38 results about "Coincidence circuit" patented technology

Misinstallation of a DSA to a semiconductor test instrument and connection failure of a connector are reliably detected and prevented. A semiconductor test instrument comprises a pair of DSAs (10a, 10b) on which socket boards are mounted and a mother board (20) having connectors to which connectors (14) of the socket boards (11) of the DSAs (10a, 10b) are connected. Each of the DSAs (10a, 10b) has an ID setting board for setting an ID number given to each DSA (10a, 10b) and outputting an ID signal representing the ID number, a coincidence circuit for receiving the outputted ID signal and detecting coincidence of the ID signal, a daisy chain circuit for receiving a signal from one of the connectors (21) of the mother board (20), transmitting the signal to all the connectors (21, 14) through the corresponding connectors (14) on the DSA side sequentially, and detecting an output signal.

The invention discloses a channel type radioactive detector with a low detection limit, which is used for a channel type radioactive monitoring system. The channel type radioactive detector comprises a shell, a shielding body arranged in the shell, a plastic scintillator, a first photomultiplier, a first preamplifier, a second photomultiplier, a second preamplifier, a signal processing and controlling unit. Two ends of the plastic scintillator are coupled with two photomultipliers through light guides to output two paths of pulse signals. The signal processing and controlling unit is internally provided with an adder circuit and an accordance circuit, which are used for adding two paths of the pulse signals to detect whether the pulse signals accord with requirements. In the invention, through a signal adding and accordance method and the shielding by using a lead shielding body, the cost can be effectively reduced, the noise is reduced, the signal to noise ratio is improved, the detection efficiency and the sensitivity are improved, and the energy detection lower limit is reduced, so that low-energy nuclides can be more effectively detected and measurement requirements are better met.

There are provided a gamma ray detecting apparatus, including: a secondary electron emitter causing a Compton scattering reaction with an incident gamma ray to emit secondary electrons in a progress direction of the gamma ray; a first radiation detector provided to be opposed to the secondary electron emitter with respect to an emission progress direction of the secondary electrons and detecting the position and transfer energy of the secondary electron; a second radiation detector provided to be opposed to the first radiation detector with respect to the emission progress direction of the secondary electron and detecting the position and the transfer energy of the secondary electron passing through the first radiation detector; a third radiation detector provided to be opposed to the second radiation detector with respect to the emission progress direction of the secondary electron and detecting residual energy of the secondary electron by absorbing the secondary electron passing through the second radiation detector; and a data processor having a coincidence circuit judging whether the secondary electrons simultaneously react in the first to third radiation detectors, and the data processor back traces trajectories of the secondary electrons detected by the first and second radiation detectors to detect the position of a ray source of the gamma ray, and a gamma ray detecting method.

The invention relates to a quick positioning and measuring device for radioactive contamination on human body surface, which comprises a main crystal and a secondary crystal which is sheathed outsidethe main crystal; a light guide, with one end positioned at the end of the main crystal and the secondary crystal and the other end positioned at the end of the photomultiplier tube; a lead shieldinglayer which is sleeved outside the secondary crystal; a photomultiplier tube for converting the weak light signal sent from the light guide into an electrical signal; a magnetic shielding layer sleeved outside the photomultiplier tube; an outer cover is sleeved outside the lead shielding layer and the magnetic shielding layer; a amplifying circuit which is divided into two paths respectively sentto the main channel discriminator circuit and the peak detection circuit, and then accessed into the anti-coincidence circuit; the main crystal signal U2 output by the anti-coincidence circuit and thetotal count signal U1 output by the main channel discrimination circuit are respectively sent to the controller which determines the location of the radioactive contamination by calculation. The invention can rapidly position the radioactive contamination of the human body surface and prevent the interference, and the intelligent multi-function radioactive contamination instrument can be linked quickly and intelligently to realize quick elimination and improve the decontamination efficiency.

The invention discloses a gamma ray time measurement device and a method for manufacturing the detector thereof. The device comprises: a detector, a timing discrimination circuit, an amplification and shaping circuit, a single-channel pulse analyzer, a delay circuit, a time-amplitude conversion circuit, and a coincidence circuit and multi-channel analyzers. The present invention uses BaF2 crystal, POPOP, and silicone rubber as materials to make a composite scintillator with a special process, and process it into a honeycomb shape to form a detector, which can convert the fluorescence of 220nm wavelength emitted by BaF2 crystal into visible light with a wavelength of about 420nm, without A photomultiplier tube with a quartz window is needed, which greatly expands its application range; the structural design of the honeycomb shape increases the surface area of ​​the scintillator, so that part of the scintillation light can propagate in the air medium and reach the photodetector after refraction. The time of the photodetection device is shortened, so that the initial stage of the signal rises faster, which is beneficial to the timing of the timing discriminator, thereby improving the timing accuracy of the gamma ray time measuring device.

The invention discloses an over current detector, which adopts a first reverse gate and a second reverse gate; reverses a first digital signal and a second digital signal; adopts a compensation gold oxygen semiconductor crystal to receive the reversed signals and drive a load; when the current of the load is over, adopts a comparison circuit to detect the over current on the load to be compared with the reversed first and second digital signals; outputs a first electronic signal and a second electric signal to a first logic gate and a second logic gate; and provides the output signals of the logic gates to a protection circuit to control the current on the load, thereby preventing the whole circuit from being burnt and accident. The over current detector can detect over current accuratelyand effectively, and can be integrated with compensation gold oxygen semiconductor crystals, to save electricity and reduce circuit volume.

An electronic component footprint setup system in collaboration with a circuit layout system and a method thereof are provided in the present disclosure. The electronic component footprint setup system in collaboration with a circuit layout system provides a user operating the circuit layout system with an interface on which parameters of an electronic component footprint to be created are configured; the parameters of the electronic component footprint are transformed for conforming to electronic component footprint specifications used in the circuit layout system; characteristic values of the electronic component footprint are calculated according to electronic component footprint specifications and electronic component footprint setup regulations; the electronic component footprint is created in the circuit layout system according to the characteristic values.

The invention discloses an absolute measuring system and a method for radon concentration in water, wherein the measuring system comprises a first [gamma] detector, a first linear amplifier, a first single channel pulse amplitude analyzer, a first delay formation circuit, a first scalar connected in series, and a second [gamma] detector, a second linear amplifier, a second single channel pulse amplitude analyzer, a second delay formation circuit, a second scalar connected in series. The outputs of the first delay formation circuit and the second delay formation circuit are also connected to the input of a coincidence circuit, and the coincidence output of the coincidence circuit is connected to a third scalar. The measuring system also comprises a calculation module for calculating the activity concentration C222Rn of 222Rn in the sample to be tested. According to the absolute measuring system and the method for radon concentration in water, the radon concentration in the water can bemeasured accurately, in real time and conveniently without the need to scale the measuring system itself.