50results about How to "Wide spectrum range" patented technology

The invention belongs to the technical field of vibration environment testing and particularly relates to a general change-over vibration test clamp for a dynamoelectric vibrator. The general change-over vibration test clamp for a dynamoelectric vibrator comprises an installing plate and a back structure. The front surface of the installing plate is provided with four T-shaped grooves used for connecting with a to-be-tested test product. The four T-shaped grooves are also provided with installing holes. The surface of the installing plate is embedded with an M12 steel sleeve and an M20 steel sleeve. The invention solves the problem that as differences in shape and installing mode of vibration test products are large, some test products cannot be normally installed on the vibration platform, achieves connection between vibration test products of different shapes and installing modes and the vibration platform, supports a serial of vibration tests of vibration test pieces, and has certain versatility. The clamp primary frequency is high, the spectral range for vibration testing is wide, the dynamoelectric vibrator output is effectively reduced, and the practicality is strong.

The invention relates to the technical field of MEMS light modulators, in particular to an MEMS blazed grating light modulator and an array. The shutter type MEMS large-rotation-corner adjustable blazed grating light modulator comprises a silicon substrate, an insulating layer, a movable frame, flexible beams, a grating mirror plane, double-layer comb tooth drive structures, an elastic cantilever beam, a bias voltage exerting device and a plurality of columns, wherein the insulating layer, the movable frame, the flexible beams, the grating mirror plane, the double-layer comb tooth drive structures, the elastic cantilever beam, the bias voltage exerting device and the columns are arranged on the silicon substrate. One side of the grating mirror plane is fixed to the surface of the substrate through supporting beams and two of the columns, and the other side of the grating mirror plane is connected with the movable frame through a deformation beam and driven by the double-layer comb tooth drive structures. The bias voltage exerting device can exert drive voltages at different levels and different frequencies between movable teeth and fixed teeth, and therefore the movable teeth can deflect and move to drive the movable frame, and the movable frame pulls the grating mirror plane to defect through the deformation beam. Due to the structure, an MEMS blazed grating has the advantages of being large in rotation angle, adjustable in continuous analog, good in controllable capacity, high in diffraction efficiency, high in tuning efficiency and capable of preventing adhesion failure.

The invention discloses an optical fiber grating temperature detecting method and a device in the technical field of sensors. The method comprises the steps as follows: first, compositing optical signals in a set optical band to obtain a composite optical signal; then, importing the composite optical signal into an optical fiber grating temperature sensor to get a center wavelength optical signal; next, using an AOTF acousto-optic tunable filter to demodulate the center wavelength optical signal to obtain a demodulated center wavelength optical signal; and finally, working out the temperature measured by the optical fiber grating temperature sensor according to the demodulated center wavelength optical signal. According to the invention, optical signals of a set optical band are provided by a composite light source, and the spectral range of optical signals is expanded; and the AOTF acousto-optic tunable filter is adjusted by a radio frequency drive controller, a demodulated center wavelength signal corresponding to the set band can be extracted from optical signals returned by the optical fiber grating temperature sensor, the spectrum identification range of optical signals is expanded, and the requirements of a large-scale temperature sensing monitoring system can be met.

The dry-type high-frequency high-voltage transformer structure (1) of the present invention is characterized by comprising an EE-type magnetic core (2), a square skeleton (3), a square coil (4) and afixed support device (6) and further comprising a lead-out copper bar or copper wire (7) of the coil, wherein the EE magnetic core (2) is formed by installing two E-type magnetic cores (21) in such away that the openings of the two E-type magnetic cores are opposite to each other and the two E-type magnetic cores are aligned in the vertical direction; the square skeleton (3) sleeves the central pillar of the EE-type magnetic core (2); the square coil (4) is a vertical structure and is formed by winding a combination of a low-voltage coil (41) and a high-voltage coil (42) around the square skeleton (3); and the high-voltage coil ( 42) and the low-voltage coils are alternately wound around the square skeleton (3). The dry-type high-frequency high-voltage transformer structure solves the performance defects of low transmission capacity, low step-up voltage, low efficiency, incapability of long-term operation and low reliability in the current high-frequency and high-voltage fields such that a high-frequency and high-voltage power supply can be used widely and reliably.

Disclosed is a method for generating a frequency doubling Ince-Gaussian light beam. Based on a nonlinear optical calculation holographic theory, phase and amplitude information of an IG light beam areintroduced to a hologram definition equation, and a hologram carrying IG light beam optical filed distribution is made by MATLAB programming; by adopting a mask-free photoetching method, the hologramis transferred to an LN crystal thin film to prepare a hologram domain structure in the LN crystal thin film; the surface of the LN crystal thin film is plated with a layer of metal Cr by adopting anelectron beam evaporation method, and then stripping is performed to form a patterned electrode needed by polarization; preparation of the domain structure is realized by adopting a probe pressurizing method; and femtosecond laser is pumped to the domain structured LN crystal thin film to generate the frequency doubling light beam in first-order diffraction position of a far field. By virtue of the method, processes of light beam shaping and frequency conversion are realized synchronously, and advantage of integration is realized.

The invention discloses a fan and electronic equipment. The technical problem that the noise of a fan in the prior art is too large is solved. The fan comprises a base, a stator and an impeller. The stator is fixedly arranged on the surface of the base. The impeller is rotatably arranged on the periphery of the stator and comprises at least two fan blades including a first fan blade and a second fan blade, and the first fan blade and the second fan blade are different in structure. Due to the fact that the impeller comprises the two fan blades different in structure, the frequency spectrum of sound waves of the noise of the fan is partially offset and is distributed within the wider range, the peak value of the sound waves under the single frequency spectrum is lowered, and then the technical effect of lowering the fan noise is achieved.

The invention discloses an optical frequency comb generation device, which comprises a tunable laser, a micro-nano optical fiber and a peanut-shaped resonant cavity, laser emitted by the tunable laser is coupled into the peanut-shaped resonant cavity through the micro-nano optical fiber and forms an optical frequency comb, and the peanut-shaped resonant cavity is prepared by melting and compressing a single-mode optical fiber twice. The outline of the peanut-shaped resonant cavity is in axial symmetry, the peanut-shaped resonant cavity comprises a first bottle-shaped optical microcavity and a second bottle-shaped optical microcavity which are coaxially arranged in the axial direction of the peanut-shaped resonant cavity, and the first bottle-shaped optical microcavity and the second bottle-shaped optical microcavity are partially overlapped in the axial direction. The invention also provides a light source frequency stabilization system and a method of the atomic magnetometer. The comb tooth interval of the optical frequency comb obtained by the optical frequency comb generation device is as low as 0.1-1GHz, dispersion is easy to adjust, and the light source frequency stabilization system and method of the atomic magnetometer based on the optical frequency comb generation device realize high-precision and high-frequency-stability light source output of the atomic magnetometer.

The invention discloses a self-excited converter, and belongs to the technical field of power supplies. The self-excited converter is invented to generate stable and higher oscillation frequency by adding a resistor, an inductor and a capacitor on the basis of the prior art and creating a wiring method among the resistor, the inductor, the capacitor and a switching tube, so that ripple voltage output by an output end is lower, the size of a high-frequency transformer can be reduced, and the manufacturing cost is reduced.

The invention discloses a converter valve test system based on high voltage square wave pulse excitation. The system includes a high voltage square wave pulse generating unit, a first voltage dividingunit, a second voltage dividing unit, a standard impedance and data collecting unit and a sample. The present further discloses a converter valve test method based on high voltage square wave pulse excitation. The system is advantaged in that measurement accuracy can be improved through utilizing high-voltage square-wave pulses instead of sinusoidal pulses in a conventional test system, moreover,characteristics of the high-voltage square wave pulses can be utilized to obtain the impedance spectrum information in the higher frequency domain range in the test, and test efficiency is improved.