516 results about "Half wave" patented technology

The invention discloses a method and a system for measuring an error caused by wavelength drift of an optical fiber current transformer. The method comprises the following steps: constructing a first mathematical model of a half-wave voltage size and a wavelength size, and a second mathematical model of a Verdet constant and the wavelength size; according to the first mathematical model and the second mathematical model, constructing a third mathematical model of the Verdet constant and the half-wave voltage; and constructing a fourth mathematical model of the output optical signal and the half-wave voltage, and determining the total influence of the wavelength drift on the output optical signal according to the fourth mathematical model. The error of wavelength drift can be effectively compensated, and the measurement performance of the optical fiber current transformer is improved.

Provided is an impedance measurement device 100 for measuring the impedance of a battery cell. The device acquires a cell voltage signal between the positive and negative electrodes of a battery cell 20 while a measurement current wave is made to flow through the battery cell 20, modulates the cell voltage signal with a polarity inversion wave synchronized with the half wave of the measurement current wave, adds the modulated wave at the non-inverted and inverted half-cycles of the modulated wave, and adds the modulated wave a prescribed number of times at a cycle synchronized with the polarity inversion wave, thereby generating an AC voltage detection signal, and measures the impedance of the battery cell 20 from the amplitude ratio and the phase difference between the AC voltage detection signal and the measurement current wave.

The invention discloses a sensor data acquisition edge calculation method and system, and the method comprises the following steps: respectively sampling a high-frequency signal and a low-frequency signal of a sensor, respectively inputting the high-frequency signal and the low-frequency signal into different filters for filtering, and then inputting the filtered signals into an edge calculation system through different AD converters; a high-frequency signal and a low-frequency signal in the edge computing system are processed by different computing methods to obtain a measured value, and the measured value is processed to obtain a first half-wave moment of a fault signal or a partial discharge signal. According to the sensor data acquisition edge calculation method provided by the invention, the high-frequency part and the low-frequency part of the sensor are respectively acquired and processed, the low-frequency sampling frequency is 6.4 kHz, 128-point sampling of 50Hz is realized, the pressure of subsequent data processing is reduced, and errors are reduced; the high-frequency sampling frequency is 10MHz, and a high-frequency transient process is processed by using a time-frequency analysis method. The data processing efficiency and real-time performance are improved, the network burden is reduced, and the cost is reduced.

The present invention discloses a method and a system for enhancing an ultrasonic guided wave signal based on multi-modal recognition and fusion. The method includes: solving an ultrasonic guided wave frequency dispersion curve of a detected structure, selecting target detection modes, and setting the strongest energy mode as the main mode; forming a frequency dispersion dictionary and obtaining sub-signals, then converting their abscissa axes from time to signal source distances; grouping sub-signals with similar source distances, classifying them as single modal or main mode conversion sub-signals, and removing interference signals; and resampling the classified sub-signals at a uniform frequency, extracting half-wave envelope signals, and superposing them within each source group to obtain an enhanced target signal

The invention discloses a continuous scanning half-wave sampling system for a multi-dimensional coherent spectrum, which comprises a continuous laser, continuous laser output by the continuous laser and femtosecond laser pulse output by an ultra-short femtosecond laser pulse generation device are combined and then split, and modulation and time delay are respectively carried out; the multi-dimensional coherent femtosecond laser pulse sequence is used for exciting a fluorescence signal generated by a sample and converting the fluorescence signal into a first electric signal, and the obtained continuous laser carrying different modulation frequencies is converted into a second electric signal; and demodulating the second electric signal by taking a total mixing signal obtained by mixing the multiple paths of modulation signals as a reference, and demodulating the first electric signal by using the second electric signal. The invention further discloses a continuous scanning half-wave sampling method for the multi-dimensional coherent spectrum. The half-wave sampling method is utilized to accurately calibrate optical time delay so as to obtain the multi-phase multi-dimensional coherent spectrum. The sampling step length breaks through the limitation of the minimum sampling step length of traditional stepping collection, and the sampling bandwidth is remarkably improved.

The invention belongs to the field of intelligent operation inspection of power transmission lines, and particularly relates to a power transmission line galloping monitoring point determination method, a galloping monitoring quantitative analysis method, a galloping monitoring control method and devices. The method for determining the galloping monitoring point of the power transmission conductor comprises the following steps: acquiring and fusing image data and point cloud data of the power transmission conductor; selecting N monitoring points on the power transmission conductor for judging the galloping and half-wave number of the power transmission conductor; and in the fusion data, the position of each monitoring point in the image data is determined based on the position of each monitoring point in the point cloud data, the sag and pixel difference value of each monitoring point in the image data and the point cloud data are calculated respectively, and the physical size represented by each pixel of each monitoring point is calculated according to the sag difference value and the pixel difference value. According to the method, the problems of accurate identification of galloping, accurate tracking of the maximum amplitude point, large conversion error between the number of amplitude pixels and the physical amplitude and the like in video-based conductor galloping monitoring are solved, quantitative analysis of galloping is realized, and the power transmission stability and the intelligent operation inspection level are improved.

The invention discloses a high-voltage direct-hanging energy storage system and a control method, and relates to the technical field of power systems. The high-voltage direct-hanging energy storage system comprises at least one single-phase energy storage circuit, in the single-phase energy storage circuit, a direct-current energy storage module is formed by connecting N energy storage sub-modules in series, each energy storage sub-module comprises a half-bridge unit and an energy storage element, and the energy storage sub-modules are used for achieving switching of working states of input, switching-out or locking through the half-bridge units; the current conversion module comprises a first bridge arm branch and a second bridge arm branch; the first bridge arm branch and the second bridge arm branch are used for being connected to the two ends of a direct-current energy storage module in parallel, and the midpoint of the first bridge arm branch and the midpoint of the second bridge arm branch are used for being electrically connected with an alternating-current interface of one phase of an alternating-current power grid. The direct current energy storage module is used for generating a multi-level voltage equivalent to a half sine wave, and the current conversion module is used for performing forward output or reverse output on the multi-level voltage. According to the embodiment of the invention, the overall performance of the energy storage system can be effectively improved.

The invention discloses a method and device for measuring a crystal electro-optical coefficient at low voltage, and relates to the technical field of photoelectric coefficient measurement, and the method comprises the steps: employing a wavelength tunable laser as an incident light source of a crystal electro-optical coefficient detection system; before an incident light source is input into a to-be-measured laser crystal, a wave plate is added to serve as a phase compensator to generate phase delay phi 1, and meanwhile the to-be-measured laser crystal generates phase delay phi 2 under the action of direct-current voltage; when the crystal electro-optical coefficient detection system is a half-wave voltage detection system; adjusting the wavelength of the tunable laser so that 3pi / 4 is less than or equal to phi1lt; pi; when the crystal electro-optical coefficient detection system is a full-wave voltage detection system, the wavelength of the tunable laser is adjusted to enable 7pi / 4 to be smaller than or equal to phi1lt; 2pi. As the used light source is the wavelength tunable laser, phi 1 can be adjusted in a large range by changing the wavelength, so that phi 2 and the test voltage are changed, the purpose of measuring the electro-optical coefficient of the crystal at low voltage is achieved, and the test safety is improved.

A sine half-wave generating device comprises a power supply circuit and a test circuit connected with the power supply circuit, a main loop of the test circuit is provided with a connection interface for connection of a test sample, and the test circuit comprises a current peak selection module, a control module, an output module and a waveform direction switching module. The current peak value selection module is used for changing the current peak value on the main loop, and the waveform direction switching module is used for changing the waveform generation direction on the main loop. The beneficial effects of the utility model are that the test circuit is divided into functional modules of current peak value selection, control, output, waveform direction switching and the like, a modularized residual current test system architecture is formed, and sine half-wave pulses which can be flexibly adjusted can be provided according to the performance test requirements of the residual current operated circuit breaker.

The invention relates to the technical field of optical modulators, in particular to a method for testing half-wave voltage and modulation efficiency of a Mach-Zehnder modulator, and the method comprises the steps: controlling the input optical power of a slave beam splitter to be a fixed value, and adjusting the output optical power of the Mach-Zehnder modulator to be half of the maximum value of the output optical power; voltage values # imgabs0 # and # imgabs1 # are applied to the upper modulation arm and the lower modulation arm respectively; linearly fitting the relation between the electro-optical phase shift # imgabs2 # and the voltage value # imgabs3 # generated by the upper modulation arm and the relation between the electro-optical phase shift # imgabs4 # and the voltage value # imgabs5 # generated by the lower modulation arm to obtain a fitting coefficient; calculating a half-wave voltage # imgabs6 # of an upper modulation arm and a half-wave voltage # imgabs7 # of a lower modulation arm based on the fitting coefficient; and calculating the half-wave voltage # imgabs8 # of the Mach-Zehnder modulator. According to the invention, the half-wave voltage and modulation efficiency of the Mach-Zehnder modulator can be conveniently tested.

The invention discloses a dynamic tunable zero-level electro-optical wave plate system, a device and a preparation method, and belongs to the technical field of optical devices. The invention provides a dynamic tunable zero-order electro-optical wave plate system, and the system comprises a zero-order electro-optical wave plate device which comprises a wave plate substrate made of an electro-optical crystal of a non-centrosymmetric structure, and an electrode disposed on the wave plate substrate; the output end of the adjustable voltage source is electrically connected with the electrode; wherein the adjustable voltage source is configured to be capable of outputting a half-wave working voltage corresponding to a target working wavelength, so that the zero-order electro-optical wave plate device works at the target working wavelength as a half-wave plate. According to the invention, self-adaptive matching of a single device to a plurality of working wavelengths is realized, the problem that the working wavelength of the device is single due to material dispersion is solved, and meanwhile, the processing difficulty of an ultrathin structure required by a specific wave band is avoided.

The utility model discloses a balun-integrated full-wave oscillator radiation unit, and aims to solve the problems that a low-frequency bowl-shaped oscillator and a high-frequency die-cast half-wave oscillator are used in the conventional high-low frequency nesting scheme, so that the requirements of miniaturization and light weight of an antenna are difficult to meet, the processing cost is extremely high, and the cost is low. And meanwhile, the high-frequency oscillator is arranged in the bowl-shaped oscillator, so that the horizontal plane wave width deformation of the high-frequency oscillator is caused, the gain is influenced, and the market demand cannot be met. The Balun-integrated full-wave oscillator radiation unit comprises a fixed support and a PCB radiation plate installed on the fixed support. The structure of the full-wave oscillator is relatively simple, assembly can be completed only by installing the single-balun integrated feed sheet in the fixing support and welding and fixing the single-balun integrated feed sheet and the PCB radiation plate, miniaturization design can be achieved through the microstrip technology, the printed circuit technology and the like due to the fact that single-face embedded coupling is adopted, the requirement of miniaturization equipment is met, machining is easy, and cost is low. The production efficiency can be greatly improved, and the production cost is reduced.

The invention relates to the technical field of electric power safety monitoring, in particular to a fault arc detection method, device and equipment and a storage medium, and the method comprises the steps: obtaining a current periodic waveform of an electric power system in a low-voltage alternating current scene, and collecting a first half-wave waveform of the current periodic waveform according to a time sequence, determining the next half-wave waveform which is continuous with the first half-wave waveform as a second half-wave waveform; acquiring a first current characteristic parameter of the power system in the first half-wave waveform, and acquiring a second current characteristic parameter of the power system in the second half-wave waveform; and determining an adjacent half-wave similar threshold according to the first current characteristic parameter and the second current characteristic parameter, and identifying the fault arc according to the adjacent half-wave similar threshold. The invention aims to improve the accuracy of identifying the fault arc.

The utility model provides a half-wave sine protection circuit of a three-wire three-pin circuit of a double-core heating wire of a double-partition PTC heater, and the half-wave sine protection circuit can also be a four-partition circuit X2. Comprising a controller and a blanket body, the blanket body comprises a first partition and a second partition, and the first partition comprises a heating wire, a temperature sensing wire, a 1-A-PTC heating wire end, a 1-A-temperature sensing wire end, a 1-B-PTC heating wire end and a 1-B-temperature sensing wire end; the second partition comprises a heating wire, a temperature sensing wire, a 2-A-PTC heating wire end, a 2-A-temperature sensing wire end, a 2-B-PTC heating wire end and a 2-B-temperature sensing wire end; the temperature sensing wires of the first zone and the second zone are connected in series with the heating wires; the controller comprises an AC power supply input module, a fuse F1, an EMI module, a 5V voltage stabilizing circuit, a main control circuit, a first PTC sampling temperature control module, a first heating drive, a second PTC sampling temperature control module, a second heating drive, a heating wire NTC temperature sensing wire short circuit and open circuit detection and protection module, a zero cross detection module, a display module, a key module, a contact pin H1, a contact pin H2 and a contact pin H3. And a first half-wave sine protection driving circuit module and a second half-wave sine protection driving circuit module.

Disclosed in the present invention are a method for precise transmission and parsing of a phase-cut transmission control signal, a control system, an apparatus and a gateway device. On the basis of a live wire alternating current sinusoidal signal, generation of a zero-crossing pulse signal is triggered every T / 2 cycle; a synchronization signal immediately follows the generation triggering of a current zero-crossing pulse; during a valid identification cycle Ta, a falling edge of an alternating current half wave is caused to generate a right notch corresponding to a time tR, or an original state is maintained until a next zero-crossing pulse is generated; the generation of a zero-crossing pulse represents a first digital signal, and the generation of a right notch represents a second digital signal, signals outside the cycle Ta being invalid. A midpoint between a rising edge and a falling edge of each zero-crossing pulse is used as a theoretical zero-crossing point to trigger timing, and the position of the theoretical zero-crossing point is corrected in real time for each zero-crossing pulse signal, thereby eliminating communication errors caused by alternating current interference; a synchronization signal and a valid identification cycle are used to mark the start and the end, thereby achieving precise parsing; and when there is no data transmission, only zero-crossing pulses are generated, thereby reducing energy consumption.

The present invention relates to the fields of ferroelectric single crystal technology and acousto-optical device technology, particularly to a silicon-based lead magnesium niobate (PbMn) single crystal piezoelectric wafer structure, preparation method, and application. The structure comprises a silicon substrate on which a silicon dioxide layer and a single crystal piezoelectric thin film layer are sequentially disposed; the single crystal piezoelectric thin film layer is a PbMn-PT single crystal, including a binary PMN-PT single crystal thin film or a ternary PIN-PMN-PT single crystal thin film. This piezoelectric wafer structure on a silicon substrate can be used to fabricate various high-performance piezoelectric MEMS sensors, actuators, and electro-optical modulator devices. The resulting surface acoustic wave (SAW) filters and thin film bulk acoustic wave (BAW) filters exhibit a relative bandwidth increase of over 50%, and the resulting electro-optical modulators exhibit lower half-wave voltage and higher electro-optical modulation efficiency. The device volume can be reduced by 10 times, better meeting the future 6G communication requirements for higher efficiency, higher integration, and miniaturization of MEMS devices. This provides a novel multilayer piezoelectric wafer structure for the miniaturization and integration of piezoelectric MEMS and optoelectronic devices.

A laser phase modulation frequency shift device based on a multi-harmonic microwave synthesizer comprises an upper computer. An upper computer signal is respectively connected with the first microwave generator, the second microwave generator, the third microwave generator, the fourth microwave generator, the first digital phase shifter, the second digital phase shifter, the third digital phase shifter and the fourth digital phase shifter through the microcontroller; the microwave generator generates a microwave signal according to a reference signal source, the microwave signal is subjected to phase shifting through the digital phase shifter and then synthesized into a sawtooth wave signal in the frequency mixer, the sawtooth wave signal is amplified through the power amplifier until the peak value reaches half-wave voltage and then input into the optical fiber electro-optic phase modulator, and frequency shifting is conducted on laser; the spectrum analyzer is connected with the output end of the power amplifier, analyzes the sawtooth wave signals, generates harmonic signals of all orders, and optimizes the frequency shift of the laser; the design has a higher optical signal bandwidth, is more suitable for an optical fiber electro-optic phase modulator, and achieves the maximization of the efficiency of frequency shift laser.

The utility model provides an anti-unmanned aerial vehicle antenna structure, which comprises an antenna housing, a reflecting plate, a plurality of radio frequency cable joints arranged in the antenna housing, a feed network, an antenna half-wave oscillator, a power divider, a coupler, a directional coupler, a directional antenna system, a control system and a power supply unit, wherein a plurality of radio frequency cable probes are connected with the antenna half-wave oscillator; comprising a 868MHz / 915MHz radio frequency cable joint, a 1.5 GHz radio frequency cable joint, a + 2.4 GHz radio frequency cable joint, a-2.4 Ghz radio frequency cable joint, a 5.8 GHz radio frequency cable joint and a 533MHz-6000 MHz radio frequency cable joint. The antenna half-wave oscillator comprises a T-shaped antenna, a symmetrical antenna, a ceramic antenna and an aluminum plate antenna; the power divider is connected with the symmetrical antenna; the coupler is connected with the T-shaped antenna; the directional coupler is connected with the ceramic antenna; the directional antenna system is connected with the control system. The antenna provided by the utility model is smaller in structure, improves the interference precision, reduces the energy consumption, enhances the anti-interference capability, and is higher in antenna gain.

The invention discloses an electro-optical modulator and a preparation method thereof. The electro-optical modulator comprises a substrate layer; the resin layer is arranged on one side of the substrate layer; the film lithium niobate layer is arranged on the side, away from the substrate layer, of the resin layer, and ridge waveguides are arranged on the surface of the part, close to the resin layer, of the film lithium niobate layer; and the metal electrode layer is arranged on the partial surface, far away from the resin layer, of the thin film lithium niobate layer. The thin-film lithium niobate electro-optical modulator with the metal electrode layer and the ridge waveguide in different planes is adopted, low half-wave voltage and low light absorption loss can be achieved, meanwhile, the speed and impedance matching of microwaves and light waves are achieved, and therefore microwave loss is reduced.

Embodiments herein describe using a birefringent element (e.g., a half-wave plate, full-wave plate, birefringent crystal, or metasurface) or a band-pass filter to reduce the laser line broadening induced by the soliton self-frequency shift. The birefringent element may a free space element that is part of the laser cavity. Due to dispersion, different frequencies (or colors) of light in the laser travel through the birefringent element at different speeds. This dispersion results in the birefringent element introducing slightly different polarization shifts for the different frequencies of light in the laser. When this light passes through a polarizer (which is set to filter out polarizations different from a desired polarization), the polarizer attenuates or extinguishes the frequencies that do not have the polarization of the design frequency of the birefringent element.

The invention discloses a liquid crystal variable retarder calibration method based on an interference method. The method is used for accurate calibration of LCVR electric control retardation. According to the method, an interference image is collected through a CCD camera, and after the image is preprocessed, FFT transformation unwrapping is carried out on an image column average intensity vector to obtain an LCVR electric control phase retardation curve. A polarization camera collects a light intensity image containing multi-polarization information at a time, polarization sub-images corresponding to 0 degree, 90 degrees, 45 degrees and 135 degrees are decomposed through sub-pixel sampling, a polarization judgment curve is formed through difference calculation of Stokes parameters S0 and S2, and the LCVR half-wave delay voltage is determined through the position of the minimum value of the curve. According to the method, the vibration resistance of the interference method and the noise reduction characteristic of the Stokes vector method are combined, the LCVR electric control delay curve can be calculated through the interference method, meanwhile, the half-wave delay voltage is synchronously indicated through Stokes vector calculation, the problems of unstable laser light source intensity, environmental disturbance, noise influence and the like are effectively solved, and the method has important significance on accurate calibration of the LCVR.

The invention discloses an omni-directional optical half-wave oscillator design method and system, and the method comprises the steps: arranging a plurality of light-emitting units in a rotationally symmetrical geometric layout based on the symmetry and continuity requirements of light spots, and determining the minimum number of units through restraining the maximum azimuth angle interval between adjacent units not to exceed a preset threshold value, thereby enabling the superposed light spots to approach a circle; a light spot uniformity quantitative evaluation mechanism is introduced, a dynamic evaluation index is generated by calculating the ratio of the light spot area to the perimeter, and the unit number and the arrangement mode are optimized in real time; light spot distribution curves under different arrangements are simulated in combination with the divergence characteristics of the light emitting units, parameters are adjusted through iteration until evaluation indexes reach a preset range, and the optimal radiation array configuration is determined. The problem of strict alignment in traditional optical communication is solved, multi-terminal parallel receiving is supported, and the system has remarkable advantages in the aspects of providing uniform illumination, improving mobile communication stability, ensuring electromagnetic compatibility, achieving energy feeding and the like.

The invention discloses a photovoltaic power generation system, and belongs to the technical field of power generation. The system comprises an inverter circuit, an alternating-current starting circuit and a control unit, the alternating-current starting circuit comprises an alternating-current starting switch, an isolation module and a charging module which are sequentially connected from a power grid side, and the control unit is connected with the inverter circuit and the alternating-current starting switch. The control unit is used for controlling the alternating-current starting switch to be closed and transmitting electric energy of a power grid through the isolation module when the direct-current voltage of the input end of the inverter circuit is lower than the sum of the power grid line voltage peak-to-peak value and a threshold value and an alternating-current starting instruction is received, and the charging module carries out current limiting and rectifying processing on alternating-current electric energy output by the isolation module. The direct-current bus capacitor is charged by alternating positive and negative half waves of alternating current; and the control unit is also used for controlling the alternating current starting switch to be switched off and starting the inverter circuit under the condition that the direct current bus capacitor is charged to the target voltage required by grid connection. The system can be safely and reliably started when no sunlight exists at night.

The invention discloses a frequency response testing device and method for a Mach-Zehnder electro-optical modulator, and belongs to the technical field of photoelectrons. A dual-tone or multi-tone optical signal output by the optical excitation module is transmitted to the Mach-Zehnder electro-optical modulator to be measured; the signal source outputs a sinusoidal signal of which the frequency is f, and the sinusoidal signal is loaded to a radio frequency driving electrode of the Mach-Zehnder electro-optical modulator to be measured to modulate an optical signal sent into the Mach-Zehnder electro-optical modulator to be measured by the optical excitation module; and finally, a modulated light signal output by the Mach-Zehnder electro-optical modulator to be measured is subjected to photoelectric conversion and detection through the measurement module. And extracting a modulation coefficient and a half-wave voltage of the Mach-Zehnder electro-optical modulator to be measured at the frequency f according to the amplitude of the detection signal and the signal amplitude loaded to the Mach-Zehnder electro-optical modulator to be measured by the signal source.

A device for generating linearly polarized light having different azimuth angles, and a laser beam machining method. The device comprises: a laser, a half wave plate, an electro-optical modulator, a reflection system and a quarter wave plate, wherein the quarter wave plate is used for adjusting light to linearly polarized light of which the polarization direction has an included angle of 45 degrees relative to a horizontal plane; the electro-optical modulator is used for adjusting the linearly polarized light output by the half wave plate, such that a polarization state of emergent light of the electro-optical modulator always lies on a meridian of a Poincaré sphere, thereby outputting Poincaré meridian polarized light; the reflection system is used for reflecting the Poincaré meridian polarized light to the quarter wave plate; and the quarter wave plate is used for adjusting the reflected light, such that the polarization state of emergent light of the quarter wave plate always lies on the equator of the Poincaré sphere, thereby outputting the linearly polarized light having different azimuth angles. The problem that the laser beam machining effects are affected by change in polarization state caused by reflectors in existing linearly polarized light generating devices is solved.

The invention provides a signal monitoring method and device applied to an electro-optical modulator, electronic equipment, a computer readable storage medium and a computer program product. The signal monitoring method comprises the steps that a modulation voltage signal is input into a modulation module of the electro-optical modulator, the modulation voltage signal is obtained by superposing a carrier voltage signal and a pulse voltage signal, the amplitude of the carrier voltage signal is larger than the half-wave voltage Vpi of the electro-optical modulator, and the amplitude of the pulse voltage signal is smaller than the peak-to-peak value Vpp of the carrier voltage signal; acquiring a photoelectric conversion detection signal corresponding to the output optical signal of the electro-optical modulator; and monitoring whether a pulse voltage signal exists in the modulation voltage signal based on the photoelectric conversion detection signal.

The invention provides a method for measuring additional phase delay introduced by optical voltage transformer light source wavelength fluctuation. The method comprises the following steps: S1, constructing an optical voltage transformer for realizing linear demodulation of phase delay based on an annular radial polarization grating; the optical voltage transformer comprises a light source, a polarizer, an electro-optical crystal, a quarter-wave plate, an annular radial polarization grating and a four-quadrant detector. An electric field where the electro-optical crystal is located is generated by alternating current voltage to be measured; and S2, modulating a to-be-measured AC voltage into two times of the half-wave voltage of the electro-optical crystal, and obtaining the additional phase delay introduced by the fluctuation of the central wavelength of the light source according to the light spot rotation angle measured by the optical voltage transformer. Direct linear measurement of phase delay is realized based on the annular radial polarization grating, and then additional phase delay introduced by light source center fluctuation is completely extracted and compensated, so that the problem of light source wavelength fluctuation is solved.

The present disclosure discloses a controllable line-commutated converter forced commutation test circuit and method, a computer device, and a storage medium. The controllable line-commutated converter forced commutation test circuit comprises: a steady-state power supply and a multi-wave harmonic current source. The steady-state power supply and the controllable line-commutated converter are connected in parallel, and the steady-state power supply is used to provide a voltage and a current that meet an actual stable operating condition of the controllable line-commutated converter. The multi-wave harmonic current source and the controllable line-commutated converter are connected in parallel, and the multi-wave harmonic current source is configured to periodically inject a fault current into the controllable line-commutated converter when a primary branch and an auxiliary branch in the controllable line-commutated converter are continuously alternately turned on and off over a plurality of cycles, so as to perform periodic forced commutation testing on the controllable line-commutated converter. In the present disclosure, the test circuit for synthesizing multi-source injection is used, and by means of using the multi-wave harmonic current source, an adjustable half-wave multi-wave sub-current is injected and is superposed on a test current of the steady-state power supply, to form a test current capable of verifying a controllable turning-off function of the converter.

The present invention discloses a dimming system based on a power line carrier and a dimming and color adjusting control method. The dimming system includes a phase-cut carrier controller, a main power supply, a dimming detection circuit, a color temperature adjusting detection circuit, a signal processing circuit, a first driving circuit, a second driving circuit, an MOS transistor Q1 and an MOS transistor Q2. Through the above structure, a waveform of waves in each cycle, input to a phase-cut dimming and color adjusting driver by a power frequency AC, is reserved, and there is no situation where the entire half wave is chopped. Therefore, each half wave input by the power frequency AC charges energy storage capacitors inside circuits, making the energy storage capacitor of the main power supply smaller and keeping required maintenance time for output of a lamp.

The invention relates to an electro-optical crystal half-wave voltage temperature correlation detection method and system. The system comprises a light source, a polarizer, an optical phase modulator, an isolation optical fiber, an electro-optical crystal to be detected and a polarization analyzer which are sequentially arranged along a light path. The included angle between the light transmitting direction of the polarizer and the fast axis direction of the optical phase modulator is 45 degrees; the included angle between the light transmitting direction of the polarization analyzer and the fast axis direction of the electro-optical crystal to be detected is 45 degrees; applying voltage to the optical phase modulator, wherein the voltage amplitude is 1 / 4 wavelength voltage of the optical phase modulator; constructing a light path inherent function; the environment temperature of the electro-optical crystal to be detected is changed, the intensity of output light at different temperatures is detected, the nearly 1 waveform variation is calculated according to the light intensity, and the correlation between the electro-optical coefficient of the electro-optical crystal to be detected and the temperature is judged according to the nearly 1 waveform variation.