49results about How to "Simple detection principle" patented technology

The invention relates to a vibration sensor based on a surface acoustic wave radio frequency identification technology and application for the vibration sensor. The vibration sensor can be used for identifying the identity of a measured object in a radio frequency manner, and can also be used for monitoring whether the vibration acceleration of the measured object exceeds a set threshold value or not and then recording the vibration acceleration of the measured object; a surface acoustic wave device comprises an antenna, a piezoelectric substrate, an interdigital transducer, reflecting gratings and an elastic element; radixes in the reflecting gratings are used for coding radio frequency tags; the 1-3 reflecting gratings are connected with the elastic element, and then a normally open loop is formed; when the vibration acceleration induced by the vibration sensor exceeds the set threshold value, the reflecting gratings, the elastic element and matched networks jointly form a closed loop; and features of echo signals reflected back to a reader are changed, so that the vibration sensor can alarm after the vibration acceleration in a superthreshold is recorded. Compared with the prior art, the vibration sensor has the characteristics that a measuring method is simple, multidimensional and multi-range measurement can be realized, the vibration sensor is wide in application, and the like.

The invention provides a standing wave ratio detection method, device and equipment of an equipment output port, as well as a port standing wave ratio simulator, wherein the standing wave ratio detection method of the equipment output port comprises the following steps of: acquiring and storing the corresponding relationship between different standing wave ratios of the equipment output port and different temperature rises of an equipment load under different transmitting powers; and searching the corresponding relationship according to the acquired current transmitting power and the current load temperature rise of the equipment, and detecting the standing wave ratio of the equipment output port. The standing wave ratio detection method and device are easier to realize in the implementation difficulty level, and the standing wave ratio detection cost is lowered to a certain degree.

The invention discloses an OSC frequency automatic calibration circuit comprising a parameter generator, an OSC circuit, a frequency error detection circuit, a calibration ending judgment circuit and a parameter adding and subtracting control circuit. The frequency error detection circuit is connected with a reference time window signal and a center frequency indication signal, and frequency error detection is performed on a clock signal according to the reference time window signal and the center frequency indication signal, and a frequency error value is calculated. The calibration ending judgment circuit judges whether frequency automatic calibration is ended or not and whether frequency automatic calibration is successful or failed. When calibration is not ended, the parameter adding and subtracting control circuit outputs a parameter adding and subtracting control signal to the parameter generator and adjusts a control parameter, wherein the adjusting amplitude is directly proportional to the frequency error value. The invention discloses an automatic calibration method of the OSC frequency automatic calibration circuit. The circuit is simple in detection principle and small in circuit area. Parameter adjustment is directly proportional to the frequency error value so that calibration speed can be enhanced.

The invention relates to a precision test method of a two-freedom-degree tracking angle measurement device. The two-freedom-degree tracking angle measurement device is installed on a biaxial-rate-position turntable plane, and the turntable plane is level; a hexagonal mirror block is installed on the top surface of the two-freedom-degree tracking angle measurement device. The rotation angle of the table-board azimuth of the biaxial-rate-position turntable plane is used as a true value, a self-collimating light pipe system is used as a benchmark, the two-freedom-degree tracking angle measurement device can rotate in opposite directions, and tests are repeatedly carried out to obtain the azimuth tracking angle precision. An electronic level instrument is installed on the two-freedom-degree tracking angle measurement device to be leveled. The pitching rotation angle of the biaxial-rate-position turntable plane is used as a true value, a display value of the electronic level instrument is used as the benchmark, the two-freedom-degree tracking angle measurement device can rotate in the opposite directions, and the tests are repeatedly carried out to obtain the pitching tracking angle precision. By adopting the method, the test precision is guaranteed, the detection principle is simple, the simplicity in operation is realized, and the precision detection efficiency for a system-stage two-freedom-degree angle measurement device can be effectively improved.

The invention discloses a bridge cable damage electric detecting device and a bridge cable damage electric detecting method. The detecting device comprises a voltage regulating module, a voltage output guide wire, a current detector, a current amplifying module, a resistance calculating module, a resistance comparing module and a damage rate calculating module; the detecting method comprises the following steps: A, generating and detecting current; B, calculating the resistance; C, comparing the resistance; and D, calculating the damage rate. The resistance value is measured and calculated electrically, the area change value is determined according to the difference value between the measured resistance value and the theoretical resistance value, the detecting principle is simple; during specific detection, the voltage is only loaded to the two ends of the cable, so that only the current on the cable is needed to be measured; the specific operation steps are simple, during the measured result treatment, the measured current is amplified through a current amplifier for calculating the size of the resistance and amplifying the current value, so that the precise current value can be obtained, the calculating errors are small, and the calculated resistance value is relatively precise.

The invention discloses a combination gauge for abnormal bearing inner ring pore detection. The combination gauge comprises a plug gauge and a ring gauge which is used in cooperation with the plug gauge. One end of the plug gauge is a detection end for detecting whether the size of a bearing inner ring pore conforms to the tolerance requirement or not and the other end of the plug gauge is a positioning end used in cooperation with the ring gauge. The position where the ring gauge corresponds to the bearing inner ring pore is provided with a positioning hole which is matched with the positioning end of the plug gauge in an adapted mode. The positioning end of the plug gauge and the positioning hole of the ring gauge are mutually matched and used for detecting whether the position of the bearing inner ring pore conforms to the tolerance requirement. The invention further provides a method for detecting the bearing inner ring pore with the combination gauge. The combination gauge for abnormal bearing inner ring pore detection is simple in structure, capable of effectively detecting whether the size and the position of the bearing inner ring pore conform to the requirements or not and convenient to operate as detection steps are simple. A detection structure can be conveniently and directly obtained through observation.

The invention relates to a branch vehicle afflux early warning system for vehicles coming and going on a main road. The system comprises a branch vehicle detection system used for detecting branch vehicle appearance information through two-dimensional laser radar detection equipment, and a main road intelligent early warning sign used for prompting a main road driving vehicle through a detection result. The branch road vehicle detection system is arranged at the edge of a branch road and is 30-50 meters away from a branch road intersection, the two-dimensional laser radar detection equipment is vertically downward, and is installed facing a road, the main road intelligent early warning sign is arranged on a main road, is about 5-10 meters away from the branch road intersection and is arranged facing the direction of coming vehicles of the main road, and the branch road vehicle detection system is in real-time communication with the main road intelligent early warning sign in wired andwireless transmission modes. Compared with the prior art, the system has the advantages of stable, accurate, efficient and all-weather detection and the like.

The invention discloses a non-contact type on-line wheel-set profile detection method based on laser displacement sensors. The method comprises the following steps: sequentially setting a first laser displacement sensor and a second laser displacement sensor along the inner side of a track in a train advancing direction, and sequentially setting a fourth laser displacement sensor and a third laser displacement sensor on the outer symmetric side of the track, wherein laser sources of the first laser displacement sensor and the second laser displacement sensor are both on a same plane with the upper surface of the track; performing coordinate transformation on data points output from the laser displacement sensors, and extracting end surfaces and key feature points; measuring the distance between the laser displacement sensors and a tire tread when the circle center of a wheel is on central lines of the first laser displacement sensor and the second laser displacement sensor, and calculating the diameter of the wheel according to geometric relationships; and acquiring outlines of two tire treads through data fusion, and further acquiring a mean value of two groups of wheel flange parameters. The method has the advantages of being simple in structure, high in precision and high in stability.

The invention discloses a method for judging a bearing fault based on CEEMDAN decomposition, electronic equipment and a storage medium, and the method comprises the steps: carrying out the CEEMDAN decomposition of an original acceleration signal of a bearing, and obtaining an intrinsic mode function component; calculating the kurtosis K of the intrinsic mode function component of each layer, and adding the corresponding values of the intrinsic mode function components of each layer with the kurtosis K greater than a set value to obtain a reconstructed acceleration signal; performing envelope demodulation on the reconstructed acceleration signal to obtain an envelope spectrum; calculating a bearing characteristic frequency according to the bearing signal and the rotating speed; and checking the amplitude of the characteristic frequency of the bearing in the envelope spectrum, and if the amplitude of a certain characteristic frequency exceeds an envelope threshold value, determining that the bearing part corresponding to the characteristic frequency has a fault. According to the invention, the signal resolution can be effectively improved, the interference of noise and other vibration signals can be weakened, and the loss and mode overlapping of fault signals can be avoided. The detection capability of weak fault characteristic signals is obviously improved, and the fault part of the bearing can be effectively identified.

The invention relates to a road concave-convex object detection method and device, and relates to the technical field of intelligent traffic. The method comprises the following steps: firstly, acquiring an acceleration signal of each wheel of a vehicle, carrying out framing processing on the acceleration signal, and respectively calculating an acceleration difference and an acceleration multiple ratio of each frame of acceleration signal of each wheel; if the corresponding acceleration multiple ratio is larger than the corresponding preset acceleration multiple ratio threshold value, it is judged that the corresponding wheel passes through the concave-convex object in the corresponding frame, data information of each concave-convex object passed by the vehicle is obtained, and the data information of all the concave-convex objects is transmitted to a traffic department server; and the traffic department server evaluates each concave-convex object by using the data information of the concave-convex objects and the vehicle information of the corresponding vehicle. According to the road concave-convex object detection method provided by the invention, the problems that the detection effectiveness of the concave-convex object on the road is poor, the accuracy of the detection structure is low and the overall efficiency needs to be improved in the related technology are solved.

The invention discloses pH-responsive conjugated polymer nanoparticles, a preparation method and applications thereof. The preparation method comprises the following steps: uniformly mixing ultrapurewater and anhydrous acetonitrile to obtain a mixed solution; keeping the mixed solution in an ultrasonic state at a temperature of 20-35 DEG C, adding a mother liquor into the mixed solution in a dropwise manner, and continuously carrying out ultrasonic treatment for 1-2 hours after dropwise adding is completed to obtain a solution M, wherein the preparation method of the mother liquor comprises the following steps: dissolving a polythiophene derivative in chloroform to obtain a polythiophene derivative mother liquor with a concentration of 1-2 mg/mL; and introducing nitrogen into the solutionM, and removing chloroform and acetonitrile to obtain the pH-responsive conjugated polymer nanoparticle aqueous solution. The pH-response conjugated polymer nanoparticle has the characteristics of good biocompatibility, high fluorescence intensity, low toxicity and the like, can be used for accurately measuring the weakly acidic pH value in an aqueous solution, and can also be used for sensitivedetection and fluorescence imaging of tumor cell microenvironment response.

The invention provides a method for detecting flow field gangue coal of a dense-medium shallow-slot sorting machine. The method is characterized by comprising the following steps of: acquiring the density of a gangue coal seam mixed solution, comparing the density with a density threshold value of the gangue coal seam mixed solution when a gangue coal seam is in a blocked state, and judging that the gangue coal seam is in the blocked state when the density of the gangue coal seam mixed solution is greater than the threshold value. According to the detection method and the detection device, theblocked state is reflected by utilizing the density change of the gangue coal seam, the detection principle is simple, the detection effect is accurate, the real-time property is high, an alarm signal can be timely sent when the density exceeds the threshold value when the gangue coal seam is accumulated more and more, and the blockage of the whole flow field is avoided.

The invention discloses a multi-axis turntable angle positioning error detection method based on a single-axis laser gyro goniometer, wherein the method comprises the steps: electrifying the single-axis laser gyro goniometer, preheating for 30 minutes, mounting the single-axis laser gyro goniometer mounted in a fixture on a working table surface of a multi-axis turntable, and calibrating an offset value B0 of the single-axis laser gyro goniometer; rotating the measured shaft of the multi-shaft turntable, and enabling the single-shaft laser gyro goniometer to output corresponding pulses and count the output pulses; according to the scale coefficient K of the single-axis laser gyro goniometer and the output pulse number corresponding to the measured shaft, calculating an angle measurement value [theta]i of the measured shaft measured by the single-axis laser gyro goniometer; performing sine curve fitting on the angle measurement error value [delta][theta]i according to the angle measurement value [theta]i of the measured shaft, and calculating the angle measurement error value [delta][theta]i introduced by earth rotation according to the projection angle of a sensitive shaft of the single-shaft laser gyro goniometer; and eliminating the angle measurement error value [delta][theta]i introduced by earth rotation, and calculating an angle positioning error of the measured shaft.

The invention provides an online detection system for vibration of an elevator traction motor, which is characterized by comprising a sensor, a signal processing module, a data processing module, an alarm device, a motor control device and a power supply, wherein the power supply provides electric energy for all electrical components of the detection system; the sensor is used for collecting a vibration signal of the traction motor; the signal processing module is used for acquiring and amplifying data acquired by the sensor; the data processing module is used for storing, analyzing, displaying and judging the processed signal data; and the data processing module is in signal connection with the alarm device and the motor control device. The beneficial effects of the invention are that bymeans of fixing external equipment at a to-be-detected point of the motor, the detection equipment is convenient to disassemble, and the maintenance cost is low; and through information acquisition and analysis of regular change of current flowing through a capacitor line, the fact that the motor works abnormally is discovered at the first time, and the detection principle is simple.