16 results about "He ne laser" patented technology

The application discloses a photoacoustic spectrum signal detection system and a detection method. The system comprises a signal acquisition device and a detection signal processing terminal. The signal acquisition device comprises an ultraviolet pulse laser, a first plano-convex lens, a second plano-convex lens, a focusing objective lens, a refractive prism, a helium-neon laser, an electric displacement platform, a polarization modulation assembly, a light splitting assembly and a differential detector. The photoacoustic spectrum signal detection system uses the specific absorption of cell nuclei to ultraviolet light, obtains a differential detection signal through the differential detector and generates an analysis spectrum. The light sensing assembly collects a light sensing signal of the sample and generates a microscopic image. The detection system can realize photoacoustic spectrum analysis of a cell nucleus level micro-sized absorber, thereby obtaining a high-resolution analysis spectrum and a microscopic image reflecting the physical properties inside the cell nuclei. The label-free and non-staining photoacoustic spectrum signal detection does not need staining and can save detection time, and the accuracy of cell detection on biological samples is improved.

The application discloses a vortex light interference device and method for measuring three-dimensional vibration and sound field rotation characteristics, wherein a helium-neon laser emits laser light, the laser light passes through a half-wave plate and a first polarization beam splitter prism, and is divided into object light and reference light; the object light passes through a first spiral phase plate and becomes vortex object light, the vortex object light passes through a second polarization beam splitter prism, a quarter-wave plate, and a beam expander lens, and is irradiated on a test sample surface, reflected light of the sample surface passes through the beam expander lens, the quarter-wave plate, the second polarization beam splitter prism, a beam splitter prism and a focusing lens, and is irradiated on a photodetector; the reference light passes through an acousto-optic modulator to generate frequency modulation, passes through a mirror and a second spiral phase plate to become frequency-modulated vortex light, and the vortex light passes through a beam splitter prism and a focusing lens and is irradiated on the photodetector; a computer calculates and demodulates frequency-modulated signals of the photodetector and modulation signals of the acousto-optic modulator, and finally obtains three-dimensional vibration information and sound field rotation characteristics of the sample.

The application discloses a laser optical axis debugging device and a debugging method, which comprise a fixing base, a laser generating mechanism, a target plate and a conversion base, the laser generating mechanism is arranged on the fixing base, one end of the laser generating mechanism is formed with a laser emission port, the target plate is arranged in a spaced mode with the laser generating mechanism, a through hole is formed in the middle of the target plate, the center of the through hole is coaxially arranged with the center of the laser emission port, the conversion base is sleeved on one side of the laser generating mechanism close to the laser emission port, and a laser to be debugged is sleeved outside the conversion base. The helium-neon laser and the reflecting mirror of the existing coarse adjustment scheme can be replaced, the formed collimating light path can solve the technical problems of low precision, large debugging difficulty, low stability and reliability of the optical axis of the prior art which are restricted by the site and equipment factors.

The application discloses a kind of based on valley power lockout semi-out cavity linear polarization interference light source and its design method.The device includes laser power supply, laser, heating wire, heat preservation glue, beam splitter BS, PD photocell and laser frequency stabilization system;Design method is crucial in that: the laser is three longitudinal mode semi-out cavity linear polarization helium-neon laser, laser built-in Brewster window, and the key parameters of the laser are calculated by longitudinal mode light intensity coupling model, two side modes can be completely suppressed, form the high proportion valley bottom in light intensity harmonic curve, to facilitate frequency stabilization algorithm identification to realize central longitudinal mode frequency locking.The method of the application can make the output power of the laser reach 2.4mW or more, overcome the shortcomings of traditional double longitudinal mode frequency stabilization interference light source power limitation, improve single mode power conversion efficiency, provide a new type of frequency stabilization technology and new type of interference light source for the rapid development of ultra-precision machining and measurement technology and various fields such as single mode conversion complete, high output power, good wavelength stability.

The utility model discloses a rapid assembling and adjusting device for a space beam combining reflector group. The rapid assembling and adjusting device comprises a helium-neon laser (1), a total reflection mirror (2) with a center hole, a rotary table simulation mechanism (3), a reflector diaphragm (4), an autocollimator (5), an internal diaphragm (6), a beam combining box (7) and a primary mirror (8). A helium-neon laser (1), a total reflection mirror (2) with a center hole and an internal diaphragm (6) are coaxially installed on the rotary table simulation mechanism (3) from top to bottom. The rotary table simulation mechanism (3) is arranged at the center of the top surface of the beam combining box (7); the primary mirror (8) is arranged in the beam combining box (7) and is positioned right below the internal diaphragm (6); the mirror surface of the primary mirror (8) is provided with a reflector diaphragm (4); and the autocollimator (5) is erected outside the beam combining box (7), and the emergent light of the autocollimator (5) is consistent with the reflected light path of the primary mirror (8). According to the utility model, the autocollimator is adopted to replace laser of different wavebands, is not limited by the adjustment of the target wavebands, is suitable for the adjustment of the combined space beam combining system, and is wide in application range and strong in practicability.

This invention provides an intelligent control system and method for optimizing the intracavity mode of a high-reflectivity cavity mirror helium-neon laser. The system includes: a mode detection module for real-time detection of the output beam of the high-reflectivity cavity mirror helium-neon laser using a beam analyzer and photoelectric sensors to acquire monitoring data; an intelligent control module for analyzing the monitoring data based on machine learning algorithms and automatically adjusting the angle and position of the high-reflectivity cavity mirror according to optimization requirements; and a compensation module for compensating for laser performance based on environmental and monitoring data. This invention's intelligent control system and method for optimizing the intracavity mode of a high-reflectivity cavity mirror helium-neon laser monitors and optimizes the intracavity mode of the helium-neon laser in real time, greatly improving the output beam quality and stability of the laser. The system can adapt to environmental changes, reducing manual intervention and significantly improving the system's control accuracy and efficiency.

The application discloses a kind of based on locking confocal F-P cavity laser sweep quantity accurate control and determination device and method.The device is by the wave division multiplexing of low-frequency electro-optic phase modulator to realize the locking of confocal F-P cavity length relative to helium-neon laser and the locking of tunable laser frequency relative to confocal F-P cavity at the beginning and end of scanning;Before laser scanning, confocal F-P cavity free spectral range FSR is measured by high-frequency electro-optic phase modulator with microwave frequency reference, and the number of scanning resonance peaks between two laser frequency lockings is counted to realize sweep quantity control and determination.The application realizes the control and measurement of laser frequency scanning quantity in frequency scanning interference method, improves the stability of confocal F-P cavity FSR as scanning frequency reference, and realizes high-precision measurement of FSR with microwave frequency reference, so as to improve the frequency scanning measurement accuracy, so as to improve the accuracy of sweep absolute ranging.

The invention discloses a polarization type measuring device and method based on vortex light interference, and belongs to the technical field of laser interferometers. Laser emitted by a helium-neon laser passes through a first lens group to be split into horizontal line polarized light and vertical line polarized light; the horizontal line polarized light serves as a measurement light beam, and the displacement variation to be measured is regulated and controlled through phase control of the first phase control assembly; the vertical linearly polarized light reference light beam realizes phase locking; and the displacement variation is calculated according to the light spot rotation angle value obtained by the light spot analyzer. The designed phase-locking control system obtains interference light intensity in real time and then adjusts voltage output to piezoelectric ceramics to complete phase locking, and interference of the external environment on the whole light path system is overcome. In addition, the phase-locked control system designed by the invention can realize locking of any phase, and has a great assistance effect on a traditional intensity type interferometer.

The application discloses a system and method for detecting furfural based on a Moire-enhanced differential photothermal lens spectrum, wherein a quantum cascade laser is used as a pumping light source, a helium-neon laser is used as a detection light source, and a dichroic mirror is used to realize coaxial incidence of the pumping light and the detection light; the pumping light is chopped and modulated and focused into a fixed optical path liquid pool to excite a thermal lens effect; the detection light is diffracted by a sample to generate a diffraction circle; the diffraction circle is subjected to spatial beat frequency amplification by a Moire circle grating; then, the diffraction circle enters a silicon bias photodetector through a variable diaphragm; a detection signal is differentially demodulated by a lock-in amplifier and processed by an upper computer. By using the spatial beat frequency amplification effect of the Moire circle grating, optical amplification is realized, and the sensitivity of the detection system is greatly improved; in combination with a differential detection structure, common-mode noise caused by light source power fluctuation, environmental vibration and temperature drift is effectively suppressed, and the signal-to-noise ratio and long-term stability of the detection system are greatly improved.

The invention provides an infinitesimal displacement measurement method and system based on a laser self-mixing interferometer, and relates to the technical field of displacement measurement, and the method comprises the steps: obtaining a to-be-measured object; the method comprises the following steps: modulating a self-mixing interferometer through a sinusoidal phase of a helium-neon laser, and extracting an interference signal containing displacement information of an object to be measured; extracting an in-phase component and an orthogonal component from the interference signal through a phase generation carrier technology to form an orthogonal signal pair; correcting a Lissajous figure generated by the orthogonal signal pair by using an ellipse fitting algorithm to obtain a corrected orthogonal signal pair; phase demodulation is carried out on the corrected orthogonal signal pair, and phase information of the object to be measured is extracted; and determining the displacement of the to-be-measured object based on the phase information. According to the method, the ellipse fitting algorithm is used for correcting the Lissajous figure generated by the orthogonal signal pair, non-ideal factors are effectively compensated in the process, the phase demodulation precision is guaranteed, and the displacement measurement accuracy is remarkably improved.

The invention provides an electronic water pump multi-mode cooperative control method and system based on LIN / PWM communication, electronic equipment and a storage medium, and relates to the technical field of vehicle thermal management systems.The method includes the steps that a vehicle turbocharging system pipeline pressure signal is collected, and frequency band energy analysis is conducted to obtain frequency spectrum energy information; a laser beam is emitted by the surface of an intercooler of a helium-neon laser, and vibration signals are inverted to obtain vibration mode information; the conditional generative adversarial network establishes a pressure and vibration incidence relation and generates a system coupling confidence parameter; multi-water pump working point distributed optimization is carried out to generate a cooperative control instruction; constructing a PWM signal sequence to form a control signal; and finally, a control signal is transmitted in a time division multiple access mode based on the LIN / PWM communication bus, and multi-mode cooperative control of the electronic water pump is achieved. Intelligent cooperative control of multiple electronic water pumps in a vehicle thermal management system can be realized.

The present invention discloses a quantitative laser speckle blood flow imaging method based on a neuromorphic visual sensor. This method relates to the field of biomedical engineering technology and addresses the problem in traditional laser speckle contrast imaging methods where static scattered light caused by physiological behavior and electronic noise from the imaging device adversely affect the quality of blood flow imaging. The method comprises the following steps: Step 1: Using a helium-neon laser as a light source, an expanded laser beam is irradiated onto a scattering medium to form a speckle pattern; Step 2: Using a microfluidic syringe, the syringe's inner diameter and flow rate are set to control the flow rate range; Step 3: Using an event camera to asynchronously sense changes in the speckle pattern's light intensity, and capturing the speckle pattern using a "frame" camera; Step 4: The event camera acquires event stream data, which is then processed using an algorithm. This method achieves real-time, high-resolution blood flow imaging and flow rate calculation, overcoming the inherent limitations of traditional methods.

The visible light waveband semiconductor laser microlens assembling and adjusting device belongs to the technical field of semiconductor laser optical assembling and adjusting, and is characterized in that a six-dimensional optical adjusting frame, a helium-neon laser system, an imaging monitoring system, a light spot image acquisition system, a beam quality detection system, a beam splitter, a focusing mirror I, a focusing mirror II and a laser heat sink are arranged on an optical platform, a lens clamp is arranged on the optical adjusting frame, and a semiconductor laser is arranged on the laser heat sink. The helium-neon laser is used to adjust the angle of the microlens, and the laser emitted by the semiconductor laser is used to irradiate on the beam quality analyzer and the CMOS to test the index and the collected image, so that the microlens is adjusted to the best position, and the assembling and adjusting precision is high.

The application discloses a device for generating annular structured light and a preparation method thereof, and the device comprises a helium-neon laser, a polarizer, a liquid crystal cell, an LED ultraviolet light source and a CCD which are sequentially arranged; the liquid crystal cell comprises two layers of substrates which are coated with orientation films, spacer particles and a liquid crystal layer, the spacer particles are arranged between the two layers of the orientation films of the substrates which are opposite to each other, and a filling space is formed for injecting the liquid crystal layer; the method for generating the annular structured light comprises three parts of preparation of a reconfigurable liquid crystal superstructure system, light path building and annular structured light acquisition. The application realizes the generation of the annular structured light by using the liquid crystal material, and the method for generating the amplitude type structured light by using the reconfigurable liquid crystal superstructure system has the advantages of simplicity, quickness, flexibility, reliability, low cost, reconfigurability and integration.

The present invention relates to the field of optical communication-related computing technologies, and specifically to an experimental method and apparatus for measuring the orbital angular momentum spectrum of a vortex beam based on coaxial interferometry. The method comprises a helium-neon laser, a beam expansion and collimation system, a spectroscopic modulation component, a spatial light modulator, a phase polarization adjustment component, and a charge-coupled device (CCD) camera. The spatial light modulator is disposed on the optical path of the Gaussian beam output by the helium-neon laser, and a CCD camera is disposed at the end of the optical path of the beam modulated by the spatial light modulator. The beam expansion and collimation system and the spectroscopic modulation component are coaxially disposed in sequence on the optical path between the helium-neon laser and the spatial light modulator, and the phase polarization adjustment component is coaxially disposed on the optical path between the spatial light modulator and the CCD camera. The present invention utilizes a small amount of experimental equipment to achieve stable coaxial interferometry of a vortex beam and accurate measurement of the orbital angular momentum spectrum, greatly reducing the difficulty of constructing the experimental interferometric optical path.

The application is a laser Doppler rotational speed calibration device, belonging to the technical field of Doppler velocity measurement, comprising a shell, a regulating cavity is formed in the inner side of the shell, an installation cavity two is formed in one end of the regulating cavity, an installation cavity three is formed in the end of the installation cavity two away from the regulating cavity, and a helium-neon laser is arranged in the inner side of the installation cavity three. The application solves the problem that only the inner cavity of the rotating drum can be detected, which requires the laser to be obliquely shot into the inner cavity of the rotating drum, and since the diameter and depth of the rotating drum of each centrifuge are different, the laser directly irradiating the rotating drum is hindered. In the application, the laser focusing points of the first and zero levels can be adjusted through the use of the sliding block, so as to facilitate the automatic adjustment of the detection distance of the device, make the laser focusing points hit the detection column, so that the outer side of the detection column is hit, and the rotation of the detection column can be detected, and the laser can directly hit the detection column horizontally.