43 results about "Microwave power meter" patented technology

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 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 discloses a microwave load for a 0-6GHz calorimetric microwave power meter. The load includes: a microwave load circuit, a liquid circulation and heat conduction channel, a liquid channel interface, a microwave load circuit interface, a thermal insulation device, and a sealed casing; Both the heat insulation device and the microwave load circuit are cavity structures, the microwave load circuit is fixed in the 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 to the microwave load The circuit interface, the liquid circulation and heat conduction channel are located in the cavity of the microwave load circuit, the liquid circulation and heat conduction channel are close to the microwave load circuit, and the two ends of the liquid circulation and heat conduction channel are connected to the liquid channel interface; it overcomes the need for direct measurement and high-power water The load method cannot measure the microwave and millimeter wave power of several watts to hundreds of watts, and the coupling measurement method is not accurate enough.

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.

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 load for a millimeter-wave calorimetric microwave power meter, which comprises: a microwave dry load, a liquid circulation and heat conduction channel, a liquid channel inlet, a liquid channel outlet, a waveguide mode converter, an adiabatic device, and a sealed casing; The shell is fixed in the inner cavity of the heat insulation device, the microwave dry load is installed in the cavity of the sealed shell, the input end of the waveguide mode converter extends to the outside of the heat insulation device, and the output end of the waveguide mode converter is connected to the microwave inlet of the microwave dry load , the waveguide mode converter is used to convert the microwave inlet of the microwave dry load into a standard waveguide interface; there is a liquid circulation and heat conduction channel between the microwave dry load and the inner wall of the sealed shell, and a liquid channel is provided between the heat insulation device and the sealed shell The inlet and the outlet of the liquid channel; the load can overcome the problems in the prior art that the direct measurement and high-power water load method cannot measure the millimeter-wave power of several watts to hundreds of watts, and the coupling measurement method has insufficient precision.

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.