the relationship between the angle difference and a motion speed can simulate a damped motion curve, the motion speed of the rack just reaches 0 when the rack moves to the target angle, and thus, zero overshoot control is realized, and the rotation precision is high; and through detecting the position of a treatment couch in real time through an automatic anti-collision control unit and an anti-collision and anti-over turning control module, collision between the rack and the treatment couch is automatically prevented.

The invention discloses an impeller detecting system and method for a range hood. The range hood comprises a motor, a volute and an air flue, wherein the volute is communicated with the air flue; an impeller is arranged inside the volute; and the motor is used for driving the impeller to rotate. The impeller detection system comprises a magnetic element, a magnetic field detection module and a range hood main control unit, wherein the magnetic element is arranged on the impeller; the magnetic field detection module and the range hood main control unit are arranged on the volute; the magnetic field detection module is used for detecting the magnetic field of the magnetic element in the rotation process of the impeller and used for forming corresponding pulse signals according to the detected magnetic field signals; and the range hood main control unit is used for detecting whether the impeller has eccentric abnormity or not according to amplitude change of the pulse signals, and used for detecting whether the air flue has load abnormity or not according to frequency change of the pulse signals. By adopting the scheme of the embodiment, the magnetic element is mounted on the impeller, the magnetic field detection module is arranged on the volute, impeller eccentric abnormity and air flue load abnormity can be rapidly and effectively detected, and real-time monitoring on impelleroperation properties and air flow properties can be achieved.

The invention discloses a grounding resistance monitoring instrument with self-checking and correction, which comprises a main circuit and a switching circuit connected with the main circuit, and the switching circuit is respectively connected to an external grounding network and a standard resistance. Add a high-precision standard resistance to the circuit board to simulate the ground network, and transfer the circuit that originally tested the external ground network to the standard resistance on the test board through the relay switching circuit. Fine-tuning is implemented inside the program, and the offset is added to the measured value to reach the normal value; if there is a large deviation between the measured value and the standard value, it means that there is a big problem with the equipment and needs to be returned to the factory for repair. Among them, the switching circuit structure is as follows: four double-pole double-throw relay switches are used. After adopting the present invention, technicians can remotely know the working status of the equipment, and can realize remote correction when the measurement data deviates.

The invention relates to the field of laser wavelength monitoring, and discloses a multichannel laser wavelength dependence monitor and a monitoring method. The multichannel laser wavelength dependence monitor is composed of a multi-optical-fiber collimator, an F-P etalon with adjustable cavity length and a photoelectric detector, and monitors and measures frequency differences between laser light sources in a scanning manner. Through the multiplexing of the F-P etalon by means of a multi-optical-fiber head and the tenability of the etalon, the multichannel laser wavelength dependence monitor realizes frequency difference monitoring and feedback of multiple laser devices, is simple in structure, can be used for monitoring multi-channel laser without modulating a DFB laser device, reduces channel interference, and plays a significant role in improving a signal-to-noise ratio of the system.

The invention relates to an orthogonal mismatch calibration method and device of a direct frequency conversion transmitter. The orthogonal mismatch calibration device comprises a first voltage comparator, a second voltage comparator, a first switching circuit, a second switching circuit, a digital state machine, a low-pass filter, a gain fine-tuning circuit and a phase fine-tuning circuit. The output end of a passive frequency mixer is connected with the input end of the low-pass filter, and the output end of the low-pass filter is connected with a first input end of the second voltage comparator. The gain error and the phase error between same-phase / orthogonal channels of the direct frequency conversion transmitter are measured with the orthogonal mismatch calibration method and device; the optimal calibration value is obtained through successive approximation, the self-calibration capacity of orthogonal mismatch of the direct frequency conversion transmitter can be improved, and dependency, complexity and power consumption of a calibration system are lowered.

The invention belongs to the field of image processing and computer vision, and relates to an infrared stereo camera dynamic external parameter calculation method based on histogram equalization. Because the imaging of the infrared camera is different from the imaging of the visible light camera, the number of point pairs which are obtained by directly extracting feature points for matching and meet requirements is small. In order to solve the problem, feature points of a left infrared camera and a right infrared camera are extracted and matched, and an original calibration result is correctedaccording to the feature points. Besides, in order to solve the problem of insufficient feature points, feature point extraction is carried out on an original image, and feature point extraction is also carried out on an infrared image after gray histogram equalization. According to the invention, the change of the position relationship of the infrared binocular camera caused by factors such as temperature, humidity and vibration is solved. The method has the advantages of high speed, accurate result, simple operation and the like.

The invention belongs to the technical field of wood processing equipment, and relates to a wood working machine platform. The platform comprises a support frame, and a feeding region, a discharging region and a processing region which are formed on the support frame, wherein the processing region is positioned between the feeding region and the discharging region; the feeding region comprises a 90-DEG V-shaped feeding slipway fixed on the support frame; a material loading conveyor belt is arranged on one side of the feeding slipway; the discharging region comprises a 90-DEG V-shaped discharging slipway fixed on the support frame; both the feeding slipway and the discharging slipway comprise a bottom plate and a side plate which have an inclined angle of 90 DEG; and the two bottom plates and the two side plates are positioned on the same surface respectively. The invention also provides a wood working machine using the platform. The platform and the machine can be self-calibrated, have a small occupied area and are suitable for processing square wood.