39 results about "Pockels effect" patented technology

The invention discloses a terahertz pulse measurement-based burning temperature sensing device and a terahertz pulse measurement-based burning temperature sensing method. Laser is emitted from a femtosecond laser device, and is divided into reference laser and detection laser through a beam splitter, the detection laser is focused on a photoconduction antenna type terahertz emitter, terahertz pulses emitted by the terahertz emitter are focused on a ZnTe crystal through an off-axis paraboloid lens group; and the reference layer is collimated and is coincident with terahertz waves focused on the ZnTe crystal after passing through a semi-transmission and self-reflection mirror, parallel grating groups and a polarizing film, the terahertz waves are modulated by using Pockels effect of the ZnTe crystal, and image signals corresponding to collected first reference layer carrying terahertz pulse strength information and second reference laser not carrying the terahertz pulse strength information are input into a computer by a CCD (Charge Coupling Device) detector for subsequence processing. According to the invention, the precision and speed of the non-contact combustion measurement method are increased, and the non-contact measurement of combustion object temperature and temperature distribution is realized.

The invention discloses an optical voltage transformer which is composed of a light source, a coupler, a polarizer, a phase modulator, a polarization delay optical cable, a collimating lens, a faraday rotary mirror, an electro-optical sensing unit, a photoelectric detector and a signal processing module, wherein the electro-optical sensing unit is composed of a bismuth germinate and an A and a B electrodes which are respectively installed on an upper and a lower panels of the bismuth germinate. The invention adopts the technical proposal that an electric field leads to the change of the refractive index of the sensing bismuth germinate in the electro-optical sensing unit, the phase difference of two cross-line polarized lights passing through the bismuth germinate is changed due to the Pockels effect, and the magnitude of the electric field can be indirectly measured by measuring two coherent lights.

The invention relates to an electric field intensity measuring system based on the Pockels effect. The system comprises a polarizer, a 1/4 wave plate, a Pockels crystal and an analyzer, and the polarizer, the 1/4 wave plate, the Pockels crystal and the analyzer are sequentially arranged along a light path. The polarization direction of the polarizer and the polarization direction of the analyzer are orthogonal. The system further comprises a light source, optical fibers and a post-processing unit. The optical fibers comprise a light incoming side optical fiber and a light emitting side optical fiber. The post-processing unit comprises a photoelectric detector and an oscilloscope, and the photoelectric detector and the oscilloscope are connected. A scheme for solving the problem that a traditional optical discrete device is not practical is disclosed. A Pockels probe is formed after binding relative components of the measuring system such as the polarizer, the analyzer, the 1/4 wave plate, the Pockels crystal and an optical fiber collimator. The system solves multiple problems that light paths are not easy to control by a traditional system based on the optical discrete device, the system is prone to being interfered by outside conditions and system stability is poor, promotes the optical electric field measuring technology to be converted to actual application, and promotes development of the electric field measuring technology.

The invention belongs to the technical field of surface charge accumulation characteristic testing of high-voltage direct current solid insulating material, and in particular relates to a measuring device of direct-current GIL basin-type insulator surface charge based on Pockels effect. The measuring device comprises a helium-neon laser, a polarized light separator, a high-speed camera, a 1/8 valve plate, bismuth silicate crystal, an insulating vacuum tube, a sliding block, a rotating shaft and an insulating guide rod. When measuring is conducted, a bismuth silicate probe is stuck to the surface of an basin-type insulator, a red laser is emitted from the helium-neon laser, the red laser is turned into elliptically polarized light through the polarized light separator and the 1/8 valve plate, the light entries into the bismuth silicate probe and is reflected at a division surface of bismuth silicate and the basin-type insulator, the light penetrates the 1/8 valve plate again and enters the high-speed camera after right-angle refraction is conducted on the light, optical intensity distribution is measured, and the size of the quantity of electric charge is acquired after being processed by a computer. The measuring device has the advantages that the structure is simple, the operation is convenient, and efficient measuring means is provided for studying of direct-current GIL basin-type insulator surface charge accumulation.

The invention provides an optical VFTO measurement system based on the Pockels effect. The system comprises a VFTO optical sensor (4), a bus guide rod (3) and basin-type insulators (2) with the same center, wherein the VFTO optical sensor (4) is arranged on a cylindrical GIS tank (1) and the bus guide rod (3) is coaxially arranged in the GIS tank (1). The optical sensor (4) is connected with a signal collecting processor (8). The optical VFTO measurement system has the advantages that the measurement bandwidth is large, the anti-jamming capacity is high, and the insulation level is high, the optical VFTO measurement system can be used for measuring the VFTO generated by motion of a disconnecting switch in a GIS, the characteristic parameters of the VFTO are analyzed, and the propagation characteristic of the VFTO is studied.

The invention discloses a high-precision resonant optical voltage sensor and a detecting method and belongs to the technical field of optical voltage sensing. The optical voltage sensor comprises a narrow linewidth laser source, a Y waveguide, a BGO crystal, dual detectors and a signal detection circuit which are sequentially connected through polarization maintaining optical fibers. The front light transmitting surface and the rear light transmitting surface of the BGO crystal are coated with films to form a high-definition resonant cavity, and the Pockels effect is improved through multiple times of transmission of light in the resonant cavity. According to the detecting method of the optical voltage sensor, by means of a resonant light path for dual path tracking, the resonant frequency difference of the two beams of light is synchronously detected, interference caused by the temperature change of the two beams of light at the same moment is consistent, the interference variables of the two beams of light in the propagation process are offset, and the improved Pockels effect is reserved. The measuring precision, temperature stability and environment adaptability of the optical voltage sensor are improved, the contradiction of high precision of miniaturization of the voltage sensor is solved, light path devices are reduced, and the structure is simple and reliable.

An apparatus and process is provided to illustrate the manipulation of the internal electric field of CZT using multiple wavelength light illumination on the crystal surface at RT. The control of the internal electric field is shown through the polarization in the IR transmission image under illumination as a result of the Pockels effect.

The invention discloses a compressed super-speed photographing device based on an electro-optic crystal deflection, and belongs to imaging devices in the field of computational imaging. The principleof the device comprises the steps of: encoding a dynamic scene image by means of a digital micro-mirror device; deflecting information arriving at the electro-optic crystal at different times to different positions by POCKELS effect of the electro-optic crystal, and imaging in a CCD camera after stacking; and performing image reconstruction using an augmented lagrangian algorithm. In the present invention, a glan prism, a first convex lens, and a digital micro-mirror device are sequentially placed after the position of dynamic scene. An electro-optic crystal, a second convex lens, a third convex lens, and a CCD camera are sequentially placed in the light path reflected by the digital micro-mirror device. The acquisition result of the camera is finally output to a computer terminal. According to the compressed super-speed photographing device based on the electro-optic crystal deflection, a super-speed dynamic process can be reconstructed by performing single shot on non-repeated event.

The invention discloses a system and method for surface charge dynamic distribution measurement in dielectric barrier discharge. The system includes a plane electrode structure discharge unit, a He-Nelaser source, a beam amplifier, an aperture, a 1/8 wave plate, a polarization beam splitter, a convex lens, a micropore and a high-speed camera. The plane electrode structure discharge unit includesa BSO measuring unit, a high voltage electrode, an insulating support and a ground electrode. The BSO measuring unit includes a BSO crystal, BK7 glass and an ITO transparent electrode. The BSO crystalis glued on the BK7 glass and the other side of the BK7 glass is coated with the ITO transparent electrode. The aperture, the polarization beam splitter and the 1/8 wave plate are fixed on an identical optical guide rail. According to the system and method for surface charge dynamic distribution measurement in dielectric barrier discharge, based on the Pockels effect, the dielectric surface charge dynamic distribution is achieved by recording the light intensity of reflected light carrying electric field information. The system has high measurement sensitivity and resolution and no requirement on the light transmission performance of a barrier material, and is helpful for deep research on the dielectric barrier discharge from the perspective of surface charge dynamic distribution.

The invention discloses a novel non-intrusive all-fiber reciprocity type voltage electric field sensor. The optical path system comprises a light source, a polarization-maintaining coupler A, a Y waveguide, a polarization-maintaining coupler B, a polarization-maintaining delay optical fiber, a 45-degree optical rotation mirror, a collimator, a lithium niobate waveguide and a reflector, which are sequentially connected through optical fibers. The Pockels effect of the lithium niobate waveguide is utilized to achieve sensitivity to a measured voltage electric field. In the optical path, polarization maintaining optical fiber is used for connection before the 45-degree optical rotation mirror, and then low-polarization optical fiber is used for connection, so that it is guaranteed that two pieces of orthogonal linearly polarized light participating in interference pass through the same optical path in the optical path, and reciprocity of the optical path is achieved. The all-fiber reciprocity type sensitive optical path does not need equal length of two sections of optical fibers, so that the requirement of the system on the process is reduced; the reciprocity ensures the measurementprecision and stability of the system; and the environmental adaptability and the anti-interference capability of the system are improved through all-fiber connection. According to the invention, thesensing head is integrally packaged by using an integrated optical process technology, so that the practicability of the sensor is improved.

The invention discloses an achieving method for dynamically controlling slow light of a photonic crystal. The method comprises the steps that a, qualitative parameters are initiated; b, under the condition of high group refractive index and low dispersion, a slow light waveguide device has a flat and wide-band slow light effect, the speed of a slow light group with the effect varies according to control of an impressed voltage in a large range, and thus the flat and wide-band slow light effect is obtained; c, a slow light effect with wide band and low dispersion is obtained under the context that ng is kept stable in the range that the absolute value of delta ng is smaller than or equal to 10%; d, the low dispersion characteristic of the slow light and the relation between the bandwidth and group refractive index are obtained; e, the refractive index change of an organic polymer with an electrooptical effect is mainly affected by a Pockels effect, and the variable amount of the refractive index is dependent on the secondary-order magnetic susceptibility of a material; f, under the effect of a light field local area, the valid secondary-order polarizability of the organic polymer is effectively improved. The achieving method solves the problems that the refractive index position and the group speed of a supported optimal wide-band slow light group cannot dynamically vary after preparation of slow light waveguide is completed.

Provided is a full optics differential monitoring device based on Pockels effects. The invention relates to the field of optics control and solves the problems that light beams are severely interfered by electromagnetic in the detection process of a present detection apparatus and the accuracy is low when digital signals are used to judge the deflection angle of lights. A first polarized light beam is obtained when a first incident light beam of the monitoring device is transmitted by a first electric light crystal. The first polarized light beam is divided into a reflected light beam and a transmitted light beam through number one semitransparent mirror. The reflected light beam emits in the direction vertical to the optical axis of the first polarized light beam. A second polarized light beam is obtained when a second incident light beam of the monitoring device is transmitted by a second electric light crystal. The second polarized light beam is reflected by a number one total reflective mirror to obtain another reflected light beam which gathers at the light input terminal of a photoelectric detector with the transmitted light beam transmitted by the number one semitransparent mirror. The invention can be widely applied to the field of light control.

The invention relates to an electro-optical modulation device used for laser energy modulation in the laser pulse shot blasting technology, and is of a multi-layer film structure on the surface of a prism. The electro-optical modulation device used for the laser energy modulation in the laser pulse shot blasting technology comprises a first metal film, an electro-optical polymer film, a second metal film and a buffer layer, wherein the refractive index of the prism is higher than those of the first metal film, the second metal film, the buffer layer and the electro-optical polymer film. According to the electro-optical modulation device used for the laser energy modulation in the laser pulse shot blasting technology, which is disclosed by the invention, the Pockels effect and the Kerr effect of the conjugated polymer material are simultaneously utilized. Under the condition that the modulation voltage is not changed, direct-current bias voltage is introduced to increase the modulation degree of the device. The electro-optical modulation device used for the laser energy modulation in the laser pulse shot blasting technology is especially suitable for the laser pulse shot blasting reinforcement and formation technology, and the fine regulation of laser light spot energy is realized by regulating the direct-current operating bias voltage of a modulator.

Epoxy/MMT composite material and a crosslinking method for epoxy/MMT composite material with second order nonlinear optical properties are introduced. Chromophore-containing intercalating agents are applied to modify montmorillonites (MMTs) to form organoclays by an ion-exchange process, wherein the chrmophores are neatly packed on exfoliated epoxy/organoclay nanocomposites. As a result, optical nonlinearity, i.e. the Pockels effect is observed for the nanocomposites without resorting to the poling process due to self-assembly process. Furthermore, a series of epoxy/MMT nanocomposites comprising thermally reversible furan-norbornene Diels-Alder adducts are prepared to establish a crosslinking feature. Self-alignment behavior, electro-optical (EO) coefficient and temporal stability of the epoxy/MMT nanocomposites are improved by the Diels-Alders crosslinking.

The invention discloses a longitudinal pockels cell employing ionic liquid as an electrode, and belongs to the field of high-power laser devices. The ionic liquid is adopted as the electrode of the longitudinal pockels cell; protective light windows are arranged on light-pass surfaces on two sides of electro-optical crystal of the longitudinal pockels cell, and are sealed with an outer light window to form an ionic liquid cavity; the ionic liquid in the ionic liquid cavity adopts a thin-layer state as the electrode, so that the longitudinal pockels effect is achieved. According to the longitudinal pockels cell employing the ionic liquid as the electrode, a high-voltage gas is not needed to discharge electricity to form a plasma electrode; the drive voltage of the longitudinal pockels cell is lower than that of the plasma electrode pockels cell; the system is simple in structure, large in caliber and low in cost; the ionic liquid electrode is free of damaging threshold limitation; the longitudinal pockels cell can be applied to Q modulation and inter-stage isolation of the laser device.

An optical voltage measuring apparatus includes at least a light source, an optical branching device, a polarizer, a phase modulator, a transmission fiber, a Faraday rotator that turns the polarized wave of emitted light from the fiber, an electro-optic element that applies refraction index change by a Pockels effect to the turned light, a reflector mirror, and a detector. When the temperature coefficient of the sensitivity of the electro-optic element is positive, incident polarized light orientation of the Faraday rotator to the electro-optic element is set so as to be coaxial with the axis of birefringence that appears by the Pockels effect at the lowest temperature in a service temperature range. When the temperature coefficient of the sensitivity of the electro-optic element is negative, the same setting is made at the highest temperature in the service temperature range.

Disclosed is a fast spatial optical switch using two uniaxial optical crystals with triangular 3m symmetry and their optical axes perpendicular to each other based on the use of the Pockels effect to change the refractive index and optical axis of one of the crystals. Wherein the top surface and the bottom surface of the first crystal inducing the Pockels effect are provided with electrodes. The interfaces between the crystals form a certain angle, so that the light beam is totally reflected by the first crystal. When an electric field is applied through the first crystal, the refractive index and the crystal axis of the first crystal change, so that the interface becomes transmissive, and a light beam is emitted from the second crystal. The spatial separation of the transmissive and reflective states provides crosstalk and extinction ratios greater than 50 dB.