80results about How to "Improve the ability to resist environmental interference" patented technology

The invention relates to a method for fixing a focus and measuring a curvature radius by confocal interference, and belongs to the technical field of optical precision measurement. The method comprises the following steps of: introducing interfering reference light based on a confocal light path; precisely positioning an apex of the surface of a tested spherical element and a location of the centre of a sphere by using the maximum value of a confocal interference response curve to obtain the curvature radius of the surface of the tested spherical element; and maximumly sharpening a main lobe of the confocal response curve. By the invention, the traditional confocal interference microscopy imaging technique is first applied to improvement on the fixed-focus precision of an optical measuring system, so that the optical measuring system has a higher axial resolution and a simple structure, and the research and development costs of the system device are reduced.

The invention discloses an extensible semiconductor resistive flexible gas sensor with micro-wrinkle film structure and a preparation method thereof. Insulating substrate-polyacrylate double-sided foam tape (VHB, very high bond) that is extensible is unilaterally pre-extended to certain extent and fixed to a rigid substrate; a patterned graphene electrode and a colloidal quantum dot film are prepared on a VHB substrate that is pre-extended, and the sensor is prepared by retracting the VHB substrate slowly. The gas sensor prepared in the method has a gas-sensitive layer of micro-wrinkle film structure and a patterned graphene electrode, the gas sensor features extensibility, manufacturing temperature and operating temperature of the sensor can be lower than room temperature, transient or minor changes in gas concentration can be detected at room temperature, and the gas sensor has high response restoring speed and sensitivity, has certain resistance to ambient humidity interference and has better long-term stability.

The invention relates to a device for monitoring foreign matters between a rail transit platform door and a train based on machine vision, wherein the device collects visible light images, infrared light images and depth images between the rail transit platform door and the train, integrates the visible light images, the infrared light images and the depth images to form three-dimensional space three-dimensional images, which can cover all targets in a shooting visual angle; events can be identified in the images by analyzing the data of the three-dimensional images, wherein the main events comprises: whether or not foreign objects exist in the track area, whether or not the train is at the station, the number of trains, the switch status of the platform door and the train door, the door seam of platform sliding door and train door, whether or not foreign objects inrude into the portion between the train and the platform door, the size and type of foreign objects, whether or not the foreign objects affects driving safety and the like; the device drives the foreign object alarm safety relay, and transmits the monitoring result and live real-time image in real time. The device can achieve no dead angle and full-area detection in an area, is not influenced by vehicle type, gap space size, vibration and environmental illumination, is suitable for underground, ground and ground platform environments, and is suitable for unmanned environments.

The invention relates to a measuring system for the expansion coefficient of a material. The measuring system is characterized by comprising two solid microchip laser feedback interferometer optical systems and an electrical logging and electric control system, wherein a heating furnace is arranged between the two solid microchip laser feedback interferometer optical systems and comprises a furnace chamber; a cavity is formed in the furnace chamber; a perforating hole is symmetrically formed in the two opposite sides of the cavity outward respectively; a perforating hole packaging structure is fixedly arranged at the outer end part of each perforating hole; a window plate is fixed outside each perforating hole packaging structure through a window plate clamping seat; a sample table device capable of accommodating a sample to be measured is further arranged in the cavity body; a heating element and a temperature sensor are fixedly arranged on the inner wall of the furnace chamber in a suspended mode. The measuring system for coefficient of liner expansion has the advantages of complete non-contact, high precision, large temperature measuring range and high resistance to shock, and is particularly suitable for a relatively low surface reflecting material. The measuring system can be widely applied to large temperature range and high precision measurement of expansion coefficient of various materials.

The invention relates to an intermediate infrared femtosecond laser and a parametric amplifier thereof. The intermediate infrared femtosecond laser and the parametric amplifier thereof comprise an OPA femtosecond pump laser, a signal light illuminant, a device with a wavelength beam combination function and a periodical polarization second nonlinear crystal, wherein the device with the wavelength beam combination function is arranged on an exit channel of the OPA femtosecond pump laser and the signal light illuminant and has the function of being used for overlying pump light sent by the OPA femtosecond pump laser and signal light sent by the signal light illuminant, the periodical polarization second nonlinear crystal is used for converting the overlaid pump light and the signal light to output idler beams. The intermediate infrared femtosecond laser and the parametric amplifier thereof have the advantages that the structure is simple, the cost is low, the modulation is simple, the ability to resist environmental interference is high, the high optical quality output can be achieved, the conversion efficiency is high, the repetition frequency is high, and the miniaturization and the portability are facilitated.

The invention discloses a fiber-optic gyroscope modulation and demodulation method. The method comprises the following steps: carrying out intrinsic square wave modulation on optical waves through Y waveguide by using a pi/2 + kpi modulation amplitude, wherein k is an integer; respectively sampling the optical power reaching a detector in the positive and negative half periods in every modulation period to obtain parity sampling values; obtaining a difference between the parity sampling values in the period according to the parity sampling values in every modulation period and the sum value of the parity sampling values in the period; and dividing the difference between the parity sampling values by the sum value of the parity sampling values, adopting the ratio as a demodulation signal, and resolving the demodulation signal to obtain the phase difference induced by fiber-optic ring rotation and rotating angle velocity information. The demodulation method can inhibit the gyroscope drift phenomenon caused by the optical power and optical path loss.

The invention discloses an acupoint positioning system and method based on combination of binocular vision and coded structured light. The method comprises the following steps of performing three-dimensional reconstruction on the human body back model, restoring two-dimensional coordinates shot by the camera into three-dimensional coordinates in a world coordinate system, segmenting the human bodyback model from the image, and finding out corresponding acupoint information of the human body back in combination with traditional Chinese medicine. The two cameras and the structured light are adopted to reconstruct the three-dimensional information of the back, and the positioning accuracy is further improved. Coding structured light and binocular vision are combined, the problems of indoor white walls and texture-free objects are effectively solved, the environment interference resistance is enhanced, the reliability is higher, and the depth image quality is greatly improved.

The invention discloses a laser confocal/differential confocal Raman spectrum vibration parameter measurement method, and belongs to the technical field of optical precision measurement. Confocal vibration detection, differential confocal vibration detection and Raman spectrum detection technologies are fused, nondestructive separation is carried out on Rayleigh light and Raman scattered light byutilizing a dichroic light splitting system, spectrum detection is carried out on the Raman scattered light, and vibration parameter detection such as amplitude and frequency is carried out on the Rayleigh light. Therefore, the vibration information testing method capable of simultaneously detecting the vibration parameters of the sample micro-area and the Raman spectrum of the vibration of the sample micro-area is formed. According to the invention, the confocal Raman microscope and the differential confocal Raman microscope have the capability of simultaneously detecting micro-area vibrationparameter information and the Raman spectrum of micro-area vibration. The method has the advantages of high vibration measurement precision, wide amplitude measurement range, high frequency measurement bandwidth, high spectrum detection sensitivity, capability of measuring periodic motion and aperiodic motion, high environmental interference resistance and the like. Meanwhile, high-precision detection of micro-area vibration parameters and vibration spectral characteristics is carried out, and the method has a wide application prospect in the technical field of optical precision measurement.

The invention relates to a kernel density estimation-based license plate character segmentation method. At present, the conventional methods have the defect that binaryzation cannot be performed well under the extreme condition. The method comprises the following steps of: performing preprocessing of normalization, edge sharpening and noise removal on a license plate image; determining a character area of a license plate; finding a pixel value of which the probability of occurrence is maximum in the current kernel probability density curve and the kernel density half width of the point, and performing image binaryzation by utilizing the two parameters; and extracting a segmentation result of which the score is maximum within the width range to be used as a final character segmentation result. By the method, the distribution of character pixels can be determined accurately; and compared with the common iteration binaryzation method, the method has the advantage that the ambient interference resistant capacity is enhanced greatly.

The invention discloses a full positive dispersion and full polarization maintaining optical fiber laser. The full positive dispersion and full polarization maintaining optical fiber laser comprises a first optical fiber coupling Faraday polarization rotating mirror, a ytterbium-doped fiber, a wavelength division multiplexer, a pump light isolator, a semiconductor laser LD, a polarization maintaining optical fiber coupling polarization beam splitter, a polarization maintaining optical fiber coupling total reflecting mirror, a polarization maintaining optical fiber coupler, a polarization maintaining single-mode fiber, a second optical fiber coupling Faraday polarization rotating mirror and a narrow-linewidth band-pass filter. Through the design of a cavity structure, when laser pulse has a single round trip in an optical fiber laser cavity, the laser pulse is amplified multiple times, pulse gains are increased, and the single pulse energy of output light pulse is higher. Through the optical fiber coupling Faraday polarization rotating mirrors at the two ends of a standing wave cavity, the whole optical fiber laser cavity compensates the linear noise and disturbance caused by the environment and is not influenced by the outside. The full positive dispersion and full polarization maintaining optical fiber laser is simple in structure, easy to debug and small in environment interference, and has broad application prospects in the industrial field.

Provided in the invention is a following shooting device comprising a high-speed shooting and recording system, a large-view-field passive detection system, a following shooting trigger signal emission system, an image stabilization compensation platform and a control and data storage processing system. The high-speed shooting system comprises a high-speed following shooting camera and a fast oscillating mirror. When a target transmitting command is sent out, a trigger signal is synchronously transmitted to the following shooting trigger signal emission system; the trigger signal simultaneously controls the high-speed shooting and recording system and the large-view-field passive detection system to start working; the large-view-field passive detection system outputs a target correction signal to the fast oscillating mirror and the image stabilization compensation platform in real time to complete real-time correction of the angle of the fast oscillating mirror and fine adjustment of the detection view field of the large-view-field passive detection system; and after data acquisition and reception, a final image is analyzed and acquired through the control and data storage processing system. According to the following shooting device, closed-loop control over the fast oscillating mirror is achieved, the angle of the fast oscillating mirror is corrected in real time, and the shooting success rate and shooting quality can be greatly improved; and the following shooting device has the advantages of being high in precision, resistant to interference, high in adaptability and the like.

The invention relates to the technical field of optical measurement, and discloses a self-focusing lens refractive index distribution detection system and method in order to solve the problem of low refractive index detection precision caused by poor environmental interference resistance of an existing self-focusing lens refractive index distribution detection method. The front surface of a self-focusing lens reflects a collimated light beam to form a reference light beam, a test light beam is formed through reflection by the rear surface of the self-focusing lens, interference fringes generated by the reference light beam and the test light beam are reflected by a beam splitter and then enter a microscopic imaging system, an image processing system processes the interference fringes of the self-focusing lens collected by a camera, and the refractive index distribution of the self-focusing lens is obtained by analyzing the information of the interference fringes. According to the self-focusing lens refractive index distribution detection method based on the Fizeau interference principle, high-efficiency and high-precision self-focusing lens refractive index distribution detection is achieved, and meanwhile the Fizeau interferometer system has the advantages of being high in anti-interference capacity and small in size.

The invention provides a wearable pilot display system and a head attitude positioning method. The system comprises a wearable display, a head attitude positioning system, a first processor and a second processor. According to the system, the wearable display and the head attitude positioning system which are stable schemes relative to a pilot head are employed, so a pilot who turns to observe in any direction is enabled to see a character frame provided by the wearable display system. On one hand, the work angle scope of the head attitude positioning system is expanded through the wearable pilot display system and the head attitude positioning method, on the other hand, environment interference prevention capability of the head attitude positioning system is further improved. The wearable pilot display system is advantaged in that safety is improved.

The invention belongs to the field of microbial electrochemistry, and particularly relates to a method for improving the property of a microbial fuel cell sensor by quorum sensing from a microbial level. The method comprises the following steps that: in the whole operation process of a MFC (Microbial Fuel Cell) sensor, adding quorum sensing autoinducer into culture solution; and after the MFC sensor is stably started, applying the MFC sensor to water environment heavy metal sensing. A microbial quorum sensing phenomenon is used for regulating and controlling the electrogenesis bacteria ratio and the activity of an MFC sensor anode biological membrane. Compared with the prior art, the method disclosed by the invention can effectively solve the problem that the sensor property is lowered since an anode biological membrane dead cell ratio is overlarge, the method has the advantages of being simple in operation and stable in effects, the sensing flexibility and the toxic impact resistanceof the MFC sensor can be effectively improved, and a process that the MFC sensor realizes in-situ online monitoring is quickened.

The invention discloses an analysis method of oil spill weathering time based on a reflectance spectrum, and application. The method analyzes and inverts the weathering time of an oil spill film basedon differences in reflectance spectrum data caused by changes in physicochemical properties of the oil spill film at different weathering times, and respectively establishes a measurement model of the weathering times of the oil spill film from a reflectance characteristic peak and an overall correlation analysis method of the measured reflectance spectrum and the data in a reflectance spectrum database, which improves the ability of anti-environmental interference both from the microscopic characteristics of the reflectance spectrum and the overall macroscopic correlation, and realizes the inversion and measurement of the weathering time of the oil spill film. While determining the oil spill weathering time, the analysis method provided by the invention determines the oil type based on the characteristics of the reflectance spectrum of the oil spill film, can carry out the inversion of the weathering time of the oil spill film in a targeted manner, has stronger pertinence and improves the accuracy of the weathering time inversion.