30 results about "THD analyzer" patented technology

The invention provides a noise acquisition device and a noise measurement device of an operational amplifier. The noise acquisition device comprises a preset resistor matched with a target operational amplifier, a total noise acquisition circuit and a resistance noise acquisition circuit, the total noise acquisition circuit acquires the total noise of the current working environment and amplifies the total noise so as to output the amplified total noise to external preset measurement equipment; the resistance noise acquisition circuit acquires and amplifies first noise correspondingly generated by the preset resistor in the current working environment and carries out amplification processing so as to output the amplified first noise to preset measurement equipment. The total noise and the first noise are collected, the first noise is used for compensating the total noise to obtain the noise of the target operational amplifier, and the defects that measurement cannot be conducted due to the fact that the bottom noise of the spectrum analyzer is too large and the measurement accuracy is reduced due to the first noise are overcome; low-ripple positive and negative direct-current power supply voltage is provided, and the size is small; the spatial noise coupling interference is reduced, and the accuracy is improved.

The utility model discloses a shield tunnel segment wall back grouting real-time detection device which is arranged at the shield tail of a shield tunneling machine, two construction platforms are symmetrically arranged in the shield tunneling machine, and the shield tunnel segment wall back grouting real-time detection device comprises an annular track which is movably installed between the two construction platforms in the tunneling direction of the shield tunneling machine. The circular track has an arc consistent with the radian of the outer wall of the duct piece; the sound wave detector is arranged on the outer side of the annular track in a reciprocating motion mode along the annular track, and the height of the sound wave detector can be adjusted in the radial direction of the duct piece; according to the grouting plumpness detection device, the grouting plumpness on a propagation path is reflected by utilizing the propagation speed of the sound waves in different media and the frequency change of the waves, the grouting plumpness can be detected in real time along with tunneling of a shield, and the grouting plumpness can be accurately detected. And a certain popularization value is achieved.

A kind of transmission equipment intelligent monitoring system and method based on noise feature analysis, through the method, expert can input the sound evaluation information heard from console, the sound evaluation value of expert corresponds to the state of specific reduction mechanism, the loudness and frequency characteristic of noise signal output by spectrum analyzer as input layer, the sound evaluation value of expert as output layer, mapping relationship between the two is established through data accumulation and neural network algorithm. Through the database of abnormal noise experts as a reference, warning is found by comparing similar abnormal noise data, ensure that noise meets the standard, through the noise evaluation of experts and neural network algorithm, the timbre can be evaluated, and then the specific type of fault can be judged. Moreover, the influence of on-site noise on sound signal collection is excluded, and the accuracy of machine detection is further improved.

The application discloses a kind of mill sound analyzers, receiver, for receiving the audio signal frequency band in the process of ball mill equipment operation;Filter module, amplification module, intelligent analysis module, output module;The processing analysis module includes: energy spectrum calculation module, carries out spectrum analysis to audio signal frequency band, extracts the energy of each frequency band as feature, and constructs feature vector in combination with historical state;Model inference module, using the constructed feature vector is handled to predict the current ball mill capacity.The application receives the audio signal of ball mill equipment in real time, and carries out processing and analysis to it, quickly responds the change of ball mill equipment operating state, realizes accurate prediction to ball mill capacity, optimizes the operating parameter of ball mill equipment by accurately predicting ball mill capacity, improves production efficiency and product quality, the application of intelligent analysis module and model inference module makes the management of ball mill equipment more intelligent and automated, reduces the complexity and cost of manual intervention.

The utility model relates to an abnormal sound detection device, which is arranged in a test box and comprises a tool clamp, a detection device and a control device, the tool clamp is installed on the bottom wall of the test box and used for clamping a to-be-tested product. An internal fixture; the internal fixing piece is mounted on the top wall of the test box and is arranged above the tool clamp; a pressing device; the pressing device is arranged on the internal fixing piece and is used for pressing a key of the product to be tested and enabling the product to be tested to generate air medium noise; the microphone is arranged on the internal fixing piece and is used for collecting audio data of the air medium noise and sending the audio data to an acoustic analyzer; the acoustic analyzer is electrically connected with the microphone; and the acoustic analyzer detects whether the to-be-detected product generates abnormal sound or not according to the audio data. According to the invention, manual detection is replaced by a mechanical device, the sound is accurately analyzed, and the efficiency and accuracy of abnormal sound detection are improved.

The objective of the present invention is to provide a Brillouin gain analysis device and a Brillouin gain analysis method with which it is possible for high-speed strain changes in an optical fiber to be measured distributionally.　A Brillouin gain analysis device 301 according to the present invention comprises: a laser 11 for outputting continuous light having a single frequency; a pulse generator 12 for pulsing the continuous light from the laser and inputting the same into one end of an optical fiber 50 being measured; an ASE light source 13 for generating continuous light having frequency components over a wider band than the frequency of the continuous light output by the laser 11, and inputting the same into the other end of the optical fiber 50; a modulator 14 for generating local light obtained by shifting the frequency of the continuous light from the laser 11 by an arbitrarily defined frequency; and a wave detector 15 for performing heterodyne detection between Brillouin scattered light generated by the optical fiber and the local light.

The invention discloses a TDLAS (Tunable Diode Laser Absorption Spectroscopy) analyzer for H2O2 gas, and belongs to the technical field of gas concentration detection. In the H2O2 gas TDLAS analyzer, the inner surface of the gas path system in contact with H2O2 gas is subjected to inert treatment to form a chemical inert layer, so that the gas adsorption loss can be effectively inhibited; the optical path system is arranged in the heat preservation case, a stable physical environment is provided for TDLAS measurement, an instrument is almost not interfered by the field environment, and the long-term drift is extremely small; the laser driving module adopts a composite current source architecture and comprises an operational amplifier serving as an error amplification stage and a push-pull circuit serving as an output stage, so that the stability problem under high-current and high-frequency modulation is fundamentally solved, nearly ideal light source modulation signals are provided for TDLAS detection, and a basis is provided for high-precision harmonic detection. According to the invention, high-performance driving, enhanced protection and precise environment control are deeply coupled, and the precision, stability and reliability of H2O2 gas detection are effectively improved.

1. Name of the product in this design: Multifunctional Signal Analyzer. 2. Application of this design: This design is intended for use in information science electronic measuring instruments. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The application relates to a plate material dielectric stability test method and a test system, and relates to the technical field of electromagnetic measurement.The plate material dielectric stability test method comprises the following steps: step 1: a planar capacitive resonance module is attached to the upper surface of a material to be measured, the planar capacitive resonance module comprises a resonance coil and two capacitive plates arranged on the same plane, and the two terminals of the resonance coil are connected to the two capacitive plates in a one-to-one correspondence; step 2: a frequency analyzer reads resonance frequency information through a coupler matched with the planar capacitive resonance module; step 3: the temperature of the material to be measured is measured, the temperature and the characteristic points of the resonance frequency information are compared with a pre-stored parameter comparison table, and the corresponding dielectric constant is obtained as a measured dielectric constant, the parameter comparison table records the corresponding relationship among the temperature, the characteristic points of the resonance frequency information and the dielectric constant; and step 4: the measured dielectric constant is compared with a theoretical dielectric constant.The application can realize nondestructive testing.

The utility model provides a phase noise analyzer spread spectrum device and a phase noise analysis system. The phase noise analyzer spread spectrum device comprises a to-be-detected source signal processing assembly, a first reference signal generating assembly, a second reference signal generating assembly, a first frequency conversion assembly and a second frequency conversion assembly. The to-be-tested source signal processing assembly is electrically connected with the first frequency conversion assembly and the second frequency conversion assembly. The first reference signal generation component is electrically connected with the first frequency conversion component; the first reference signal generation assembly is used for generating two paths of first reference signals, one path is input into the first frequency conversion assembly, and the other path is connected to the phase noise baseband analyzer; the second reference signal generation component is electrically connected with the second frequency conversion component; and the second reference signal generation assembly is used for generating two paths of second reference signals, one path is input into the second frequency conversion assembly, and the other path is connected to the phase noise baseband analyzer. According to the invention, the reference source and the local oscillator are combined into one, so that the cost of the device is reduced, and the accuracy of phase noise measurement is improved.

The invention discloses a test field design method based on target scattering characteristics, and relates to the technical field of target scattering measurement, and the method comprises the steps: determining the dominant scattering type of a measured target according to the appearance structure of the measured target, and the dominant scattering type comprises simple mirror surface scattering, coupling scattering with multiple reflections as the main part or antenna / load scattering; system parameters are optimized based on scattering types, and for a coupling scattering or antenna / load scattering target, according to a plane where an equivalent large aperture is located, a receiving and transmitting antenna vertical layout of a feed source system is set by combining a single-station and double-station RCS equivalent theorem; the sweep frequency interval and pulse parameters of the vector network analyzer are configured according to the position of the scattering source, so that the vector network analyzer has enough distance measurement capability; background, calibration and target measurement are carried out, and a high-precision single-station RCS result is obtained. According to the method, the accuracy and applicability of RCS measurement of the complex target are remarkably improved.

A first detector that receives and detects 3-tone signals of three patterns of a first 3-tone signal obtained by combining three waves of angular frequencies ω1, ω2, and ω3 (here, ω2−ω1=ω3−ω2=Δω is established), a second 3-tone signal in which each tone has a phase offset, and a third 3-tone signal having a phase offset different from the phase offset of the second 3-tone signal, a BPF that allows only a beat component of an angular frequency difference Δω between adjacent waves of the 3-tone signals among signals output from the first detector to pass, a second detector that detects power of the beat component that has passed through the BPF, a voltmeter that measures a voltage of a signal output from the second detector, and a phase calculator that calculates a phase based on the measured voltage values of the three patterns.

The present application relates to the technical field of acoustic metrology, and more particularly to a standard phase generation and calibration device based on a pressure field coupling cavity. The present application comprises two end surfaces of an equal-phase plane wave coupling cavity, which are respectively sealed and connected with a receiving microphone and a transmitting microphone. In the equal-phase plane wave coupling cavity, the phase of the sound pressure signal is equal everywhere. A reciprocity phase calibrator is connected with the receiving microphone and the transmitting microphone, and collects voltage, current and phase information of the equal-phase plane wave coupling cavity. A multi-channel sound analyzer is connected with the reciprocity phase calibrator, and is used to measure the phase difference between the transmitting channel and the receiving channel. An output end of a signal source is connected with an input end of the reciprocity phase calibrator. Measuring and control software is connected with the reciprocity phase calibrator and the multi-channel sound analyzer, respectively. The present application proposes a reciprocity method for calibrating the sensitivity and absolute phase, so as to realize the standard phase generation and calibration based on the pressure field coupling cavity.

The utility model provides an audio analyzer assembly structure, and relates to the technical field of audio analyzer assembly, the audio analyzer assembly structure comprises a main housing, the top ends of the two sides of the main housing are provided with pad grooves, and the pad grooves are fixedly provided with curved edge plates. Although a part of weight can be shared, the equipment is still inevitable to shake in the carrying process due to the fact that the walking speed, the force exerting direction and the like are difficult to be completely synchronized, the risk of equipment damage is greatly increased due to the unstable state, and especially for the design of the handle, if stress is uneven or accidental collision occurs in the carrying process, the equipment cannot be damaged. At present, the connection part of the handle and the equipment main body is easily broken, or more seriously, the deformation of the metal box body is directly caused, and once the situation occurs, the appearance integrity of the equipment is influenced, and more importantly, the precision structure in the equipment is damaged, and the test performance and accuracy of the equipment are influenced.

The invention belongs to the technical field of wireless communication, and particularly discloses a phase compensation method and system for restraining intermodulation and harmonic waves of a short wave transmitter and application, and the system comprises a phase compensation module, a digital pre-distortion model training and pre-distortion signal generation module, a digital up-conversion module and the like which are connected through a feedback loop. After time delay and amplitude alignment are carried out on feedback signals through the data preprocessing module, fundamental wave and harmonic wave phase deviation caused by factors such as radio frequency time delay and down-conversion is accurately estimated and compensated through the phase compensation module, and a group time delay compensation coefficient measured through the vector network analyzer is introduced to carry out further compensation on harmonic waves. According to the method, the digital pre-distortion model can more accurately represent the nonlinear characteristic of the power amplifier, so that an effective pre-distortion signal is generated, intermodulation distortion and multiple harmonic distortion output by the power amplifier are remarkably suppressed, the linearity and communication quality of a short wave transmitter are improved, and meanwhile, equipment miniaturization is facilitated.

The invention relates to a high-specific-surface-area titanium sol porous ceramic air purification filter element and a manufacturing method thereof, and belongs to the technical field of material science and engineering.The manufacturing method comprises the steps that S1, a heat treatment cavity body, a sensing and control unit and a suspension type weighing structure are arranged, the sensing and control unit comprises a high-precision pressure sensor, an atmosphere analyzer, an acoustic analysis part, a sample thermocouple and a reference thermocouple, and the suspended weighing structure comprises a ceramic suspender and a ceramic hanger. The upper end of the ceramic hanging rod is connected with the high-precision pressure sensor, a sound wave exciter of the acoustic analysis part and a sound wave receiver, and the lower end of the ceramic hanging rod is connected with the ceramic hanging tool. The problem of mechanical interference in traditional high-temperature weighing and acoustic measurement is successfully solved, and fingerprints of four key processes in the heat treatment process are acquired in real time.

A measurement device such as a signal analyzer, spectrum analyzer or vector network analyzer is connected 11 to a device under test (DUT). A signal impairment parameter, such as a noise figure of the

This automated analyzing device comprises: a diluent flow passage 1033 and an internal standard solution flow passage 1043 from a diluent accommodating bottle 1032 and an internal standard solution accommodating bottle 1042 to a dilution tank 1010; a measurement solution suction nozzle 1052 from the dilution tank 1010 to an analyzing unit 1092; a first temperature regulating unit 1091 which performs temperature regulation of the dilution tank 1010, the measurement solution suction nozzle 1052 and the analyzing unit 1092; a second temperature regulating unit 1036 which is controlled for temperature regulation independently of the first temperature regulating unit 1091, and which performs temperature regulation of the diluent flow passage 1033 and the internal standard solution flow passage 1043; and a thermal insulation mechanism 1037, 1095 provided between the first temperature regulating unit 1091 and the second temperature regulating unit 1036. The present invention thereby provides an automated analyzing device and a method for operating an automated analyzing device with which it is possible for a temperature regulation state of a measuring system to be improved in comparison with a conventional example.

This invention discloses a method for coordinated wavelength correction of oxygen absorption in a TDLAS gas analyzer, comprising the following steps: S1, firstly, extracting the second harmonic signal of oxygen using wavelength modulation spectroscopy technology with the TDLAS gas analyzer; S2, analyzing the second harmonic signal of oxygen absorption to extract the absorption peak amplitude and position information; S3, determining whether the center wavelength has shifted, i.e., whether the absorption peak amplitude has deviated from the preset range. If yes, proceed to step S4; otherwise, return to step S1; S4, if the absorption peak amplitude has deviated, using a coordinated control algorithm of temperature control coarse adjustment and current fine adjustment for correction. This invention eliminates the need for a reference gas chamber and spectroscopic structure, maintaining simplicity and reliability in hardware; it also avoids the problems of traditional harmonic peak search being susceptible to noise interference and response lag, enabling fast, stable, and high-precision automatic wavelength correction under complex operating conditions, effectively improving the long-term measurement stability and detection accuracy of the TDLAS gas analyzer.

The invention discloses a discharge consistency fault detection method for a defibrillation pace-making analyzer, and belongs to the field of medical equipment testing and signal processing. Acquiring a voltage and current sampling sequence of a single discharge process, and constructing an identifiable constraint equation based on the equivalent loop relation and the equivalent energy storage state equation; solving through a weighted least square inversion algorithm to obtain an equivalent energy storage parameter and a series loss parameter; respectively calculating a dynamic consistency residual error representing process dynamic characteristics and an energy conservation residual error representing energy closed-loop balance; optionally calculating a phase consistency residual for the biphase waveform; and performing normalization and weighted fusion on each residual error to form a comprehensive fault score, judging a fault according to a threshold value, and outputting the confidence coefficient of the credibility of a quantized conclusion at the same time. According to the method, through multi-physical principle consistency joint checking, hidden faults which are difficult to find in traditional single-index detection can be effectively recognized, and the method has the advantages of being resistant to measurement distortion interference and high in conclusion interpretability.

This invention discloses a method, apparatus, computer device, and storage medium for determining noise caused by SSDs. The method includes: connecting the terminal to a PCIe protocol analyzer while the terminal is in battery-powered mode and recording the PCIe trace of music playback; determining the latency of the SSD responding to host commands in low-power mode based on the PCIe trace; determining whether the latency is greater than a set threshold; and if the latency is greater than the set threshold, determining that the SSD causes system audio noise. By implementing the method of this invention, it is possible to automatically determine whether an SSD will cause system audio noise.

A device and method for measuring the half-wave voltage of a phase modulator, belonging to the field of optical fiber communication technology, solves the problems of complex structure, low accuracy, high cost, and complicated measurement methods in existing technologies for measuring the half-wave voltage of phase modulators. The device of this invention is very simple to set up, does not require judgment of extreme values, the system is stable and not easily affected by external factors. It is only necessary to adjust the voltage output of the second channel of the waveform generator and observe the change of polarization state in the polarization analyzer. The half-wave voltage can be measured by observing the polarization state measured by the polarization analyzer rotating half a circle on the Poincaré sphere. There is no need to manually adjust the polarization controller to maximize the optical power, nor is it necessary to judge the maximum and minimum values ​​of the optical power meter. The measurement device can measure the value of the half-wave voltage of the phase modulator, and the measurement is more stable and accurate.

Method for analyzing a measurement object, where n is a number greater than or equal to 1, comprising the following steps: - Generating a generator signal, - Direct forwarding of the generator signal to an input switch (2), - Forwarding the generator signal as a leading wave to a coupling unit (3.1, 3.2, 3.3, 3.4) selected by means of the input switch (2), - Tapping a reference signal (a x = i,j,k,l ) from the leading wave in the coupling unit (3.1, 3.2, 3.3, 3.4), - Forwarding the leading wave to a measuring object, - Return of a wave reflected from the object under test to the selected coupling unit (3.1, 3.2, 3.3, 3.4) and extraction of a corresponding return signal (b x = i,j,k,l ) from the returning wave through the selected coupling unit (3.1, 3.2, 3.3, 3.4) and / or - Transmission of a wave transmitted through the object under test to another coupling unit (3.1, 3.2, 3.3, 3.4) and extraction of a corresponding transmission signal (b x = i,j,k,l ) from the transmitted wave through the other coupling unit (3.1, 3.2, 3.3, 3.4), - Feeding in the tapped signals (a x = i,j,k,l , b x = i,j,k,l ) to a single measuring point (5) via a coupling switch (4), - Separating and demodulating the tapped signals (a x = i,j,k,l , b x = i,i,k,l ) at the measuring point (5) and - Calculation of the behavior of the object being measured at the measuring point (5).

The utility model relates to the related technical field of spectrum analyzers, which comprises a spectrum analyzer, a supporting mechanism is arranged at the bottom of the spectrum analyzer, and an auxiliary component is arranged on the surface of one side of the supporting mechanism. According to the supporting device for the spectrum analyzer, in the process that the spectrum analyzer needs to be placed, a placing table is pulled in two opposite directions at the same time, so that a connecting plate slides out of a first sliding groove, then a limiting column is pressed, a spring is compressed, and therefore the limiting column is temporarily stored in a mounting groove; then, the height of the telescopic column is adjusted, after the telescopic column is adjusted to a proper position, the spring is reset, the limiting column is clamped into the limiting hole in one side of the supporting column, finally, the spectrum analyzer is placed above the placing table, and at the moment, the friction force between the spectrum analyzer and the placing table can be increased through an anti-skid pad, so that the spectrum analyzer is not prone to sliding.

The embodiment of the invention discloses a microphone output critical value measuring method and system, and belongs to the technical field of microphone testing. The method comprises free field sensitivity test and maximum sound pressure level conversion, and the free field sensitivity of a moving coil microphone / sound head to be tested is tested according to a standard method; inputting a tested stepping amplitude voltage signal to the moving coil microphone / sound head to be tested through a signal generator, and recording and collecting the output response of the standard measurement microphone; distortion rate calculation and judgment are carried out through the audio signal analyzer, and finally conversion of the maximum sound pressure level is carried out. According to the method, near-field test conditions are adopted, high-signal-to-noise-ratio sound pressure signal collection is achieved, meanwhile, the harmonic distortion rate is accurately calculated through the signal processing technology, it is ensured that data are accurately recorded when the specified distortion rate is reached, and the reliability of a test result is improved.

A computer having a system for mitigating mechanical noise resulting from mechanical coupling of an audio output transducer with a portion of the computer device, the system comprising: a processing subsystem, the processing subsystem is configured to receive an input audio signal and output a drive signal to drive the audio output transducer to produce a transducer output, wherein the processing subsystem is configured to selectively apply an attenuation function to the input audio signal to attenuate a signal component of the input audio signal at a frequency at which mechanical noise is generated in the computer; and an analyzer subsystem configured to receive the input audio signal and output a control signal to the processing subsystem to control application of the attenuation function to the input audio signal by the processing subsystem based on spectral content of the received input audio signal; wherein the attenuation function is based on a characteristic acoustic behavior of the computer.

The invention discloses a double-source excitation EDXRF analysis instrument based on spectrum zoning, and belongs to the technical field of analysis and detection instruments, the double-source excitation EDXRF analysis instrument comprises a vacuum measurement chamber formed by a sealed shell, a vacuum system, a sample carrying table, a detection unit, double excitation sources and a control processing module, the first excitation source is a rhodium target X-ray tube and is adaptive to light element excitation, and the second excitation source is a rhodium target X-ray tube and is adaptive to light element excitation; a second excitation source is a tungsten target X-ray tube, is adaptive to medium and heavy element excitation, is provided with an aluminum-copper composite optical filter, adopts a compact layout of double units, is matched with a circulating water cooling system and a graphene window SDD detector, and is matched with a spectrum partition design to physically separate double-source signals and a low-vacuum environment to guarantee light element transmission; the instrument solves the problem that a traditional single source cannot give consideration to full-spectrum excitation and spectrum overlapping interference, realizes high-sensitivity and high-signal-to-noise-ratio measurement of all elements from sodium to uranium, supports synchronization and time sequence dual modes, and improves the detection efficiency and precision.

This utility model belongs to the field of sound insulation measurement and discloses an automatic scanning sound intensity method for measuring sound insulation. Its features include: a computer with a human-machine interface, an Arduino microcontroller, a three-axis linear slide module, and a sound intensity analyzer. The computer is connected to the Arduino microcontroller, which is connected to the motor drivers of the three-axis linear slide module. The sound intensity probe of the sound intensity analyzer is fixed on the end slide of the three-axis linear slide module. This device can not only automatically execute the sound intensity probe scanning path, but also set parameters such as scanning speed and measurement surface size through the human-machine interface, and display the scanning line trajectory. This not only reduces the influence of manual measurement on the measurement results and improves measurement accuracy and reliability, but also makes operation simple and intuitive.