344 results about "Triangular wave" patented technology

A motor controller for pulse heating of a power battery. The motor controller includes an inverter circuit, the inverter circuit includes three switching transistor bridge arms, two ends of each switching transistor bridge arm are respectively configured to connect to positive and negative electrodes of the power battery through a direct current bus, and bridge arm midpoints of the three switching transistor bridge arms are separately configured to connect to a three-phase winding of a motor. The bridge arm midpoints of the three switching transistor bridge arms are configured to output a three-phase current, the three-phase current is used to generate a pulse alternating current on the direct current bus, and the pulse alternating current is used to heat the power battery. A current of each phase of the three-phase current is a unipolar triangular wave, and a sum of the three-phase current is zero.

The invention provides a circulation power optimization method and system for a three-phase dual-active bridge, and relates to the field of power electronics, the method comprises the following steps: determining an optimal backflow modulation strategy set corresponding to a hybrid modulation group, the hybrid modulation group comprising triangular wave modulation, trapezoidal modulation, synchronous modulation and extended phase shift modulation, the optimal backflow modulation strategy set corresponding to the hybrid modulation group comprises modulation modes and degree-of-freedom relationships corresponding to different transmission power per unit value ranges in different voltage conversion ratio ranges; determining a degree of freedom and power relationship set corresponding to the hybrid modulation group, wherein the relationship set comprises a relationship between the degree of freedom and power of different transmission power per unit values corresponding to each mode; the phase shift angle, the primary side duty ratio and the secondary side duty ratio are determined by combining the real-time voltage conversion ratio and the real-time virtual power per unit value, operation of the three-phase dual-active bridge is controlled, and the method has the advantages of reducing complexity and improving portability and efficiency.

The invention discloses a millimeter wave detector suitable for a short-distance moving target. The millimeter wave detector comprises a millimeter wave front end and an intermediate frequency signal processing unit, wherein the intermediate frequency signal processing unit comprises a low-pass filtering and amplifying circuit which is used for realizing low-pass filtering of a first preset frequency; comprising a detection circuit which is used for outputting an envelope signal of a second preset frequency and filtering a triangular wave signal of a third preset frequency; the band-pass filtering and amplifying circuit is used for realizing band-pass filtering between a fourth preset frequency and a fifth preset frequency; and the signal peak threshold judgment circuit is used for judging whether a detection target appears in a distance range needing to be detected or not according to the signal output by the band-pass filtering and amplifying circuit. The millimeter wave detector suitable for the short-distance moving target has the beneficial effect that the short-distance target detection sensitivity can be effectively improved.

The invention provides a friction force identification method for a trailing edge flap driving mechanism with a bearing, and the method comprises the steps: applying a series of improved triangular waves with different speeds to a driver, carrying out the closed-loop control, carrying out the zero-phase digital filtering of a collected flap angle signal, and suppressing the interference of random noise to the signal, adjusting a buffeting phenomenon of a derivation step length inhibition speed to obtain a flap angular speed, then intercepting a constant-speed ascending section and a constant-speed descending section, then assigning a series of angular speeds, carrying out friction model identification on a relation between friction force and the speed, and then identifying a relation between parameters obtained by identification and a flap angle; finally, the friction force about the flap angle and the flap angular velocity in the flap driving mechanism is obtained.

The invention relates to a magnetotelluric noise suppression method based on ResAtt-CAE, and the method comprises the steps: generating a noise-free signal, adding a noise type into the noise-free signal to construct a noisy signal, and enabling the noisy signal to be matched with the corresponding noise-free signal to form a training set and a test set; designing a ResAtt-CAE model architecture, and realizing cross-level feature fusion by adopting a symmetric structure and jump connection; the ResAtt-CAE model architecture is trained and optimized through the training set and the test set, and the magnetotelluric noise is suppressed through the optimized ResAtt-CAE model architecture. The method is high in noise suppression capability: ResAtt-CAE captures cross-time scale signal features through multi-scale residual learning, enhances effective signal weights in combination with a time domain attention mechanism, and has a remarkable suppression effect on common magnetotelluric noise (square waves, harmonic waves, pulses, triangular waves and the like).

A light-emitting diode (LED) control unit includes: a pulse generator configured to generate a pulse signal; a T-filter configured to convert the pulse signal into a triangular wave signal; a first gate driver configured to receive the triangular wave signal and output a first gate control signal; a second gate driver configured to receive the first gate control signal and output a second gate control signal; a first switch configured to turn on a first LED string corresponding to a first color temperature based on the first gate control signal; a second switch configured to turn on a second LED string corresponding to a second color temperature based on the second gate control signal; and a power supply circuit configured to supply a power supply voltage to the pulse generator, the first gate driver, and the second gate driver by stepping down an operating voltage of the LED driver.

The invention discloses a voltage-to-current circuit, a calibration method, a multi-range calibration method and a power supply, a power amplification unit adopts MOS tubes of different channel types to match with working voltages of opposite polarities, and a bias circuit is combined to superpose exclusive bias, so that the waveform adaptation limitation of a traditional circuit is broken through, and the voltage-to-current conversion efficiency is improved. Alternating current, direct current, triangular waves, square waves and other special waveforms can be stably output, and the adaptability is greatly improved; secondly, pure hardware signal transmission and feedback are carried out in the whole process, the intermediate link of MCU measurement-setting is omitted, multi-stage error accumulation is effectively reduced, output delay is remarkably reduced, and the response speed is higher; in addition, the current sampling feedback unit and the error amplification unit form closed-loop control, power amplification output current is sampled in real time and fed back for calibration, and the precision and stability of the output current are effectively improved. Meanwhile, the bias circuit accurately regulates and controls the conduction state of the MOS tube, the linearity and consistency of current output are improved, and the overall structure is simple and reliable.

The invention discloses an electric linear servo system control method based on cascade LESO-DISMC. The method comprises the following steps: firstly, establishing a complete mechanism model of a permanent magnet synchronous motor servo loading system; then designing DOB interference observer real-time compensation by adopting a LuGre friction model and a gap dead zone model; a feedforward control quantity is constructed by utilizing a measurable displacement signal, and redundant torque is inhibited; designing a dynamic integral sliding mode controller to ensure global stability; a high-low bandwidth LESO is constructed, and both fast tracking and smooth filtering are considered; and finally, trajectory optimization is carried out, a smooth trajectory is generated by adopting polynomial interpolation for the step and triangular wave signals, and mechanical vibration is inhibited. According to the method, a LuGre friction model is adopted to compensate nonlinear friction, cascade linear LESO and sliding mode control are combined, a track is optimized through an S-shaped curve, and the problem of'differential explosion 'is solved; according to the method, instruction smoothing, core control and friction compensation are fused, and the anti-interference capability and the loading precision of the system are improved.

The invention relates to the technical field of converter control, in particular to a novel four-level efficient grid-connected system and a control method, and the method comprises the steps: determining the target output power, the target input power, the actual output power and the actual input power of a converter based on a 4L-HCC converter; determining a phase angle and an output voltage amplitude based on a preset virtual synchronous machine control strategy, and converting to obtain a corresponding three-phase reference voltage; performing HCC internal capacitor voltage control on the converter, establishing a corresponding loss function, and determining a reference wave change range corresponding to each switching device on the converter based on actual setting; the corresponding reference wave signal with the minimum loss function derivative is calculated; and carrying out phase shift pulse width modulation on the converter, taking high-frequency triangular waves with different phases as carriers, comparing the calculated reference wave signals with the carriers, calculating the duty ratio of each switching device of the converter and a switch driving signal, and driving each switching device of the converter.

The invention relates to the technical field of power grid measurement, in particular to a miniaturized wireless self-powered alternating current electric field measurement method and system. Comprising the following steps: acquiring radio frequency energy in an electric field environment, and converting the radio frequency energy into direct current electric energy through a radio frequency energy acquisition system consisting of a microstrip antenna, a voltage doubling rectifying circuit and an energy management circuit; an alternating current electric field signal is collected through a differential dual-electrode sensor structure, and an electric field voltage signal is generated; amplifying the voltage signal through an instrument amplifier, and obtaining a digital signal of the electric field signal through an analog-to-digital conversion circuit; and processing and analyzing the alternating current electric field information according to the digital signal. By combining a radio frequency energy acquisition technology with a differential dual-electrode sensing structure, the electric field sensor has the performance characteristics of self energy supply, miniaturization, high precision, wide frequency response and low power consumption. The system can measure various types of electric field signals, including sine wave, triangular wave and square wave electric field signals, has a wide frequency range and a wide measuring range, and is excellent in linearity.

The invention discloses an automatic frequency stabilization system based on dual-core correlation matching intelligent peak searching. The automatic frequency stabilization system comprises the following steps that S1, a saturated absorption spectrum light path and a circuit are built, debugged and optimized; s2, constructing a double-matching template; s3, triangular wave voltage scanning and clock timing are started, and signals are collected and transmitted; s4, starting a KCF algorithm, applying a template to track model matching, judging a result obtained by matching, finding a peak point and solving a corresponding scanning voltage; and S5, recording a peak point scanning voltage, closing a scanning signal, starting sinusoidal signal modulation, and giving a triangular wave scanning voltage corresponding to a peak value to the sinusoidal signal as an offset. The spectrum line peak value suspected area can be effectively positioned, the double-branch and correlation filtering tracking method can perform precise secondary searching in the suspected area, the locking precision is greatly improved, the long-term stability of 10-12 orders of magnitude is ensured, and meanwhile the good vibration interference resistance can be achieved when a vibration signal occurs.

The invention discloses a laser radar and a signal modulation method and device of a silicon light phase shifter, and relates to the technical field of laser radars. The signal modulation method comprises the following steps: providing an initial driving voltage signal for a silicon light phase shifter, so that the silicon light phase shifter modulates a laser signal according to the initial driving voltage signal; obtaining the phase of the laser signal modulated by the silicon light phase shifter; modulating the initial driving voltage signal into a periodic modulation voltage signal according to the phase of the laser signal; acquiring a modulation slope corresponding to the modulation voltage signal of each period; performing waveform modulation on the modulation voltage signal according to the modulation slope corresponding to the modulation voltage signal of each period to determine a modulation driving voltage signal; providing the modulation driving voltage signal to a silicon light phase shifter, so that the silicon light phase shifter modulates the laser signal according to the modulation driving voltage signal, and determining a modulation laser signal; and the frequency of the modulated laser signal is linearly changed in a triangular wave form along with time. According to the invention, the measurement precision of the laser radar is improved.

The invention relates to the technical field of geotechnical engineering anchoring, in particular to a method for testing the degradation characteristic of the bearing performance of a recyclable anchor rod under cyclic loading. The method comprises the following steps: preparing a unit body sample anchor-rock interface unit body sample, simulating weathered soft rock according to a specific ratio, pouring a self-compacting concrete anchoring body, and curing and forming; setting a combined parameter of a reference load ratio and a load cycle index, applying a triangular wave cyclic load to simulate a traffic condition, and executing a pull-out test to collect load-displacement data; constructing a two-parameter coupled shear strength degradation model based on test data, and proposing a shear stress-displacement curve model; an anchor rod load transfer control equation is established in combination with the Poisson effect, and shear stress distribution of the anchoring section is iteratively solved by adopting a discrete recursion method; the model is verified through a foundation pit engineering case, the ultimate bearing capacity degradation law of the anchor rod under long-term cyclic loading is predicted, and it is proved that the model can guide engineering safety design. According to the method, the coupling characterization of the cyclic load parameter and the interface degradation mechanism is realized.

The invention discloses a compensation method for monitoring a linear motion target by a camera based on galvanometer control. The method comprises the steps of performing initial angle adjustment on a galvanometer to enable a target to be located at a preset position in a camera view, then setting camera exposure time and continuously shooting target moving images; the image processor selects the first two images of the target moving to the specific area to perform block matching so as to obtain the angular velocity of the galvanometer; when the target moves to a specific area, sine wave signals are generated according to the angular velocity of the galvanometer and input to a galvanometer motion controller, and then the galvanometer is controlled to rotate through a galvanometer motor; the target continues to move linearly, and when the target moves into the specific area, a target moving image shot by the camera serves as a compensation image. According to the invention, a dynamic response sine of the galvanometer is used for scanning a target, the motion blur phenomenon caused by exposure time in a high-speed tracking image is solved, a sine wave signal is used for replacing an existing triangular wave signal to drive a galvanometer motor, and the smoothness and stability of rotation of the galvanometer are improved.

The invention relates to a resonant optical gyroscope signal detection method based on an optical switch. The resonant optical gyroscope signal detection method comprises the following steps: step 1, adopting a narrow linewidth laser as a light source; 2, the split light field enters a lithium niobate phase modulator A and a phase modulator B to be modulated by a triangular wave voltage signal, the light field subjected to phase modulation is coupled in opposite directions to enter a waveguide resonant cavity, and a photoelectric detector A and a photoelectric detector B are used at the output end of the resonant cavity to obtain a voltage signal; and voltage signals obtained by the photoelectric detector A and the photoelectric detector B are accessed to a lock-in amplifier. 3, arranging an optical switch A between the waveguide resonant cavity and the photoelectric detector A; and an optical switch b is arranged between the waveguide resonant cavity and the photoelectric detector B, so that the detection of a gyro signal is completed. The interference of polarization noise can be reduced, and the resonant frequency locking precision and the angular velocity detection sensitivity of the gyroscope are improved.

The invention belongs to the technical field of power transmission, and relates to a multi-level D-type power amplifier, a PA chip and a broadband carrier communication system, which comprise a triangular wave signal module, a comparison module, a driving circuit and a loop filter, the triangular wave signal module generates N phase shift triangular waves with different phase shift angles; the comparison module compares the input signal with N phase shift triangular waves with different phase shift angles, and outputs N paths of PWM signals; the driving circuit amplifies the N paths of PWM signals and outputs PWM amplified signals containing N + 1 levels; and the loop filter filters the PWM amplification signal to obtain a filtered PWM amplification signal. According to the multi-level D-type power amplifier, high equivalent bandwidth can be realized with low switching frequency, and meanwhile, the output stage adopts multi-level synthesis, so that the switching loss is reduced.

A Class-D audio amplifier includes a triangular wave generator, a wave reshaping device and a pulse-width modulator. The triangular wave generator generates a first triangular wave. The wave reshaping device generates a second triangular wave by reshaping the first triangular wave. The pulse-width modulator modulates a pair of differential audio input waves with the second triangular wave instead of the first triangular wave to reduce a switching loss of the Class-D audio amplifier.

The invention discloses an FMCW laser measurement system light source nonlinear correction method based on physical mapping modeling and a TD3 algorithm, and belongs to the fields of laser radar, laser measurement, artificial intelligence and the like. An FMCW laser measurement system is usually limited by the nonlinear characteristic of a tunable laser, especially the bandwidth is increased under triangular wave modulation, a traditional correction method is difficult to achieve a good effect, and the measurement precision and quality are affected. The invention provides an innovative correction method combining a physical mapping model and a TD3 algorithm, and provides an effective compensation mechanism for nonlinear errors of an FMCW laser measurement system under triangular wave modulation. Comprising the following steps that an FMCW laser measurement system is designed and built, PD measurement data are utilized, data preprocessing is carried out, and a data set is built; fitting nonlinear characteristics of the system by using a physical mapping relation; nonlinear correction is realized based on TD3 algorithm control; the nonlinear correction method optimizes the performance of the FMCW laser measurement system through combined application of physical mapping modeling and an RL control strategy.

An electronic device may include an inverter. The inverter may receive switching signals based on a dithered clock signal and output corresponding alternating current signals to a wireless power transfer coil. The dithered clock signal may have a plurality of frequency steps during a repeated cycle of the dithered clock signal. The repeated cycle of the dithered clock signal may comprise a step function that approximates a triangular waveform with steps having unique frequency magnitudes during the repeated cycle.

The invention discloses a trapezoidal wave current soft switching method of an interleaving DC-DC converter, which is used for a two-phase interleaving bidirectional DC-DC converter based on a coupling inductor and a multi-phase interleaving converter thereof, and is characterized in that an inductive current adopts a trapezoidal wave mode, so that the converter works in an approximate critical conduction mode; a fixed switching frequency control or hybrid control method is adopted, so that the device can work in a Buck mode and can also work in a Boost mode. The method for realizing the soft switching is characterized in that the parasitic capacitance or the external resonant capacitor of the switching tube is discharged to be zero under the resonance action of the inductor and the capacitor in the dead zone time when the upper bridge arm switch and the lower bridge arm switch are alternately switched on, so that the zero-voltage switching-on of all the switching tubes is realized. And each phase current sharing control is adopted in the multi-phase interleaving parallel topological structure. According to the invention, the problems of large current peak value and high turn-off loss of a traditional triangular wave current mode are solved, the output ripple current is reduced, a soft switching method is provided, the switching loss is reduced, and the conversion efficiency of the converter is improved.

The invention provides a digital isolator with both high-speed communication and high common-mode transient immunity. The digital isolator comprises a transmitter, a coupling inductor and a receiver, the transmitter comprises an oscillator, a modulation capacitor assembly and a common-mode transient immunity enhancement module; the oscillator is configured to receive a data signal and generate a first differential signal based on the data signal; the modulation capacitor assembly is configured to modulate a code element 0 into a first frequency and modulate a code element 1 into a second frequency; the common-mode transient immunity enhancement module is configured to determine a bias control signal according to the first differential signal; the receiver is configured to receive the second differential signal and obtain a square wave signal based on the second differential signal; obtaining a triangular wave signal based on the square wave signal; obtaining the maximum value of a triangular wave signal according to the falling edge signal of the square wave signal; and obtaining a target data signal based on the maximum value, so as to solve the problem of low communication and common-mode transient immunity performance of the existing digital isolator.

The invention provides a multi-phase pulse width modulation method and related equipment for reducing harmonic waves for a class-D power amplifier, and relates to the field of radio and television, and the method comprises the steps: sampling an original audio signal at a preset sampling rate, and obtaining a sine wave audio signal; generating a plurality of triangular wave signals corresponding to the sine wave audio signal according to a preset frequency multiple; performing amplitude comparison on the sampling signal and each triangular wave signal to obtain a pulse width modulation signal corresponding to each triangular wave signal; superposing the plurality of pulse width modulation signals to obtain a superposed signal; and inputting the superposed signal into a D-type power amplifier to obtain a power amplifier output signal after harmonic wave reduction. By implementing the method, the performance requirement on a post-stage low-pass filter can be reduced, so that the harmonic distortion of the output signal is suppressed on the premise of not increasing the cost and complexity of the filter.

A method and system delivers customizable microcurrent stimulation to ocular tissue using a three half-bridge driver circuit. The system includes a control circuit that selectively switches high-side and low-side transistors, such as MOSFETs, to generate various electrical waveforms, such as stepped, asymmetric biphasic, pulsed, and triangular waveforms. These waveforms are applied to electrodes in contact with the eye for therapeutic treatment, addressing conditions like age-related macular degeneration (AMD) and other ocular disorders. The system allows for adjustments in amplitude, frequency, and duration of the waveforms, providing personalized treatment protocols tailored to patient-specific needs. High-impedance periods are included between pulses to promote tissue recovery and enhance patient comfort. Additionally, a non-transitory computer-readable storage medium stores a program that controls the system, enabling real-time waveform generation and dynamic adjustment during treatment. This approach offers a flexible and efficient solution for ocular therapy, improving both treatment outcomes and patient experience.

A power conversion device (1A) for supplying power to a multi-phase load on the basis of a first command value, which is a sinusoidal phase voltage command value, is provided with: a multi-phase inverter circuit (3) in which branches are connected in parallel between positive and negative terminals of a DC power source, said branches being formed by connecting two semiconductor switching elements having a reverse conduction function in series, the number of branches being the same as the number of phases; a terminal between the two semiconductor switching elements of each branch is connected to each phase of a load; a modulation voltage generator (6A) that generates a second command value including a fundamental component including the first command value and a higher harmonic component including at least one sine wave having an odd number of frequencies with respect to the fundamental component; a carrier signal generator (7A) that generates a carrier signal of a triangular wave such that the frequency is odd multiples of the fundamental component of the first command value and the median of the triangular wave is zero-synchronized with the phase of the fundamental component of the first command value; and a strobe signal generator (8) that generates a strobe signal for driving the semiconductor switching element on the basis of the result of comparison between the second command value and the carrier signal.

A control method for suppressing high-frequency howling of a permanent magnet synchronous motor relates to the field of motor control and noise suppression, and includes the following steps: Step 1: Considering the influence of rotor position on pulse width modulation, design a segmented hybrid switching frequency modulation strategy: Step 2: Simulate and determine the frequency, spread spectrum width and proportional coefficient of the triangular wave periodic function in the segmented hybrid switching frequency modulation strategy, Step 3: According to Step 1 and Step 2, obtain the change value of the switching frequency with the rotor position, and output six-way drive signals after space vector pulse width modulation, which are used to control the on and off of the switch tube of the permanent magnet synchronous motor driver inverter, so as to achieve the purpose of suppressing the high-frequency howling of the permanent magnet synchronous motor. The present invention suppresses high-frequency sideband harmonics, thereby suppressing the high-frequency howling of the permanent magnet synchronous motor. The method is low-cost, easy to implement, and does not need to add additional hardware equipment; a segmented hybrid switching frequency spread spectrum modulation strategy is set to better disperse and suppress high-frequency current harmonics and high-frequency howling noise.

The application discloses a self-adaptive aviation power grid input filter capacitor simplification compensation method, which simplifies input filter capacitor current to be compensated, and uses a simplified triangular wave to approximate a cosine for compensation, so that the calculation amount is greatly simplified; and the method adaptively simplifies a triangular wave approximation compensation function with the change of an input frequency and an input voltage effective value, so that the calculation amount can be further simplified. The method fully considers the problem of small storage or weak calculation capacity of the current domestic digital controller, and has strong use value for the current aviation power source domestic substitution.

The invention discloses a self-adaptive impedance matching system and method based on a dual-tone signal source. The self-adaptive impedance matching system comprises a front-end rectifying circuit, a direct-current filter, a direct-current booster circuit, a feedback control network and a load. The self-adaptive impedance matching system inputs a dual-tone signal into a front-end rectifying circuit, and outputs a baseband signal containing a direct current component and a difference frequency component. The direct-current component serves as an input signal of the direct-current booster circuit, the difference frequency component is extracted through a coupling inductor in the feedback control network and processed into a triangular wave, the triangular wave and the input signal of the direct-current booster circuit are sent into a comparator in the feedback control network together to be compared, and a PWM signal is generated to control the working state of the direct-current booster circuit. Therefore, closed-loop feedback is formed, the duty ratio and the output voltage of the direct-current booster circuit are adjusted in real time, dynamic impedance matching under different load conditions is achieved, generation of local triangular waves is not needed, the circuit is simplified to the maximum extent, and system power consumption is reduced.

The present invention belongs to the technical field of integrated circuits and relates to a stable on-chip clock generation circuit. The present invention includes a charge and discharge circuit, a comparator, and a timing logic circuit. Four switches are used in the charge and discharge circuit to jointly control the charging and discharging of the charging capacitor C1 to generate a linearly rising triangular wave signal. The compensation capacitor C2 in the charge and discharge circuit is used to offset the negative voltage mutation caused by the capacitor flip, effectively stabilizing the waveform and frequency of the triangular wave at the charging node VC. The comparator compares the charging triangular wave signal VC with the reference voltage source VREF, and the output signal is supplied to the timing logic circuit. The timing logic circuit is connected to the output of the comparator and is used to generate the first clock SW and the second clock SW_B, and the two are non-overlapping clock signals. By swapping the charging and discharging of the upper and lower plates of the capacitor C1 and combining with the compensation capacitor C2, the present invention can achieve rapid discharge of the charge on the capacitor, with a stable output clock frequency, a simple circuit structure, and low power consumption.

The invention discloses a penetration detection method of a multi-band modulated wave radar in a non-metal medium. The detection method comprises the following steps: constructing a multi-band hybrid modulated wave radar architecture; the sawtooth wave modulation mode and the triangular wave modulation mode are subjected to alternating or mixed waveform modulation; processing the hybrid modulated wave by adopting a near-field strong clutter suppression algorithm; estimating the distance of the target by adopting a wide-range target rough measurement algorithm; calculating the distance of the target by adopting a short-distance high-precision distance measurement algorithm; performing dynamic compensation on the measurement data by adopting a Kalman filtering state estimation algorithm to obtain a distance estimation result; complementary information of long-wave and short-wave radars is utilized to form a complete detection view. And intelligent collaboration of long and short wave data is realized through hierarchical fusion. Therefore, the system can simultaneously complete large-range transmission type detection and close-range millimeter-level high-precision measurement on one platform.

The present invention provides a novel displacement sensor based on time-space transformation. This time-difference displacement sensor includes: a first reflector for receiving a laser beam reflected by a first reflective surface of a triangular wave reflector and causing the laser beam to be reflected along the same path to the second reflective surface of the triangular wave reflector during measurement; a first laser shifter for uniformly shifting the laser beam reflected by the second reflective surface of the triangular wave reflector within a set range; a first photodetector and a second photodetector for receiving the laser beam translated by the first laser shifter twice within one translation cycle of the first laser shifter; and a processing system for calculating the displacement change of the measured object based on the time difference between the laser beams received by the first and second photodetectors and the translation speed of the first laser shifter. This invention can improve the measurement accuracy of the displacement sensor.