43 results about "Microwave power meter" patented technology

The invention provides a wireless signal tester calibration device and a method. A frequency meter is used for calibration of an output frequency of output signals of the wireless signal tester; a microwave power meter is used for calibration of output power of output signals of the wireless signal tester; a vector signal analyzer is used for EVM calibration of output signals of the wireless signal tester; a vector signal transmitter and the microwave power meter are used for calibration of power measurement of the wireless signal tester; the vector signal transmitter and the vector signal analyzer are used for calibration of EVM measurement of the wireless signal tester; and thus, reliability of performance test on the corresponding wireless transmitting and receiving equipment by using the wireless signal tester can be ensured. The invention also provides an automatic testing system and a method. The calibration device of the invention can be used for carrying out automatic calibration on the wireless signal tester, and the wireless signal tester after calibration is used for automatically testing to-be-tested wireless equipment.

The invention discloses a broadband microwave power meter and an interference signal filtering method. The power meter comprises an A / D conversion module, an FFT (fast Fourier transform) module, a power spectrum estimation module, a power spectrum integration module, an interference detection module and a digital filter module, wherein the A / D conversion module is used for carrying out A / D conversion for an intermediate-frequency input signal, the signal is converted to a digital signal from an analog signal; the FFT module is used for converting the digital signal to a frequency domain from a time domain; the power spectrum estimation module is used for carrying out power spectrum estimation for the frequency domain signal; the power spectrum integration module is used for accumulating the power spectrum to improve the signal to noise ratio of the power spectrum estimation; the interference detection module is used for identifying an interference signal; and the digital filter moduleis used for filtering the interference signal. According to the broadband microwave power meter disclosed by the invention, the interference signal entering the frequency band is automatically identified and filtered; and meanwhile, filter parameters are manually configured so as to ensure that a radio telescope can normally observe in the presence of stronger interference signals.

The invention discloses a device and a method for measuring the chirp parameter frequency response characteristics of an electro-optic intensity modulator, and relates to the technical fields of electronics. The device comprises a tunable laser, a polarization controller, a modulator for electro-optic intensity to be measured, a microwave signal source, a first optical connector, a second optical connector, a single mold optical fiber, an optical power meter, a photoelectric detector, a microwave power meter, a data collecting card and a computer, wherein the tunable laser, the polarization controller, the modulator for electro-optic intensity to be measured, the first optical connector, a dispersion optical fiber group, the second optical connector and the photoelectric detector are sequentially connected through optical paths, and the photoelectric detector, the microwave power meter, the data collecting card, the computer and the microwave signal source are sequentially connected through circuits. The device and the method have the advantages that the measurement precision is high, and the operation is convenient. The device and the method have important application prospects in aspects of optical fiber communication systems, electro-optic intensity modulator analysis and optical signal processing.

The invention discloses a system and method for testing power stability of a highly stable radiofrequency signal. The system includes a directional coupler, an attenuator set, a microwave power meter, an upper computer, a high precision digital universal meter and a diode detector. The directional coupler is successively in serial connection to the attenuator set and the microwave power. The upper computer conducts system application measurement and control respectively on the microwave power meter and the high precision digital universal meter. A coupling end of the directional coupler is connected to the diode detector. The diode detector is in connection to the high precision digital universal meter and is a gallium arsenide diode detector. According to the invention, the system and the method have the following benefits: through the testing of stability of demodulation voltage, the evaluation object in testing the power stability of the radiofrequency signal is synchronously acquired in a non-distortion manner, and a constant temperature chamber and a gallium arsenide device are configured to reduce the influence on the demodulation voltage by temperature changes to the minimum with the proviso that the power of the input radiofrequency signal stays unchanged.

The invention discloses a measuring device and method for sag frequency of a dispersion optical fiber and belongs to the technical field of photoelectrons, aiming to solve the technical problem that a traditional method can not accurately measure the sag frequency in the prior art. The advantages of strong external interference resistance, high measuring accuracy, and convenience in operation are provided. The device comprises a wave-length tunable laser, a polarization controller, a photoelectric modulator, a microwave signal source, a first optical fiber connector, a to-be-detected dispersion optical fiber, a second optical fiber connector, a photoelectric detector, a microwave power-factor meter and a data acquisition and processing system.

The invention provides a motor vehicle radar speed measurement meter field detection device and a simulation method which are used for on-site detection of a detected motor vehicle radar speed measurement meter. The device comprises a movement target simulation device, a microwave frequency counter, a microwave power meter, an industrial control machine, a closed-loop control pan-tilt and a range finder function unit. The movement target simulation device receives microwave signals of the detected motor vehicle radar speed measurement meter, doppler signals are superimposed, then modulation microwave signals are emitted to the detected motor vehicle radar speed measurement meter, the microwave frequency counter and the microwave power meter receive microwave emission frequency and emission power of the microwave signals respectively, the industrial control machine is connected with the microwave frequency counter / the microwave power meter, the ranging finder and the closed-loop control pan-tilt so as to receive and process data, control operation of function units and coordinate the detection device to automatically finish the whole detection process, the problem that authenticity and repeatability in the motor vehicle radar speed measurement meter on-site detection process are difficult to consider is solved, and a scientific, safe and efficient on-site simulation scheme is provided for detection.

The invention belongs to the technical field of microwave power probes, and relates to a microwave power probe temperature compensation device based on a USB interface. The microwave power probe temperature compensation device based on the USB interface comprises a computer, a signal generator, a USB concentrator, multiple power meter mainframes and power probes. The computer is provided with a GPIB card which is connected with the signal generator through GPIB cables, the computer is connected to the USB concentrator through line concentration USB cables, the USB concentrator is connected with the power meter mainframes respectively through multiple USB cables, and each power meter mainframe is connected with one power probe through an independent 12-core cable. The microwave power probe temperature compensation device based on the USB interface can achieve simultaneous temperature compensation of probes of multiple types / multiple types of power, and is high in reliability and success rate, simple in line connection and easy to operate.

The invention provides a radio frequency identification tester calibration device and method. The device comprises an attenuator, a frequency meter, a microwave power meter, an induction coil, a vector signal analyzer and a signal generator, wherein the transmitting end of a radio frequency identification tester is connected with the attenuator, the frequency meter is connected with the output end of the attenuator, the microwave power meter is connected with the output end of the attenuator, the induction coil is connected with the transmitting end of the radio frequency identification tester, the output end of the induction coil is connected with a digital oscilloscope, the vector signal analyzer is connected with the transmitting end of the radio frequency identification tester, the signal generator is connected with receiving end of the radio frequency identification tester, and the output end of the signal generator is connected the receiving end of the radio frequency identification tester and the input end of the microwave power meter. The radio frequency identification tester calibration device and method can precisely calibrate the radio frequency identification tester used during radio frequency identification card testing.

The invention relates to a microwave device and discloses a microwave power distributor which is based on a waveguide technology and has a cavity structure. The technical scheme is that: the microwave power distributor comprises a rectangular waveguide cavity and a coupling cavity; the coupling cavity basically has a shape of regular quadrangular prism; the center part of one side cylindrical surface of the coupling cavity is connected and communicated with the rectangular waveguide cavity on the short circuit surface of the rectangular waveguide cavity; an even number of windows are formed on the cylindrical surface opposite to the cylindrical surface; a coupler is inserted into each window so as to couple microwave signals; the bottom surface of the regular quadrangular prism is as long as the rectangular waveguide cavity, and the height of the regular quadrangular prism is greater than the width of the rectangular waveguide cavity; the rectangular waveguide cavity is a main circuit port of the microwave power distributor; the couplers are branch circuit ports of the microwave power distributor; and all the branch circuit ports are equant ports. The microwave power distributor is used for synthesizing or distributing microwave power so as to obtain good input / output standing waves and broadband characteristics; and the microwave power distributor is easy to process and convenient to assemble.

A distributed type microwave heating and drying control device comprises a temperature sensor used for measuring the temperature of materials and further comprises a microwave power meter, a CAN bus, a PID controller based on a neural network and a microwave executing unit based on the neural network, wherein the microwave power meter is used for measuring the microwave refection power, and the CAN bus is used for transmitting temperature data, microwave refection power data and the numerical value of the microwave output power. Temperature signals collected by the temperature sensor and reflection power signals collected by the microwave power meter are sent to the CAN bus, the PID controller based on the neural network obtains the corresponding temperature and the corresponding reflection power from the CAN bus and takes the corresponding temperature and the corresponding reflection power as input of the PID controller, the numerical value, processed through an algorithm, of the microwave output power is sent to the corresponding microwave output executing unit, and the microwave output executing unit receives the numerical value of the microwave output power and outputs microwaves with the corresponding power. According to the device, the output power is adjusted in real time according to changes of the temperature of a load, and therefore the heating process or the drying process is made to be safe, efficient and rapid, and the aim of saving energy is achieved.

The invention discloses an automatic test system for an active radar interference device. The system comprises a main control module, an acquisition module, a communication module, a microwave signalsource, a spectrum analyzer, a microwave power meter, an oscilloscope, a transmitting antenna and a receiving antenna, wherein the main control module, functional modules, test instruments and an active radar interference device to be tested are connected in a specific mode, and the functional modules and the test instruments are controlled through corresponding control instructions of the main control module, so that the main control module simultaneously acquires a working voltage and current parameters of the active radar interference device to be tested, which are collected by the acquisition module, and the communication module acquires state information of the active radar interference device to be tested, frequency domain features of a radiation signal of the active radar interference device to be tested, which are acquired by the spectrum analyzer, time domain features of the radiation signal of the active radar interference device to be tested, which are acquired by the oscilloscope, and the intensity of the radiation signal of the active radar interference device to be tested, which is acquired by the microwave power meter, so that test indexes of the active radar interference device to be tested can be automatically tested.

The invention discloses a probe and method for measuring the humidity of wet steam by a rigid microwave coaxial line. The probe comprises a rigid coaxial line outer conductor, a sampling head, an end part connecting piece, an outer sleeve pipe, a rear end cover, a flow guide pipe, an adjusting valve, vacuum pumping equipment, a T-shaped positioning bracket, a ceramic sleeve pipe, a rigid coaxial line inner conductor, a microwave source, a microwave power meter, a porous corundum bar, a rigid coaxial line terminal resistor and a data acquisition system. The probe can accurately measure the humidity of the wet steam.

The invention relates to a method of setting a colorless optical network unit uplink optical wavelength based on beat noise. In a colorless ONU (105), a low bandwidth photoelectric detector used for generating beat noise is accessed; a microwave power meter transmits detected beat noise power to a control unit (1053) in real time; the control unit (1053) determines whether a current output optical wavelength of a tunable laser or a tunable optical transmitter is consistent with the wavelength of a downlink optical signal, and if yes, the operating wavelength of the tunable laser or the tunable optical transmitter is set as a current optical wavelength or a specified optical wavelength, otherwise the control unit (1053) controls the tunable laser or the tunable optical transmitter to continuously perform optical wavelength polling. According to the method, a colorless ONU based on a tunable laser or a tunable optical transmitter can independently set an upward optical wavelength by no means of an OLT, and thereby the method can be widely applied to the wavelength division multiplexing passive optical network technical field.

The present invention discloses a system for test of performance of a multi-magnetron microwave heating device. The system is configured to perform performance test of a microwave system of a plurality of magnetrons being fed into a microwave heating cavity. The test system comprises a sampling unit, an AD conversion module and a data processing display unit which are connected in order. The sampling unit comprises a system sampling module and a single-tube sampling module, and the single-tube sampling module comprises a single-tube power supply sampling module, a magnetron parameter sampling module and a microwave power meter. The present invention further discloses a method for test of the performance of a multi-magnetron microwave heating device. According to the collected system parameters and the single-tube parameters of each magnetron, the performance of the multi-magnetron microwave heating device is analyzed. The test system is simple in structure and comprehensive in collection data, and facilitate performing efficient and accurate analysis of the performance of the microwave system through adoption of the test method.

The invention discloses a microwave load for a 0-6 GHz calorimetric microwave power meter. The load comprises: a microwave load circuit, a liquid circulation and heat conduction channel, a liquid channel interface, a microwave load circuit interface, a heat insulation device and a sealing shell; the heat insulation device and the microwave load circuit are both of cavity structures, the microwaveload circuit is in an inner cavity of the heat insulation device, and the liquid channel interface and the microwave load circuit interface are reserved on the heat insulation device; one end of the cavity in the microwave load circuit is connected with the microwave load circuit interface, the liquid circulation and heat conduction channel is located in the cavity of the microwave load circuit, the liquid circulation and heat conduction channel is in close contact with the microwave load circuit, and the both ends of the liquid circulation and heat conduction channel are connected with the liquid channel interface; and the problems that microwave millimeter wave power from several watts to hundreds of watts cannot be measured by direct measurement or a high-power water load method, and that a coupling measurement method has insufficient accuracy are overcome.

The invention belongs to the testing technology and relates to the improvement of detection equipment for a capture and control command pod. It is made up of VXI bus instrument [19], test control computer [10], integrated display and keyboard [11], test unit adapter [15] and power supply system [18], is characterized in that, said VXI bus instrument [ 19] also has a servo test module [1], a microwave power meter module [2], an image receiving channel test module [3] and an instruction transmitting channel test module [4]. The said test unit adapter [15] has a radio frequency Image transmission interface [12], electronic box test interface [14] and radio frequency command receiving interface [17]. The invention can detect the capture and control command pods transmitted by radio frequency signals, and meets the requirements for the development of a new generation of capture and control command pods.

The invention provides a low-temperature double-layer isolation compensating type micro-electromechanical system (MEMS) microwave power sensor. The technical scheme is that an inner isolating ring and an outer isolating ring are etched on the periphery of a microwave power sensor one, the microwave power sensor is enclosed to define an isolating island, lost heat of an MEMS microwave power sensor in the prior art is further reduced through a substrate, at the same time a first heating circuit and a second heating circuit are arranged on the inner side of the inner isolating ring, a thermal resistance is used to heat, the MEMS microwave power sensor is kept to work under normal temperature, influence of environmental temperature on sensitivity of the MEMS microwave power sensor in the prior art is further reduced, test accuracy of the microwave power sensor is further improved, output voltage of the microwave power sensor one and output voltage of a microwave power sensor two are used to obtain errors of the microwave power sensor in the prior art due to heat loss and the influence of the environmental temperature, the errors are added to a microwave power sensor three with errors to achieve temperature compensation.

The invention discloses a measurement method of the reflection coefficient of a calibration signal source in a microwave power meter. The method includes the following steps that: the general expression of the incident power of a load is obtained according to the reflection coefficient of the signal source, the power of the transmission of the signal source to the non-reflection load, the reflection coefficient of the load, the phase angle of the reflection coefficient of the signal source and the phase angle of the reflection coefficient of the load; the sum of the phase angle of the reflection coefficient of the signal source and the phase angle of the reflection coefficient of the load is adjusted by a first preset angle and a second preset angle according to the general expression of the incident power of the load, so that the first expression of the incident power of the load, and the second expression of the incident power of the load can be obtained; and the general expression of the incident power of the load, the first expression of the incident power of the load and the second expression of the incident power of the load are associated, so that the reflection coefficient of the signal source can be obtained. According to the measurement method of the invention, the reflection coefficient of the calibration source can be determined through measuring the power quantity value of the calibration source under a specific phase shift condition.

The invention relates to the field of microwave discharge plasma, and specifically relates to an atmospheric-pressure low-power microwave hairpin resonant discharger. The discharger comprises a quartztube, a U-shaped metal wire, a grounding copper glue film, and a carrier gas input end. A U-shaped metal wire in the quartz tube is electrically connected with a microwave power meter and a power amplifier, and the power amplifier is electrically connected to a pulse signal modulator and a microwave signal generator. One end of the quartz tube serves as the carrier gas input end. The discharger employs a hairpin-shaped microwave resonant electrode as a discharge driver. Different types of carrier gas serve as working gas under the atmospheric pressure, and the working gas enters the quartz tube through the carrier gas input end, and passes through the U-shaped metal wire. The microwave signal generator is started, and the pulse frequency value of the pulse signal modulator is set. The power amplifier is adjusted to maintain the specific power output while observing the microwave power meter. The discharge phenomenon happens in the quartz tube, and the tip of the U-shaped metal wire generates a plasma plume. Moreover, a clear arch-shaped pattern is presented.

The invention discloses a sensing wavelength demodulation scheme based on microwave power detection. A light signal with a wavelength to be measured is injected in a strength modulator and is modulated by a sinusoidal microwave signal under a small signal modulation condition; the modulated light signal is divided equally into two paths for transmission, wherein a first path light signal introduces microwave power attenuation effect caused by dispersion by a dispersion element, and a second path does not introduce dispersion; the light signal passes through a tuning light attenuator to balance the light power loss of the two paths; then, the two microwave powers of the two paths are detected by a photoelectric detector and a microwave power meter and inputted to a power comparison module at the same time to acquire a corresponding relation of a microwave power ratio and a wavelength to be measured, thus the wavelength to be measured is demodulated. The invention demodulates a momentary wavelength, is not influenced by the power fluctuation of an input light signal and has flexibly adjusted demodulation precision and demodulation range.

The invention discloses a broadband microwave power meter and an interference signal filtering method. The power meter comprises an A / D conversion module, an FFT (fast Fourier transform) module, a power spectrum estimation module, a power spectrum integration module, an interference detection module and a digital filter module, wherein the A / D conversion module is used for carrying out A / D conversion for an intermediate-frequency input signal, the signal is converted to a digital signal from an analog signal; the FFT module is used for converting the digital signal to a frequency domain from a time domain; the power spectrum estimation module is used for carrying out power spectrum estimation for the frequency domain signal; the power spectrum integration module is used for accumulating the power spectrum to improve the signal to noise ratio of the power spectrum estimation; the interference detection module is used for identifying an interference signal; and the digital filter moduleis used for filtering the interference signal. According to the broadband microwave power meter disclosed by the invention, the interference signal entering the frequency band is automatically identified and filtered; and meanwhile, filter parameters are manually configured so as to ensure that a radio telescope can normally observe in the presence of stronger interference signals.

The invention discloses a test system and method suitable for high stability radio frequency signal power stability. The system includes a directional coupler, an attenuator group, a microwave power meter, a host computer, a high-precision digital multimeter and a diode detector. The directional coupler is connected in series with the attenuator group and the microwave power meter in turn, and the host computer performs system application measurement and control on the microwave power meter and the high-precision digital multimeter respectively through the program control bus, and the coupling end of the directional coupler is connected with the diode detector , the diode detector is connected with a high-precision digital multimeter, and the diode detector is a gallium arsenide diode detector. The beneficial effects of the present invention are: the present invention realizes the test and evaluation target of radio frequency signal power stability obtained synchronously without distortion through the test of the detection voltage stability, and the design of the constant temperature cavity and the gallium arsenide device makes the power of the input radio frequency signal constant In some cases, the detection voltage is affected by temperature changes to a minimum.

A microwave moisture sensor for agricultural materials, such as grains and nuts, is disclosed herein that includes a material sample holder having a substantially cylindrical cavity formed therein. The meter assembly further includes a transmitting antenna on a side of the sample holder and a receiving antenna on a side of sample holder directly opposite the transmitting antenna wherein the sample holder is located between the two antennas, the receiving antenna configured to receive a transmitted microwave through the sample holder.

The invention discloses an aging simulation system and method for a negative electrode of a grid-control travelling wave tube, and belongs to the technical field of negative electrode simulation of the travelling wave tube. The aging simulation system for the negative electrode of the grid-control travelling wave tube, disclosed by the invention, comprises a monitoring unit, a power supply unit, afloating plate modulator, a filament power supply, a negative electrode power supply, a collector power supply, a titanium pump power supply, a microwave signal source, a microwave power meter and anattenuator, wherein a simulation object is the travelling wave tube. The invention also discloses the aging simulation method for the negative electrode of the grid-control travelling wave tube, which is used for the aging simulation system for the negative electrode of the grid-control travelling wave tube. The aging simulation of the negative electrode of the grid-control travelling wave tube is achieved, the reliability and the stability of the grid-control travelling wave tube are improved, and the service lifetime of the grid-control travelling wave tube is prolonged; and the following purposes of improving the vacuum degree in the grid-control travelling wave tube, improving insulation performance of each electrode, simulating the activity of the negative electrode and improving theelectron emission capability of the negative electrode of the travelling wave tube can be achieved.

The invention discloses a measurement method of the reflection coefficient of a calibration signal source in a microwave power meter. The method includes the following steps that: the general expression of the incident power of a load is obtained according to the reflection coefficient of the signal source, the power of the transmission of the signal source to the non-reflection load, the reflection coefficient of the load, the phase angle of the reflection coefficient of the signal source and the phase angle of the reflection coefficient of the load; the sum of the phase angle of the reflection coefficient of the signal source and the phase angle of the reflection coefficient of the load is adjusted by a first preset angle and a second preset angle according to the general expression of the incident power of the load, so that the first expression of the incident power of the load, and the second expression of the incident power of the load can be obtained; and the general expression of the incident power of the load, the first expression of the incident power of the load and the second expression of the incident power of the load are associated, so that the reflection coefficient of the signal source can be obtained. According to the measurement method of the invention, the reflection coefficient of the calibration source can be determined through measuring the power quantity value of the calibration source under a specific phase shift condition.

The invention discloses a measuring device and method for sag frequency of a dispersion optical fiber and belongs to the technical field of photoelectrons, aiming to solve the technical problem that a traditional method can not accurately measure the sag frequency in the prior art. The advantages of strong external interference resistance, high measuring accuracy, and convenience in operation are provided. The device comprises a wave-length tunable laser, a polarization controller, a photoelectric modulator, a microwave signal source, a first optical fiber connector, a to-be-detected dispersion optical fiber, a second optical fiber connector, a photoelectric detector, a microwave power-factor meter and a data acquisition and processing system.