8 results about "Detector" patented technology

An instantaneous frequency measurement system based on a differential optical time stretching principle relates to the field of microwave photonics, ultrafast measurement and real-time measurement, and is characterized in that a light output end of a pulse laser light source is connected with one end of a dispersion module I, the other end of the dispersion module I is connected with an input end of a polarization controller, and an output end of the polarization controller is connected with a light input end of a modulator; one output port of the modulator is connected with the input end of the optical circulator I; the other output port of the modulator is connected with the input end of the optical circulator I, the other output port of the modulator is connected with the input end of the optical circulator II, the port of the optical circulator I and the port of the optical circulator II are respectively connected with one end of the dispersion module II, and the port of the optical circulator I and the port of the optical circulator II are respectively connected with the first optical input port and the second optical input port of the balance detector. The system can relieve the pressure of rear-end electronic equipment, eliminates the distortion influence of uneven laser pulse envelope on measurement through differential detection, and can perform real-time and accurate ultrafast measurement on multi-frequency signals.

The invention provides a torsional spring driven shear-hinge ring rib type deployable antenna mechanism, which comprises radial deployable units and circumferential deployable units, each radial deployable unit comprises an inner faceplate, a first shear-fork rod, a second shear-fork rod, a third shear-fork rod and an outer faceplate, and the radial deployable units are arranged on the outer side of the inner faceplate in a circumferential array manner; the radial deployable units are connected with the circumferential deployable units through the outer disc chucks, the circumferential deployable units are sequentially connected end to end through the outer disc chucks, each circumferential deployable unit comprises a folding rod and a torsional spring driving assembly, and the folding rods are connected through the torsional spring driving assemblies. By adjusting the number of the radial deployable units and the circumferential deployable units and the lengths of the scissor rods and the folding rods forming the units, the deployable antenna mechanism with any caliber is formed, and the deployable antenna mechanism has the advantages of being good in manufacturability, high in rigidity, large in folding ratio and the like; the problems that an existing deployable antenna is complex in mechanism, low in reliability, poor in rigidity and strength and the like are solved, and the antenna can be better applied to communication satellites, space stations and space detectors.

The invention relates to the field of optical detection equipment, in particular to multiband beacon optical detection equipment. The detection equipment comprises a signal light channel, a fine aiming mirror arranged in the signal light channel, a first beam splitter, a second beam splitter, a first detection device, a second detection device and a communication assembly, capturing and tracking of wide-beam signal light are achieved through a first detection device, and after being reflected by a fine aiming mirror, a first light splitting piece and a first light filter, an externally-transmitted beacon light beam is focused to a first detector through a first lens set to be imaged; narrow-beam signal light is captured and tracked through a second detection device, and an external signal light beam is reflected by a fine aiming mirror, transmitted by a first light splitting piece and transmitted by a second light splitting piece and then is focused to a second detector through a third lens group to be imaged. And capturing and tracking of multi-band signal light are realized. When the narrow-beam signal light is captured and tracked, a wide-beam signal light path of a transmitting end and a detection receiving end path are closed, so that the power consumption is effectively reduced.

The invention discloses a gas chromatograph FID (Flame Ionization Detector) detection circuit, which belongs to the technical field of gas chromatographs and comprises a signal amplification unit, a zero-crossing comparison unit and an ADC (Analog to Digital Converter) sampling unit, the signal amplification unit is used for receiving the flame electric signal, amplifying the flame electric signal and outputting the flame electric signal to the zero-crossing comparison unit; the zero-crossing comparison unit is used for receiving and comparing the amplified flame electric signals and outputting the flame electric signals to the ADC sampling unit; and the ADC sampling unit is used for receiving and collecting the compared signals and outputting the signals to the single chip microcomputer. According to the detection circuit provided by the invention, the hydrogen flame ionization detector can detect wide-range weak current 10 <-14 >-10 <-9 > A, noise can be reduced, amplification and detection of tiny signals are realized, and the precision and sensitivity of the detector are improved. The gas chromatograph detector can be widely applied to gas chromatograph equipment, and the precision and the stability of data acquired by a portable gas chromatograph are improved compared with those of a conventional detector.

There is provided an abnormality detection device and a fixing structure which are suitable for detecting an abnormality of a fastener such as a bolt or a nut. An abnormality detection device detects an abnormality of a fixing structure including a bolt, a nut, and a washer which include a conductor and fix steel plates to each other, and a spacer which includes an insulator and is disposed between the steel plates and the washer, the abnormality detection device including: a transmission antenna that radiates electromagnetic waves to the fixing structure; a reception antenna that receives electromagnetic waves reflected by the fixing structure; and an abnormality detector that changes a frequency of the electromagnetic waves radiated from the transmission antenna to acquire frequency characteristics of standing waves received by the reception antenna and detects an abnormality of the fixing structure by comparing the frequency characteristics with frequency characteristics in a normal state.

The invention relates to a substation bus joint discharge heating fault monitoring system, which belongs to the technical field of power system line monitoring. The system comprises a detector arranged at a substation bus joint node, a communication terminal connected with the detector and a remote terminal connected with the detector through the communication terminal. The detector is used for detecting discharge overheating data of a bus joint node, the communication terminal is used for realizing discharge overheating data processing, data analysis and wireless communication functions of a bus joint, and the remote terminal obtains signal parameters through analysis and calculation. The obtained parameters and actual values and initial values of the physicochemical property parameters of the substation bus joint are taken as training samples, the samples are trained by utilizing IGWO-RBFN, the dimensionality of a data set is reduced, the function of the data set is kept, and a detection model of the physicochemical property parameters of the substation bus joint is established; and the detection model is used for analyzing data obtained through detection each time, fault positioning and remote monitoring are achieved, and an instruction is sent out.