67results about How to "Increased measurement bandwidth" patented technology

The present invention provides a micro sensor for monitoring the cleaning and drying processes for very high aspect ratio micro channels in dielectric films oriented parallel to the fluid-solid interface during the manufacture of ICs, MEMS and other micro-devices. The micro sensor can be used to monitor “vertical” micro features common in microelectronics fabrication or “horizontal” micro features found in MEMS or microfluidic fabrication. By forming the micro channels parallel to the interface, the channels can be made with much higher and well controlled aspect ratios. In addition, multiple sensors can sense the impedance at various points along the micro features. The addition of a guard reduces the effects of any parasitic capacitance, which extends the measurement bandwidth of the sensor.

The invention discloses a system for GIS (Global Information System) partial discharge measurement and VFTO (Very Fast Transient Overvoltage) measurement in the technical field of online monitoring systems of electric equipment. The system comprises a probe, a circuit selector, a partial discharge detection amplifying unit, a VFTO secondary partial pressure unit, a signal collecting and processing unit and an oscilloscope. The measurement system can use one probe to perform GIS partial discharge and VFTO measurement, and the two original systems are combined to the same system to reduce the GIS monitoring cost; the special probe design improves the measurement sensitivity of partial discharge; and the preferable VFTO secondary unit design improves the glancing flatness of wide frequency band measurement of a VFTO sensor.

The invention discloses a TMR accelerometer based on gap change. The accelerometer comprises a top structure, a bottom structure and first and second anchor points, and the top structure is supported over the bottom structure via the first and second anchor points arranged at the two ends of the bottom layer respectively. The accelerometer detects acceleration signals by utilizing a high-sensitivity TMR effect, has the advantages of low saturated magnetic field, small working magnetic field, high sensitivity, low temperature coefficient, large measuring bandwidth and the like, and is also simple and compact in structure, smaller in size and high in measuring precision.

The invention discloses a system for Young modulus measurement of a film. The system comprises a pulsed laser, wherein the pulsed laser emits pulse laser, which is divided into 7/10 pulse laser and 3/10 pulse laser by a 3:7 spectroscope after being collimated and broadened by a first beam expander, and the 7/10 pulse laser is focused on the surface of a sample under test through a cylinder focusing lens to generate an acoustic surface wave signal under excitation; and the acoustic surface wave signal is converted into an electrical signal through a first detection channel and/or a second detection channel, and the electrical signal is output to a computer for processing after being displayed by an oscillograph. The system not only has the advantages of large signal amplitude, high applicability in testing environment with large disturbance and the like of the piezoelectric laser acoustic surface wave detection technology, but also inherits the advantages of rapid, accurate and non-contact measurement and high signal to noise ratio and the like of the difference confocal laser acoustic surface wave detection technology; and the system has higher applicability and wider range of applicability. Meanwhile, based on the advantage of high measurement bandwidth of the difference confocal laser acoustic surface wave detection technology, the measurement resolution is greatly improved.

The present invention provides a micro sensor for monitoring the cleaning and drying processes of surfaces of dielectric films, micro features in porous dielectric films and biologic or other cells common in microelectronics fabrication, MEMS fabrication or microbiology test system fabrication. By embedding electrodes in the surface of a supporting dielectric, the sensor can probe the surface and pores of a covering dielectric or a cell on the covering dielectric. The addition of a guard reduces the effects of any parasitic capacitance, which extends the measurement bandwidth of the sensor and allows it to be manufactured at the scale of a single cell, a feature that is particularly important for applications in microbiology.

The invention discloses a sensitive probe and a precise vertical spring portable type gravity meter. The sensitive probe at least comprises a swing body and an insulating electrode frame. The electrode frame comprises a bottom opening, an erect cylinder, an insulating frame body and an insulating plate. The shape of the insulating plate is identical with the shape of the top of the frame body. The shape of the swing body is identical with that of the frame body. Even number pairs of electrode plates are plated on the lateral wall of the frame body. At least one pair of electrode plates are plated on the top wall of the frame body and the insulating plate. The swing body is located between the top wall of the frame body and the insulating plate. The distances from the swing body to all the electrode plates are equal. The gravity meter uses the sensitive probe and is a high-precision vertical-swing clinometer, relative gravity acceleration and two-dimensional crustal inclination signal measuring are achieved at one step, and double functions of an existing high-precision gravity meter and an clinometer are achieved.

The invention discloses an AC/DC zero-flux fluxgate current sensor, which comprises a fluxgate current sensor body and a configuration and calibration circuit for configuring and calibrating the fluxgate current sensor body. The fluxgate current sensor body comprises a first iron core, a second iron core, an excitation winding, a feedback winding and a measurement winding. The configuration and calibration circuit comprises a processor, a crystal oscillator, an RS232 interface circuit, an excitation source amplification drive circuit, a programmable compensation signal tracker, a programmablefilter, a phase-sensitive demodulation circuit, a PI control circuit and a power amplifier. The invention discloses a program control configuration and calibration method of an AC/DC zero-flux fluxgate current sensor. According to the invention, the offset current caused by inconsistent parameters of the two iron cores can be automatically matched, the requirement on the process consistency of thetwo fluxgate iron cores can be greatly reduced, the optimal performance of the fluxgate sensor can be realized, the practicability is strong, and the popularization and use values are high.

The invention discloses an optical fiber acoustic vibration sensor based on a gold-plated vibration film and a manufacturing method thereof. The optical fiber acoustic vibration sensor comprises a vibrating diaphragm (1), a single-mode optical fiber (3) having the end surface containing a tantalum pentoxide coating, and a supporting structure of a sensing head; a gold plating layer (4) is arrangedon the inner surface of the vibrating diaphragm (1); and a through hole (2) is arranged between the vibrating diaphragm (1) and the single-mode optical fiber (3) with the tantalum pentoxide coating on the end face. The supporting structure of the sensing head is composed of the through hole (2), a D-shaped tube (5), a capillary tube (6) and an epoxy resin adhesive layer (7), and a resonance microcavity is formed between the single-mode optical fiber (3) with the tantalum pentoxide coating on the end face and the vibrating diaphragm (1). According to the invention, the high reflectivity is effectively ensured, the effective measurement bandwidth is improved, and the interference signal quality is improved.

The present invention includes a guided microwave spectroscopy system (1) that eliminates the need for an automatic gain control feature by providing multiple signal processing paths having differing fixed voltage gains. An emitted signal which exits a test chamber (2) containing a material under test is simultaneously amplified by at least a first fixed gain amplifier (4) and a second fixed gain amplifier (7). The output signal of each amplifier is separately digitized and then normalized for further digital signal processing by a computer (13) in order to determine parameters of the material under test which may have variable microwave radiation characteristics that are a function of the frequency of the signal emitted into the test chamber. During the signal processing step a system clock (121) causes the computer to sample only an integral number of complete output signal cycles. A calibration protocol (136-154) is conducted based on laboratory samples of each potential material to be processed by the system (1).

The invention relates to a laser gyroscope offset frequency method based on external cavity feedback. The method particularly comprises the following steps of: establishing a feedback external cavity outside a laser gyroscope cavity, and reflecting clockwise beams into a laser resonant cavity; and arranging a nonreciprocal optical device in an external cavity light path, so that feedback light waves of clockwise and anticlockwise light waves have phase difference, and frequency offset is established between the clockwise and anticlockwise light waves of the laser gyroscope. A path length modulation part is arranged in the feedback external cavity light path, and the external cavity light path is modulated, so that the frequency offset of the laser gyroscope is modulated, and an effect similar to mechanical dither is obtained. A modulation signal in a laser gyroscope reading device is filtered by employing a filtering technology, so that an angular velocity signal of laser gyroscope measurement is obtained. According to the method, mechanical noise is not generated, and extremely high modulation frequency can be adopted, so that a response speed of the laser gyroscope is increased.

The invention relates to an X-ray pulsar navigation method based on a dynamic pulse accumulation window, belongs to the fields of spacecraft guidance, navigation and control, and is different from a mode that an X-ray pulsar photonic signal is subjected to fixed window accumulation in a present X-ray pulsar navigation method. The X-ray pulsar navigation method provided by the invention adopts the dynamically arranged pulse accumulation window, so that the position of the accumulation window can be synchronously regulated with a filtering recursive calculation process according to the needs of a signal accumulation signal-to-noise ratio and observation updating frequency along with the update of the X-ray photon pulse sampling; meanwhile, pulse profile cumulative data is updated, and the navigation observation updating frequency is improved. According to the X-ray pulsar navigation method, the problems that the random error cannot be effectively restrained, the orbit extrapolation error has great influence, the arrangement of the pulse accumulation window is inflexible and the like in the traditional X-ray pulsar photonic signal fixed window accumulation mode are effectively solved, and the navigation accuracy and stability are improved.

The invention relates to a method and a system for achieving real-time measurement of big bandwidth optical signal radio frequency spectrums. The system comprises an ultrashort pulse source, a first big chromatic dispersion unit, a polarization controller, an optical coupler, a non-linear device, an optical filter, a second big chromatic dispersion unit, a photoelectric detector and a real-time oscilloscope. According to the invention, when the radio frequency spectrum of the signal is changed from the MHz to the GHz, real-time measurement of the frame rate speed can be achieved directly on the radio frequency information of a to-be-measured signal in the time domain; by directly converting the radio frequency measurement of light carriers from the measurement in the electrical domain into the measurement in the optical domain, broadband limitations of the photoelectric detector are avoided; and the method and the system are characterized by capability of measuring the big radio frequency broadband of 100GHz or above.

The embodiment of the invention provides a multi-band wireless channel measurement calibration method and system. The method comprises the steps of establishing a single-path calibration channel, and performing single-path calibration channel measurement of N continuous bands, wherein the N is more than or equal to 1; obtaining the amplitude-frequency response of each band, and obtaining amplitude calibration data through amplitude-frequency calibration processing; obtaining the phase frequency response slope of each band, and obtaining sampling error calibration data according to the phase frequency response slope; obtaining the non-linear phase in each band, and obtaining non-linear phase calibration data through non-line phase calibration processing; measuring a practical channel through adoption of the N continuous bands, thereby obtaining the frequency domain response of each band of the actual measurement channel; and calibrating the frequency domain response of each band of the actual measurement channel according to the amplitude-frequency calibration, the sampling error calibration data and the non-linear phase calibration data. According to the method and the system, on the premise of not increasing hardware costs, the measurement bandwidth is multiplied, and the higher delay resolution is obtained.

The invention relates to a high-potential current acquisition system with a rain-proof function, which comprises a data acquisition box, a data receiving device and a trigger device, wherein the dataacquisition box comprises a shielding box, a data acquisition case and an adjustable resistor, the data acquisition case and the adjustable resistor are installed in the shielding box, the shielding box is connected with a high voltage wire and hung on a cross arm through an insulator, one end of the adjustable resistor is electrically connected with the shielding box, the other end is electrically connected with a discharge electrode below the shielding box through a conductive copper strip which is externally provided with an insulating layer, a resistance control line and a voltage measurement cable of the adjustable resistor are connected with the data acquisition case, and the data acquisition case exchange information with the data receiving device and the trigger device through an optical fiber. According to the invention, the data acquisition part of the high voltage side is placed in the metal shielding box, and information transmission between the high voltage side and the low voltage side is realized through the optical fiber, thereby not only being capable of shielding various types of electromagnetic interference and ensuring the electrical insulation between the highvoltage side and the low voltage side, but also being suitable for being used in a rain condition and creating favorable conditions for the research on air gap discharge under the raining state.

The invention discloses a wideband GIS electronic voltage transformer device and a measurement method. The device comprises a built-in measurement electrode module, a conditioning module, a sampling module and a control module, wherein a measurement electrode of the built-in measurement electrode module is arranged in a GIS hand hole, and the measurement electrode penetrates through a GIS shell through a wire to be connected with a forward input end of a wideband amplifier of the conditioning module; a conditioning resistor and a conditioning capacitor of the conditioning module are connectedin parallel between a negative input end and a negative output end of the wideband amplifier; the sampling module performs analog sampling and analog-digital conversion to obtain a digital output voltage; and the control module calculates a GIS primary voltage value according to a voltage division ratio and the digital output voltage. Through the device and the method, electrode size miniaturization is realized, measurement bandwidth is expanded, transient characteristics are improved, the voltage transformation ratio is easy to regulate, and it is not needed to set secondary voltage division.

The invention relates to an optical fiber current sensor for realizing non-reciprocal dynamic phase modulation. The optical fiber current sensor comprises a low-polarization SLED light source, an optical fiber coupler, an optical fiber polarizer, a straight waveguide phase modulator, a Faraday rotator, a polarization-maintaining transmission optical cable, an optical fiber sensing ring, a detectorand a signal demodulation electronic unit, wherein the low-polarization SLED light source is connected to the optical fiber coupler through a single-mode optical fiber; and the optical fiber coupleris welded with the optical fiber polarizer. The invention also relates to a signal demodulation method for realizing non-reciprocal dynamic phase modulation. The optical fiber current sensor for realizing non-reciprocal dynamic phase modulation and the corresponding signal demodulation method are adopted, modulation of fixed phase bias can be achieved, modulation of dynamic feedback can also be achieved, noise caused by frequent modulation of the current sensor can be lowered, small signal measurement precision can be improved, meanwhile, high measurement bandwidth can be obtained, dynamic modulation can be conducted according to the magnitude of current detected in real time, and the measurement range of the current sensor is widened.

The invention discloses a high-dynamic force balance control method of an MEMS (micro-electro-mechanical system) resonant gyroscope. The method approximately comprises steps as follows: firstly, an augmentation form of a gyroscope resonant model is obtained and serves as a calculation model of an MPC (model predictive controller); then, the optimal balance force sequence is calculated in real timeat each sampling moment under the condition that balance force output constraint of the controller is met , and a first value of a vector of the sequence is taken as a controlled variable of the nextmoment. Such cycle calculation is performed, and finally, one optimal balance force sequence can be obtained, so that output of the gyroscope resonant model approaches a resonant output given value,coriolis force is counteracted, and force balance is realized. Accurate control of amplitude and frequency of the MEMS resonant gyroscope can be realized, accurate modal drive is provided for the gyroscope, and measurement accuracy and stability of the gyroscope are guaranteed. Meanwhile, the dynamic range and the measurement bandwidth of the gyroscope are enlarged, linearity and anti-jamming capability of scale factors are improved, and the sensitivity and the overall performance of the MEMS resonant gyroscope are improved.

The invention discloses a broadband AC/DC current measuring device, which comprises two iron core frameworks, a non-magnetic framework, four windings and an affiliated compensation circuit, a double-iron-core structure self-oscillation fluxgate sensor and a Rogowski coil current sensor structure are combined, a direct current magnetic flux compensation circuit is matched, alternating current detection can be completed, direct current detection can also be completed, and the double-iron-core structure fluxgate method current sensor is used for measuring low-frequency current. The Rogowski coil current sensor is used for measuring the power frequency current, the current measurement bandwidth is greatly widened, and the detection precision of the alternating current containing the direct current component is superior to that of an electromagnetic current sensor. Meanwhile, when the low-frequency current is measured, the measurement precision of the low-frequency current can be effectively improved through a direct-current magnetic potential compensation and excitation frequency adjustment method. Therefore, the technical problems that when alternating current and direct current are measured in the prior art, high-frequency and low-frequency alternating current and direct current measurement cannot be considered at the same time, and the measurement error is large are solved.

A radar system is disclosed for detecting profiles of objects, particularly in a vicinity of a machine work tool. The radar system uses a direct digital synthesiser to generate an intermediate frequency off-set frequency. It also uses an up-converter comprising a quadrature mixer, single-side mixer or complex mixer to add the off-set frequency to the transmitted frequency. It further uses a down-converter in the receive path driven by the off-set frequency as a local oscillator. The radar system enables received information to be transferred to the intermediate frequency. This in turn can be sampled synchronously in such a way as to provide a complex data stream carrying amplitude and phase information. The radar system is implementable with a single transmit channel and a single receive channel.

The invention discloses a phase modulator frequency response measurement method. Microwave signals are modulated on optical carriers by using a phase modulator to be measured so as to generate optical phase modulation signals; the optical phase modulation signals are enabled to pass through a standard optical device so that at least partial optical phase modulation signals are enabled to be converted into optical intensity modulation signals; the output optical signals of the standard optical device are converted into electric signals by using a standard photoelectric detector and the amplitude and phase information of the electric signals is extracted, wherein the frequency response of the amplitude and the phase of the standard optical device and the standard photoelectric detector is known; the frequency of the microwave signals is changed and the process is repeated so that the combined frequency response of the amplitude and the phase of the phase modulator to be measured, the standard optical device and the standard photoelectric detector can be obtained; and finally the amplitude and phase response of the standard optical device and the standard photoelectric detector is removed from the combined frequency response so that the amplitude and phase frequency response of the phase modulator to be measured can be obtained. The invention also discloses a phase modulator frequency response measurement device.