7 results about "Signal amplifier" patented technology

The invention provides a ZYNQ-based portable human body impedance imaging device capable of being worn during exercise. Current excitation voltage measurement and a dynamic impedance imaging mode are adopted. The device comprises a wearable electrode array, an excitation source, a collection circuit, a multiplexer, a ZYNQ processor, a display screen and a rechargeable battery. Button electrodes are uniformly fixed to an elastic cord firmly to ensure that the distances between the electrodes are equal; the current excitation source is composed of a processor DDS IP core, a DAC and a V/I circuit to obtain controllable constant current source frequency; the collection circuit comprises a signal amplifier, a single-ended to differential device, a filter and an ADC to ensure a high signal to noise ratio; the multiplexer realizes selection of a working electrode; a ZYNQ is adopted as the processor, a programmable logic device of the ZYNQ realizes signal excitation, a DPSD mode is adopted for measurement to resist all kinds of pilot frequency noise including exercise muscle electrical noise, and image reconstruction and display are realized through on-chip linux or an Android operating system. The device has the advantages of being capable of being worn during exercise, small, free of damage, capable of realizing real-time imaging and convenient to use eventually.

The invention relates to a program controlled trigger and a method. A Hall current sensor senses current of a welding machine and outputs a voltage sensing signal; a signal amplifier amplifies the voltage sensing signal; a Schmitt trigger processes the amplified voltage sensing signal and triggers to generate a square signal; a singlechip captures rising edges and falling edges of the square signal, counts, and generates a pulse signal when a counting value reaches a set value; the singlechip regulates and controls the position of a tap of a digital potentiometer; an outputting pulse circuit outputs the pulse signal to an external high-speed camera; and the digital potentiometer regulates a forward threshold value and a reverse threshold value of the Schmitt trigger according to the position of the regulated and controlled tap, and carries out program control on the threshold values and pre-amplification times. Compared with the prior art, the program controlled trigger runs stably, carries out program control on the threshold values and the pre-amplification times, and can adapt to different welding environments.

The invention discloses a projectile simulation launching device, and belongs to the field of the armament science and technology. The device comprises a gas gun launching unit, a pressure relief brake control unit, a rotating speed control unit and a speed measuring device unit; the gas gun launching unit comprises a high-pressure gas chamber, a launching pipe, a piston component and a projectile support; the pressure relief brake control unit comprises a gas storage bottle, an electromagnetic valve (7), an electromagnetic valve (6), an electromagnetic valve (3), a data acquisition unit, a signal amplifier and a control main center; the rotating speed control unit comprises the projectile support and a launching pipe rifling; and the speed measuring device unit comprises a laser launching and receiving device, a laser controller, the data acquisition unit and the control main center. The projectile simulation launching device has the beneficial effect of close-range, high-precision, high-repeatability and environment-friendly launching and meets the requirement of the finish effect test study.

The invention discloses a device for online measuring dynamic performance of an ultra-precision hydrostatic spindle and a method for measuring the dynamic performance of the hydrostatic spindle by using the same, and relates to the method for online measuring the dynamic performance of the ultra-precision hydrostatic spindle. The problem that in the convention method, online measurement of the dynamic performance of the ultra-precision hydrostatic spindle cannot be carried out, or influence of an installing error and a manufacturing error of a measuring benchmark on a measuring result is difficultly avoided is solved. The method provided by the invention comprises the following steps: acquiring displacement information between a sensor and a standard ball by using a high-precision displacement sensor; amplifying the acquired displacement information by a signal amplifier; inputting the acquired displacement information into a computer after passing through an A/D (analog/digital) conversion circuit and a data acquisition circuit; acquiring phase information of the spindle and inputting the phase information into the computer by using a rotary encoder; analyzing and processing the phase information by the computer to obtain error data of the rotating dynamic performance of the ultra-precision hydrostatic spindle, thereof implementing the online measurement of the dynamic performance of the ultra-precision hydrostatic spindle. The device and the method are applicable to the online measurement of the dynamic performance of the ultra-precision hydrostatic spindle.

The embodiment of the invention discloses a rear driver with voltage protection. The rear driver comprises an input pair circuit, a protection circuit, a common mode sensing circuit and an amplifier. The input pair circuit outputs a first signal from a first node and outputs a second signal from a second node according to a first input signal and a second input signal. The protection circuit provides voltage protection for the input pair circuit according to a plurality of first bias voltages and a plurality of second bias voltages, transmits a first signal to a first load to generate a first output signal, and transmits a second signal to a second load to generate a second output signal. The common mode sensing circuit senses a level of the first node and a level of the second node to generate a feedback signal. The amplifier generates a second bias voltage according to a reference voltage and the feedback signal.

The invention discloses a high gain computer network signal amplifier. A structure thereof comprises a master machine body, an upper machine body, output connection ports, output working state displaylamps, a power button, a fixing holder, a fixing screw-socket, a lower machine body, a reset button, an input connection port and a power connection port. The upper machine body is set at the upper part of the master machine body. The output connection ports are set below the output connection ports. The power button is set at the left side of the output working state display lamps. The lower side of the upper machine body is connected with the lower machine body. The amplifier is equipped with an anti-interference device, the condition that the signal quality is reduced due to the mutual interference before the signals are output can be effectively prevented, the output signal strength and quality can be effectively improved, and the device use security and stability can be improved.

The invention discloses development equipment based on wireless sensor network technology. The development equipment comprises a signal amplifier, a box body, a sensor chip, an indicator lamp, a sucker seat, a wire socket, a neck entrance, a data network interface, and an antenna; a top surface of the sucker seat is arranged at the center of the bottom section of the box body; the sucker seat is composed of an iron core, a coil plate, a guiding mechanism, a tubular pile, a cover plate and a sucker; the coil plate is a cuboid structure with two side surfaces which are mutually vertical in parallel, the sucker is arranged at the bottom, and the coil plate and the guiding mechanism are in interference fit through the tubular pile. The development equipment disclosed by the invention has the advantages that the sucker seat is arranged, the iron core is sleeved through a magnetic wire on the coil plate, thereby stabilizing a location of the box body; the sucker adsorbs the air to fix the cover plate on the specified table top location, the equipment is supported by driving the coil plate through the cooperation of the tubular and the guiding mechanism, thereby preventing the equipment from falling off; and the guiding mechanism can be rotated so that the equipment can incline to a direction with high signal intensity, and the balance of the signal can be maintained.