124results about How to "Reduce the impact of detection accuracy" patented technology

The invention discloses a perimeter intrusion detection method, device and system. The Doppler microwave radar sensor is set on the enclosure in advance, the method includes: collecting the I/Q channel signal generated by the Doppler microwave radar sensor according to the received reflection echo, the I channel signal is an in-phase component, and the Q channel signal It is an orthogonal component; the collected I/Q channel signal is analyzed and processed for intrusion; according to the processing result, a warning message is sent to the terminal server, and the warning message is used to instruct the terminal server to alarm or eliminate the alarm. In this scheme, the electromagnetic waves emitted by the Doppler microwave radar sensor are used for intrusion detection. Since the electromagnetic waves are less disturbed by climate and environmental factors, the impact of climate and environmental factors on the detection accuracy of enclosure intrusions can be effectively reduced.

The invention discloses a battery management system and a balanced state online monitoring method thereof. The battery management system comprises a micro-control unit, a battery voltage detection circuit controlled by the micro-control unit, a battery voltage balancing circuit controlled by the micro-control unit and a battery. The battery management system has the remarkable advantages of being capable being supported to be a large current balancing system; reducing the effect of balancing current on the voltage detection accuracy; being capable of completely separating voltage detection and battery balancing by aid of the framework design mode that single harness and dual channels are adopted for balancing harnesses and voltage detection harnesses which do not affect each other functionally, and meanwhile, not affecting complexity of system harness distribution due to the fact that the single harness and dual channel design is adopted for the harnesses and the quantity of the harnesses is as same as that of the original harnesses performing balancing by aid of the voltage detection harnesses; and being capable of monitoring balancing circuit impedance in real time and accordingly finding whether the balancing harnesses are opened or damaged timely.

The invention relates to a method and a system for realizing remote sensing image target detection based on a deep neural network, and a storage medium thereof, so as to realize detection of horizontal and rotary arrangement targets of a remote sensing image. According to the method, an anchor point box generation module is designed, an anchor point box is generated in a self-adaptive mode throughfeature information of different positions, and the influence of the difference of preset anchor point boxes on detection precision is reduced; aiming at the characteristic that more small targets exist in a remote sensing image, an improved feature pyramid structure is provided, and deep and shallow layer feature information is fused by adopting a transposed convolution method; aiming at difficulties such as complex background of a remote sensing image, a receptive field expanding module is adopted to extract more characteristic information, and the detection precision of a small target under a complex background is improved; a SmoothLn function is adopted as regression loss, so that the algorithm performance is further improved; for a rotation arrangement target, regression of an anglefactor is introduced to realize rotation frame detection. In addition, in order to facilitate the use of a user, the remote sensing image target detection system designed by the invention has the functions of horizontal frame and rotary frame detection and result statistics.

The invention belongs to the technical field of chemical ingredient detection, and particularly relates to a method for detecting multiple kinds of vitamin simultaneously. According to the detecting method, multiple lipid-soluble vitamin samples contained in a sample can be fast and accurately measured simultaneously through a two-dimensional liquid chromatographic analysis method. According to the method, effluent in a specific period of a one-dimensional chromatographic column is injected to a two-dimensional chromatographic column, effluent of the two-dimensional chromatographic column is subjected to vitamin D measurement, the other effluent of the one-dimensional chromatographic column is subjected to measurement of non-vitamin D lipid-soluble vitamin, peakoverlap of vitamin D and other lipid-soluble vitamin can be avoided, and the influence of lipid matter in the sample on the detection accuracy of vitamin D is effectively reduced. According to the detecting method, the normal-phase column purifying process on vitamin D in a traditional method can be omitted, tedious detecting steps are simplified, detection time is saved, and high accuracy can be guaranteed.

The invention relates to a pesticide detection device with an extraction function for agricultural product detection. The pesticide detection device with the extraction function for the agricultural product detection comprises a main body, an extraction mechanism and a disinfection mechanism, wherein the extraction mechanism comprises a rotating sleeve, a supporting sleeve, a bottom plate, a piston block, a first driving assembly, a connecting hole, a filter screen, a sealing assembly and two air cylinders; the disinfection mechanism comprises a second driving assembly, an ultraviolet lamp tube, a connecting ring, a cleaning brush and two supporting plates; and the sealing assembly comprises a cover plate, two sliding rods and two springs. According to the pesticide detection device with the extraction function for the agricultural product detection, a mixture of agricultural products and an extracting solution can be grinded through the extraction mechanism, and then residues of the agricultural products and the extracting solution are separated, the extraction of pesticides in the agricultural products is realized, the detection efficiency of a detector is improved, bacterium onthe agricultural products can be killed through the disinfection mechanism, the impact of the bacterium on the detector is reduced, and the accuracy of the detector is improved.

The invention relates to a hot forming cylindrical workpiece geometrical parameter detection device. The device comprises a tail rod for a bottom thickness test, an LVDT sensor for the bottom thickness test, a bottom thickness test contact and a hole depth test device. The detection method is as follows: a workpiece to be detected is mounted on a main shaft, a positioning cylinder loosens to enable a tail supporting cylinder to act, a rotary pressing head moves forward and presses the workpiece to be detected, the LVDT sensor for the bottom thickness test tests bottom thickness, the main shaft is rotated, an LVDT sensor for a wall thickness difference test tests wall thickness difference, an LVDT sensor for a hole depth test measures the bore diameter of an inner bore of the workpiece, if a measured value is greater than a specified value, the hole depth is judged to be smaller than the specified value, the workpiece is a defective product, and if any value of the bottom thickness, the wall thickness difference and the hole depth is not up to standard, the value is displayed on a display touch screen, and an alarm is given. The detection method adopts clamping for one time, wall thickness difference and bottom thickness numerical values of two or more points are automatically tested, whether the hole depth is up to standard is judged, the automation degree is high, labor intensity is lowered, and detection efficiency is improved.

The invention relates to a loop heat pipe ammonia working medium purity analysis device. The loop heat pipe ammonia working medium purity analysis device is composed of a high-purity carrier gas steel bottle, a first high-purity ammonia steel bottle, a second high-purity ammonia steel bottle, a gasification chamber, a constant-temperature control system, ball valves, a pressure valve, an electromagnetic valve, a re-pressing valve, a check valve, pressure gauges, a flow meter, a vacuumizing set, a waste gas collecting and processing device, a gas chromatograph and a computer. The high-purity carrier gas steel bottle is connected with the gas chromatograph through a carrier gas pipeline. The first high-purity ammonia steel bottle is connected with the gas chromatograph through a purging pipeline, the first ball valve, the electromagnetic valve, the first pressure gauge and the flow meter. The second high-purity ammonia steel bottle is connected with the gasification chamber through a sample inlet pipeline. The vacuumizing set is connected with the gasification chamber through the check valve. The gasification chamber, the vacuumizing set and the gas chromatograph are connected with the waste gas collecting and processing device through discharge pipelines. By means of the integrated design of the device, the detection rate of impurity gas in loop heat pipe liquid ammonia is increased, air inside the pipelines is reduced in the gas sample inlet process, and the measurement accuracy is improved.

The invention discloses a gas analysis and detection device in the environment, which comprises a casing, an air inlet is arranged on the top of the casing, a valve matching the air inlet is arranged on the top of the air inlet, and a filter is arranged above the inside of the casing. The filter screen divides the interior of the shell into a filter chamber and a detection chamber. The top of the filter chamber is located on the side of the air inlet with a suction fan, and the bottom of the filter chamber is provided with a filter mesh. The filter chamber and the detection chamber are detachable. Connection, the bottom of the filter chamber is symmetrically provided with inserts on both sides, and the top of the insert is provided with a stopper. The stopper is located at the bottom of the filter chamber, and the diameter of the stopper is larger than the diameter of the insert. A slot matching the plug is provided at the corresponding position, and an insertion port matching the stop is provided on the top of the slot. Beneficial effects: the filter screen can be cleaned in time conveniently, which is more conducive to the cleanness and tidiness of the gas environment inside the housing, and the detection head can fully contact the gas in the housing, thereby greatly improving the detection accuracy.

The invention relates to a method for measuring a titanium element or titanium dioxide content in a diacetate cellulose tow. In the method, a dynamic colorimetric method is adopted, a continuous flow analyzer is used for detecting, and an external standard method is used for quantifying. The method has the advantages of being simple, fast, high in detection safety, accurate in detection result, small influence of personnel and environment, suitable for multi-batch detection demands of factories, etc.

The invention discloses a human body action recognition method. According to the method, firstly, minimum neighborhood construction and filtering preprocessing are carried out on an image, then imagechannel transformation, target contour enhancement and differential image extraction are carried out, threshold processing and foreground image processing are carried out on a foreground image, and finally model training or action recognition and action positioning are carried out on the basis of a three-dimensional convolutional network. According to the method, the problem that in an existing action recognition method, the detection precision of a model is reduced in a large scene, a small target and a complex background is solved, and meanwhile action detection and action positioning in anycontinuous borderless video stream are realized, the precision of human body motion recognition and the robustness in different application scenes are improved, and the normative application capability of the model is improved.

The invention relates to a monitoring system and method for acquiring coal mine underground dust concentration based on images, and belongs to the technical field of coal mines. The monitoring system comprises a walking track, a detection unit and a control unit, wherein the detection unit and the control unit move along the walking track; a camera, an illuminometer, a hygrometer, a light source set, a data processing unit and a control unit are arranged on the walking track; the data processing unit is connected with the control unit, and the control unit is connected with the camera, the illuminometer, the hygrometer and the light source set; the walking track is composed of two parallel tracks which are arranged along the two sides of the side wall of the roadway respectively; and the camera is installed at the height of a breathing zone of an operator so as to obtain the dust concentration near the breathing zone of the operator. Compared with traditional coal mine underground dust concentration fixed-point monitoring, the monitoring system and the method can obtain coal mine underground particulate matter concentration space distribution, and a foundation is laid for coal mine underground dust concentration global monitoring.

The invention belongs to the technical field of fluorescent detection, and particularly relates to a pulse width modulation-based fluorescent detection and optical-to-digital conversion system. The pulse width modulation-based fluorescent detection and optical-to-digital conversion system comprises an optical current detection circuit, a dark current detection circuit, a reference voltage source, a wireless transmitting module and a wireless receiving end, wherein the wireless receiving end consists of a wireless receiver and an MCU (Micro Controller Unit). Detection of output current of a photodiode is divided into a resetting phase, a heavy current detection phase and a low current detection phase. At the resetting phase, an integrator and a ramp signal generator are reset to initial states. At the heavy current detection phase, reference voltage of a comparator is kept at a fixed level by a reference voltage control signal Sel. At the low current detection phase, the reference voltage of the comparator is controlled to be a ramp signal by the Sel signal. By using the pulse width modulation-based fluorescent detection and optical-to-digital conversion system, conversion from a fluorescent signal to a digital signal at low power consumption and transmission and reception of fluorescent detection data can be realized, and the detection accuracy and the dynamic range of the fluorescent signal by the circuit are improved.