5results about How to "Solve measurement difficulties" patented technology

This application provides a two-dimensional balancing motion device, relating to the technical field of motion devices. The two-dimensional balancing motion device provided in this application includes: a base, a first-direction balancing mass driving device and a second-direction balancing mass driving device disposed on the base, a two-dimensional balancing mass block connected to the first-direction balancing mass driving device and the second-direction balancing mass driving device, a two-dimensional motion device disposed on the two-dimensional balancing mass block, and a driven component connected to the two-dimensional motion device; the two-dimensional balancing mass block is an integral structure; the first-direction balancing mass driving device is capable of driving the two-dimensional balancing mass block to move along a first direction, and the first-direction balancing mass driving device is configured to allow the two-dimensional balancing mass block to move along a second direction; the second-direction balancing mass driving device is capable of driving the two-dimensional balancing mass block to move along a second direction, and the second-direction balancing mass driving device is configured to allow the two-dimensional balancing mass block to move along the first direction.

The present invention provides a device and method for measuring the body length of lepidopteran larvae, mainly including a chassis (1) and a top cover (2); the chassis is provided with multiple groups of measurement channels (12), and through the cooperation of measurement channels (12) with different widths, the behavior of the larvae is guided to enter the measurement channel (12) adapted to the body shape of the larvae, so that on the premise of accurately measuring the body length of lepidopteran larvae, the measurement deviation caused by the curling up and strong activity of the larvae can be reduced, and at the same time, the harm to the larvae during the measurement process can be reduced; the device for measuring the body length of lepidopteran larvae is generally easy to install and convenient to operate.

This invention provides a DC active filter device based on square wave modulation. The device includes: at least one independent DC active filter unit; each DC active filter unit is connected in parallel across the two ends of a DC bus; each DC active filter unit includes: a measurement circuit that measures the ripple current of the DC bus; a control circuit that calculates the frequency components of the ripple current and then obtains a switching signal through square wave modulation, the frequency of which is equal to the target frequency of the ripple current to be compensated; and a drive circuit that sends the switching signal to the main power circuit, causing the switching devices in the main power circuit to operate and generate a compensation current to compensate for the ripple current of the target frequency component of the DC bus. This invention solves the problem of poor ripple suppression performance of high-power DC active filters at low switching frequencies. It enables the application of DC active filters at lower switching frequencies up to MW-level power applications, meeting the DC bus ripple suppression requirements for long-term operation of high-power power supplies.

The invention discloses an ultra-wideband channel characteristic photoelectric fusion measuring device, which is characterized by comprising a vector network analyzer, a signal processing module, a signal processing module, a signal processing module, a signal processing module and a signal processing module, wherein the vector network analyzer is used for generating sweep frequency signals according to start-stop frequencies and sweep frequency points of ultra-wideband channel measurement; the measurement signal transmitting unit is used for transmitting an ultra wide band radio frequency measurement signal according to the sweep frequency signal; the measurement signal receiving unit is used for receiving the ultra wide band radio frequency measurement signal transmitted through a wireless channel and obtaining frequency domain response data of the ultra wide band radio frequency measurement signal through system response loss compensation; the channel data acquisition and storage unit is used for acquiring time domain response data according to the frequency domain response data and storing the frequency domain response data and the time domain response data; and the intelligent channel characteristic analysis unit is used for analyzing the characteristics of the multi-dimensional ultra-wideband channel according to the frequency domain response data and the time domain response data. According to the invention, ultra-wideband channel measurement in indoor and outdoor scenes is supported, and multi-dimensional channel parameters in the ultra-wideband channel can be accurately extracted.

The invention discloses a stability evaluation method, device and equipment for a DRAM (Dynamic Random Access Memory) power supply and a storage medium, and the method comprises the following steps: running a preset first test program in a kernel stage of a starting process of an operating system of tested equipment to obtain a power supply voltage of a system-on-chip, carrying out first stability evaluation according to a comparison result of the power supply voltage of the system-on-chip and a preset first threshold value; running a preset second test program in a boot loader stage of the starting process of the operating system to obtain the power supply voltage of the DRAM, and performing second stability evaluation according to a comparison result of the power supply voltage of the DRAM and a preset second threshold value; wherein when the first stability evaluation and the second stability evaluation are both passed, the power supply stability evaluation of the DRAM is judged to be passed, and otherwise, the power supply stability evaluation of the DRAM is judged not to be passed. According to the invention, the problems of inaccurate evaluation, complex operation and incapability of adapting to high-density PCB design caused by direct measurement of voltage fluctuation of the power supply pin by depending on an oscilloscope in the prior art are solved.