49results about How to "Avoid detection bias" patented technology

The invention discloses a multi-angle dynamic light scattering particle size distribution measuring device and method. The device comprises a laser device, a colorimetric dish, a rotary displacement table, a receiving module, a photon counter and a computing and processing module, wherein the colorimetric dish is used for containing nano-particle suspension liquid to be measured, the rotary displacement table is provided with an outer disc and an inner disc, the receiving module is located on the outer disc, rotates around the rotating axis with the outer disc and is used for receiving light scattered by the nano-particle suspension liquid to be measured at different angles, the photon counter is used for recording the information about the time-variable light intensity of the scattered light received by the receiving module at different angles, and the computing and processing module is used for computing the particle size distribution of nano-particles in the nano-particle suspension liquid to be measured according to the received scattered light and recorded time-variable light intensity information. The detecting deviation problem existing when different-angle dynamic light scattering information is detected by using multiple detectors is avoided, and the multi-angle dynamic light scattering particle size distribution measuring device is good in stability and high in measuring accuracy.

The invention discloses a method for calculating the position and the movement velocity of a vacuum switch contact. The method comprises the following steps of an image acquisition step of acquiring a continuous image of the movement of the vacuum switch contact and an arc; an edge analysis step of analyzing each frame in the continuous image, acquiring the upper edge position and the lower edge position, of the arc in each frame, which are respectively the position of a vacuum switch static contact and the position of a moving contact in the present frame; and a velocity calculating step of calculating the displacement of the moving contact in two adjacent arc motion frames, and calculating the ratio, of the displacement to the frame difference time, which is the movement velocity of the moving contact. Due to the fact that an image analysis technology is employed, when the method provided by the invention is compared with a present method for calculating the position and the movement velocity of a vacuum contact, the precision is greatly improved; and at the same time the employed technology is mature and reliable, and the method is suitable for large-scale popularization and usage.

The invention discloses a system for measuring a three-dimensional volume scattering function of a microparticles in water. The system comprises a parabolic spherical reflector, a sample pool, a telescope group, a photoelectric detector and a computing processing unit, wherein the sample pool is arranged in a reflector cavity of the parabolic spherical reflector, the center position of the sample pool is located in a parabolic spherical focal point of the reflector cavity of the parabolic spherical reflector, incident light is converged at the reflector cavity focal point position, incident to a parabolic spherical surface after being subjected to particle scattering in the sample pool, transformed into parallel scattered light, received by the photoelectric detector after passing through the telescope group, and transmitted to the computing processing unit for processing, and thus, the three-dimensional volume scattering function of the microparticle can be obtained. The invention further discloses a method for measurement by utilizing the system. According to the invention, the problem of detection deviation generated when a plurality of detectors are used for detecting the volume scattering functions of different angles is avoided, the acquired image is good in uniqueness and high in contrast ratio and can be completely fixed in a work process, and the measuring stability is good and the measuring speed is high.

The invention discloses an air conditioner and a control method and device of the air conditioner. The control method comprises the steps that first detecting data of an air conditioner humidity sensor when a fan is shut down is obtained, wherein the first detecting data comprises a first temperature and a first moisture content of the located environment at the moment that the fan is shut down; the first detecting data is used for correcting a relative humidity detected by the humidity sensor actually at the current time; and the air conditioner is controlled to operate according to the corrected relative humidity. According to the air conditioner and the control method and device of the air conditioner, the control method solves the problem of detection deviation of the humidity sensor due to refrigerating or heating shutting-down and influences of waste coldness and waste heat of an evaporator, the humidity detection is enabled to be closer to an actual value of the environment, automatic dehumidification and humidification functions of the air conditioner can operate normally, and the usage experience of users is effectively improved.

The invention provides an air conditioner refrigerant leakage detection method and an air conditioner. A refrigerant loop is involved in the air conditioner refrigerant leakage detection method, a detectable additive is added in the refrigerant loop, a detection device is arranged outside the refrigerant loop, the detection device is used for detecting the concentration of the part, outside the refrigerant loop, of the additive in the refrigerant loop and feeding the concentration back to a controller, and the controller runs the corresponding control program according to a detection result and the pre-storage relationship. According to the air conditioner refrigerant leakage detection method, the situation that when a refrigerant is leaked, a compressor with leakage situation is directlystarted during starting of the air conditioner, and then further damage is caused to the air conditioner is avoided, then the detection deviation caused by other external factors is avoided, a multi-stage different-state same-element difference value comparison method is adopted, meanwhile, the detection factors are corrected, so that misjudgment is reduced, the accuracy of refrigerant leakage detection is improved, and the comfort of the user experience is improved.

The invention discloses a simplified algorithm of synchronous frequency conversion soft starting motor rotor position detection. According to the simplified algorithm, motor stator three-phase voltage waveforms at different rotation speeds are collected through a voltage hall circuit and an analog sampling circuit and are compared synchronously, and the position of a motor rotator is judged. An appropriate contravariant pulse is given according to the judged real-time rotor position to enable a corresponding thyristor to be opened, and a motor rotates in the process of starting. By means of the simplified algorithm, a rotator position detecting device does not need to be connected to the outer side of the motor, the processes of field installation and debugging of equipment are greatly simplified, the occurrence that different rotor position detecting devices need to be additionally arranged for different devices is avoided, and therefore complex external connection and maintaining cost can be reduced. The simplified algorithm is simple, practical and easy to achieve, not affected by different parameters such as motor manufacturers, types and power and suitable for synchronous frequency conversion soft starting devices of different motors.

The invention discloses a bone age testing method based on a machine learning model, a device, computer equipment and a storage medium, wherein the method, the device, the computer equipment and the storage medium belong to the field of machine learning technology. The bone age testing method based on the machine learning model comprises the steps of receiving a to-be-tested X-ray film which comprises a bone image; identifying the attributes of multiple predetermined parts of the bone from the bone image of the X-ray film for forming a first attribute set; inputting the first attribute set into the first machine learning model for outputting a first bone age; matching the bone image in the X-ray film with the standard image of the human bone with each bone age, and finding out the bone ageof the human bone which matches the bone image in the X-ray film as a second bone age; performing scoring on the attribute of each predetermined part in the first attribute set, obtaining a total score according to the score of the attribute of each predetermined part, and outputting a third bone age according to the total score; and outputting the weighted summation of the first bone age, the second bone age and the third bone age as the tested bone age. The bone age testing method prevents a testing deviation caused by a single bone age algorithm.

The invention discloses a point circle average diameter detecting mechanism of an internal-tooth-shaped workpiece. The mechanism comprises four sets of identical detecting assemblies that are arrangedaround one same central line, wherein an included angle between every two adjacent sets of detecting assemblies is 90 degrees. Each set of detecting assemblies includes a guiding block with a guidingslot extending in a radial direction of the circumference, a sliding block including a main body part matching the guiding slot, a detecting arm installed at the main body part, a limiting block fixedly connected to the guiding lock, a cylinder for driving the sliding block to slide along the guiding slot, and a displacement sensor. When the sliding block slides to a limit position outwardly, thedetecting arm is abutted against and contact with the limit block. The displacement sensor includes a spring arranged in a shell and a detecting shaft extending from the shell; one end of the detecting shaft is abutted against the spring and the other end is abutted against the outer side of the sliding block to detect radial displacement of the sliding block. With the detecting mechanism, the point circle average diameter of the internal-tooth-shaped workpiece can be detected accurately.

The invention discloses time-resolved optical biological detection equipment based on broadband stimulated radiation and a detection imaging method thereof. A pumping detection technology is combinedwith an optical coherence microscopy technology to realize stimulated radiation life imaging of a detected sample. The equipment comprises a super-continuum spectrum light source, a light modulation unit and an optical coherence microscopy unit, wherein the light modulation unit modulates input laser to generate pump light and probe light with time delay, the optical coherence microscopy unit is used for carrying out coherence detection on a biological sample, and the system analyzes a relation curve of signal intensity and time delay by using a phase vector method to obtain life-related information. The equipment can reflect a finer structure of an atomic energy level, has the advantages of long working distance, high temporal-spatial resolution, rapid imaging and the like, and has both tissue structure information and molecular specificity information. In addition, detection of non-fluorescence chromophores can be achieved, and detection deviation possibly caused by fluorescence labeling under specific conditions is avoided.

The invention provides a multiple-step shaft end face run-out detecting gauge. The multiple-step shaft end face run-out detecting gauge can simple, conveniently and quickly detect multiple-step shaft end face run-out, is high in detecting efficiency, further avoids detection deviation, and ensures the detecting and processing quality of the multiple-step shaft end face. The multiple-step shaft end face run-out detecting gauge comprises a detecting module and is characterized in that a detecting cavity corresponding to a multiple-step shaft is arranged in the detecting module, and a plurality of detecting head respectively corresponding to the step end faces are arranged on the detecting module corresponding to the detecting cavity.

The invention discloses a fixed connecting sleeve for measuring pipes of a pile foundation, and relates to the technical field of municipal infrastructure construction. The fixed connecting sleeve forthe measuring pipes of the pile foundation comprises sleeve pipes. The number of the sleeve pipe sis at least three, and every two adjacent sleeve pipes are connected through a sleeve pipe connectingrod. Fixed rods are fixedly connected to each sleeve pipe connecting rod. Each sleeve pipe comprises a pipe body and a sound measuring pipe. Sawteeth arranged in a cooperation manner are arranged onthe pipe bodies and the sound measuring pipes. According to the fixed connecting sleeve for the measuring pipes of the pile foundation, through sleeve pipe improvement and cooperative use of the sleeve pipe connecting rods and the fixed rods, the relative positions of the sound measuring pipes are guaranteed well, the situation that the sound measuring pipes are blocked due to infirm connecting ofthe multiple segments of sound measuring pipes is avoided, meanwhile, the situation that deviation happens to detection due to shifting of the sound measuring pipes is avoided, engineering quality isimproved, and meanwhile the repair frequency is reduced.

The invention discloses a safety detection and alarm device and method for children left in an automobile. The safety detection and alarm device comprises a processor, a human body infrared sensor, a temperature sensor, a sound sensor, an alarm and a wireless transmission module. The processor, the human body infrared sensor, the temperature sensor, the sound sensor and the wireless transmission module are arranged in the automobile, the human body infrared sensor, the temperature sensor and the sound sensor are all connected with the processor, the processor is connected with an ignition switch and a vehicle door closing detection unit, and the output end of the processor is connected with the input end of the wireless transmission module; the alarm is arranged outside the automobile, the input end of the alarm is connected with the output end of the processor, children and temperature in the vehicle are detected in multiple directions, the detection accuracy is improved, and an alarm can be generated in time to remind an automobile owner.

The invention discloses an immunoturbidimetry detection reagent and a preparation method thereof. The reagent comprises latex microspheres, a buffer solution, [epsilon]-polylysine, an activating agentand a preservative, wherein the activating agent is prepared from N-hydroxyl succinimide and 1-(3-dimethylaminopropyl)-3-ethyl carbodiimide hydrochloride, and the pH value of the activating agent is7 to 9. The concentration of the activating agent is 50-300mg/ml, the pH value of the buffer solution is 6.0-8.0, the molar mass of the buffer solution is 20-100mM, and the mass percent of the preservative is 0.05-0.2%. According to theimmunoturbidimetry detection reagent,by optimizing the components and proportion of the reagent and treating the latex microspheres before coupling, the sensitivityof the latex microspheres is improved, and the absorbance of some detection items at a low value is improved, so that the detection deviation caused by the fact that the real condition of a sample cannot be accurately reflected when the low value is tested is avoided, and the detection accuracy is improved.

The invention provides a zero-position adaptive device and method for an electrochemical sensor. The device comprises an air-inlet module, a check valve, an air pump, an electrochemical sensor module,a power supply module, a core processing module and a discharging module, the air-inlet module is separately connected with the air pump and the electrochemical sensor module, the check valve is arranged between the air-inlet module and the air pump, the air pump is separately connected with the electrochemical sensor module, the core processing module and the power supply module, the electrochemical sensor module is separately connected with the core processing module, the power supply module and the discharging module, and the power supply module is also connected with the core processing module. According to the zero-position adaptive device and method for the electrochemical sensor, once zero-position drift occurs in a usage process of the sensor, adaptive calibration can be rapidly realized, and zero-position deviation is avoided.