12 results about "Counting efficiency" patented technology

The embodiment of the invention relates to the technical field of nuclear detection and measurement, and discloses a double-label nuclide analysis method and device and a program product, and the method comprises the steps: measuring a standard quenching source, and obtaining an external standard source spectrum index of the standard quenching source; drawing a correction curve by taking the external standard source spectrum index as an independent variable; measuring the double-labeled sample under external gamma source high voltage, and obtaining and calculating an external standard source spectrum index of the double-labeled sample through external gamma source spectrum stripping; determining the counting efficiency of low-energy nuclide, the counting efficiency of high-energy nuclide, the spectrum index of the low-energy nuclide sample and the spectrum index value of the high-energy nuclide sample corresponding to the double-labeled sample under the current quenching level according to the external standard source spectrum index of the double-labeled sample and the correction curve; the method comprises the following steps: measuring a double-labeled sample under double-labeled high pressure to obtain a full-spectrum counting rate and a full-spectrum sample spectrum index of the double-labeled sample; the low-energy nuclide activity and the high-energy nuclide activity of the double-labeled sample are calculated based on the parameters, so that the operability is higher, the accuracy is higher, and the application range is wider.

The application discloses a time-to-digital conversion device, a time-correlated single photon counting system and a time-to-digital conversion method. The time-to-digital conversion method generates a gate pulse signal by using an FPGA according to a period, the gate pulse signal has a pulse width of a half period and has a starting edge and an ending edge; an ASIC is used to generate a fine time value of an event according to the gate pulse signal; the FPGA receives the fine time value, counts the starting edge to generate a coarse time value when the fine time value is less than the half period value, counts the ending edge to generate the coarse time value when the fine time value is greater than or equal to the half period value, and then the FPGA combines the coarse time value and the fine time value to generate a time value; the time-to-digital conversion device realizes the above method, and the time-correlated single photon counting system uses the above time-to-digital conversion device. The above technical scheme can avoid the problem of low counting efficiency caused by too many bits of the coarse time value of the ASIC when the measurement range is too long, and can also take advantage of high precision, uniform bin width and good temperature stability of the ASIC.

The invention relates to self-weight sliding type automatic ball counting equipment which is a small spherical product counting device based on optical fiber sensor detection. Comprising a blanking and shunting part, a counting part and a counting and collecting part, the blanking shunting part, the counting part and the post-counting collecting part are connected in a step shape which is reduced in sequence; the discharging and distributing part is used for uniformly distributing the concentrated balls at the high-position end into a plurality of parallel discharging channels and enabling the balls in the discharging channels to roll to the position of a discharging port at the low end under the action of gravity; the counting part is used for receiving the balls output from the discharging and distributing part at the upper end, completing material separation and accurate counting in sequence in the process that the balls move downwards along the inclined face, and outputting the balls through the lower end. And the post-counting collecting part is used for receiving the counted balls and realizing temporary storage. The counting device has the advantages of being high in counting response speed, high in counting precision, high in counting efficiency, good in applicability and high in automation degree.

A particle counter comprises; a horizontal inlet 1 for carrier gas / aerosol flow; a heated mixer chamber 2 where gas saturated with a working fluid vapour is added to the aerosol; a horizontal cooled c

The utility model discloses a counting device, which comprises a base, a counting assembly and a plurality of movable plates, the plurality of movable plates are detachably arranged on the base, each movable plate comprises a first side surface, the first side surface is provided with a plurality of limiting parts along the height direction of the movable plate, and the plurality of limiting parts are arranged at intervals; the multiple movable plates are arranged in pairs in pairs, the first side faces of the movable plates in pairs are oppositely arranged so that the limiting parts of the movable plates in pairs can form a counting station used for containing workpieces, and the counting assembly is arranged on the movable plates and used for counting when it is detected that the workpieces are placed in the counting station. According to the counting device, the limiting parts of the movable plates in pairs are oppositely arranged, then the counting station for placing the workpieces is jointly formed, and when the workpieces are placed in the counting station, the counting assembly completes counting of the workpieces, so that the counting efficiency is improved, the problems that manual counting is prone to making mistakes and high in cost are solved, and the working efficiency is improved. And the overall cycle of workpiece turnover is shortened.

The application discloses a particle counting system and method, a first optical sensor is arranged on the side of a measuring light beam for receiving a particle scattering light signal in an air flow; a second optical sensor is used for detecting a light intensity signal of a light beam of a light source; a light beam control board adjusts the output power of the light source according to the light intensity signal detected by the second optical sensor, so that the light intensity of the light beam is constant; an air flow speed detection assembly detects the air flow speed flowing through a light chamber; a main control board adjusts the air flow speed according to the feedback data of the air flow speed detection assembly, so that the air flow speed is constant, or the particle scattering light intensity is corrected in real time according to the air flow speed; a high-speed data acquisition and processing module acquires an electric signal corresponding to the particle scattering light in real time and detects a signal baseline in real time, and the absolute intensity of the particle scattering light is obtained according to the difference between the particle pulse height and the baseline, and the particle size is distinguished based on the absolute intensity, so as to eliminate the particle size discrimination error caused by the baseline fluctuation. The scheme can guarantee the stability of 50% counting efficiency.

The invention discloses a double-station tank cover counter which comprises a base, a mounting frame is arranged at the upper end of the base, a mounting plate is placed in the middle of the top wall of the mounting frame, a guide ring is arranged at the front end of the mounting plate, a positioning plate is arranged in the middle of the upper end of the mounting frame, an infrared counter is arranged at the front end of the positioning plate, and the double-station tank cover counter further comprises a fixing mechanism and a bearing mechanism. The fixing mechanism comprises vertical rods and a top plate, the vertical rods are arranged on the left side and the right side of the top wall of the mounting frame correspondingly, baffles are arranged at the lower ends of the vertical rods correspondingly, the vertical rods are slidably connected with sliding holes correspondingly formed in the lower end of the top plate correspondingly, and the upper end of the top plate makes contact with the lower end of the mounting plate. A traditional mode that the guide ring is installed and fixed through bolt body connection is replaced, the problem that the stability of the counting tray is reduced due to the fact that hydraulic oil of the hydraulic rod is affected by temperature and humidity is solved, and the counting efficiency is further improved.

The utility model relates to a particle counter, which comprises a scattering cavity, a light source cavity, an air inlet pipe, an air outlet pipe, a reflecting mirror, a photodiode, a light filtering hole, a light trap and the like. A laser in the light source cavity shapes laser beams through an aspherical lens and a cylindrical lens, and the laser beams are scattered with gas particles through the scattering cavity. The vertical scattered light is reflected to the photodiode by the reflector, is converted into an electric signal, is amplified, is collected to a computer through a collection card, and is processed and counted through an upper computer program. The filter hole and the light trap absorb stray light, and noise interference is reduced. The air inlet pipe adopts a sheath flow device structure, particle beam width is reduced, and counting precision is improved. The photoelectric detector adopts a high-sensitivity photodiode, and meanwhile collection and detection of scattered light are optimized. And an upper computer program judges the corresponding particle size by screening and comparing the voltage amplitudes and performs counting, so that the counting efficiency and the counting precision are improved. Corrosion-resistant materials are designed and selected, a dustproof and moistureproof structure is added, and durability and stability of equipment are ensured. The particle counter is suitable for the fields of laboratories, industrial sites and medical treatment and public health, has the advantages of miniaturization, portability, low cost, easiness in maintenance and the like, can monitor the concentration of particulate matters in the environment in real time, and ensures the cleanliness of production and medical treatment and public health environments. Through a counting system of an upper computer program and an optimized optical and gas circuit structure, the detection efficiency and precision are remarkably improved, and wide application prospects are achieved.

The invention discloses an SVM (Support Vector Machine)-based liquid flash spectrometer alpha and beta discrimination method, which comprises the following steps of: respectively carrying out liquid flash determination by utilizing standard solution samples of two nuclides with known activity to obtain pulse signals corresponding to the two nuclides; taking the pulse width and the rise time of the pulse signal as two-dimensional characteristic values, and standardizing the two-dimensional characteristic values to form a standardized data set; establishing an SVM (Support Vector Machine) model, and training by using the standardized data set to obtain an alpha-beta prediction model; obtaining the nuclide counting efficiency of the standard source A and the nuclide counting efficiency of the standard source B; the nuclide activity of the to-be-detected sample A and the nuclide activity of the to-be-detected sample B are obtained. According to the method, low-dimensional nonlinear data is implicitly mapped to a high-dimensional space through a Gaussian kernel technique to realize linear separability, explicit processing of a binary feature classification problem such as high-dimensional calculation and adaptive alpha / beta discrimination is not needed, pulse width abnormal value interference can be reduced, and meanwhile, through a large amount of training set data learning, a high-dimensional feature classification problem is solved. The misjudgment possibility is greatly reduced, and the discrimination precision is improved.

A particle counter comprises; a horizontal inlet 1 for carrier gas / aerosol flow; a heated mixer chamber 2 where gas saturated with a working fluid vapour is added to the aerosol; a horizontal cooled c

The invention provides a counting method, a counter and a computer readable storage medium. The counting method is used for counting according to a point cloud of a laser radar, and comprises the steps: obtaining the point cloud collected by the laser radar; determining the distance between the target object and the laser radar according to the point cloud; determining the point number of the target object in the point cloud; and outputting the point number of the target object under the distance. According to the counting method disclosed by the invention, the point number of the target object under the distance can be automatically output, and the counting efficiency and the reliability of the counting result can be improved.