279 results about "Light barrier" patented technology

Various wearable health monitoring devices are described herein. Some implementations include one or more emitter chamber covers injection molded out of a first material comprising transparent glass, one or more detector chamber covers injection molded out of a second material comprising transparent glass, and a light barrier construct injection molded out of a third material over the one or more emitter chamber covers and the one or more detector chamber covers. The third material may be opaque and can comprise glass and an optically absorbing pigment. Some implementations include a circuit board, emitter(s) mounted to the circuit board and arranged within the emitter chamber cover(s), and detector(s) mounted to the circuit board and arranged within the detector chamber cover(s). The circuit board, emitter(s), detector(s), emitter chamber cover(s), and detector chamber cover(s) can form part of a sensor assembly connected to a housing of the wearable health monitoring devices.

The utility model discloses a three-color micro-projection optical system, the three-color micro-projection optical system is provided with an object side and an image side which are correspondingly arranged along an optical axis direction, the three-color micro-projection optical system comprises a diaphragm, a lens group and a color combination prism assembly which are sequentially arranged from the object side to the image side; the color combination prism assembly comprises a color combination prism, a red light-emitting chip, a green light-emitting chip and a blue light-emitting chip; the focal length of the three-color micro projection optical system is f, 5.9 mlt; flt; the thickness is 6.4 mm; the distance from the diaphragm to the image surface is the total optical length TTL and TTLlt of the three-color micro-projection optical system; and the thickness is 10.2 mm. By means of the arrangement, in the environment temperature range of 20-60 DEG C, the optical system does not defocus during working, the MTF full frequency is higher than 0.5, the total length of the optical system can be controlled within 10.2 mm, and the working performance is more stable.

The invention relates to the technical field of stator and rotor gap measurement, in particular to a generator stator and rotor gap laser measuring device which comprises a detection bottom frame, a laser head and a laser receiver, two clamping structures capable of providing rotating force are installed on the upper side of the detection bottom frame, and a fixing ring is arranged on the upper side of the detection bottom frame. A power control structure for controlling the fixed ring to move vertically and transversely is mounted on the detection bottom frame, and a rotating ring is coaxially and rotationally inserted into the inner ring side of the fixed ring. The device can stop rolling through the same roller, the elastic connection between the friction ring and the long rod drives the light barrier to shield the laser emitted by the laser head, the laser receiver can only receive the laser fluctuation change when the same roller is in contact with the stator and the rotor, and one notch supporting plate supports the stator and the rotor which are just separated from each other. And the other notch supporting plate is in contact with the next stator and rotor structure, and the roller cannot be clamped in a gap between the stator structures or a gap between the rotor structures.

The invention discloses a confocal alignment device and method for correlation beams of double-beam optical tweezers, and belongs to the technical field of optical tweezers. A laser light source of the device is subjected to beam expansion, then passes through a linear polarizer for polarization and a # imgabs0 # wave plate, and then enters a polarization splitting prism for beam splitting; reflected light S of the polarization splitting prism enters a first objective lens after being reflected by a first reflector and a first dichroscope, and emergent light P enters a second objective lens after being reflected by a second dichroscope; the second reflecting mirror is arranged in an S light path passing through the second dichroscope; the plano-convex lens is arranged in front of the imaging camera and is coaxial with the imaging camera; an imaging sheet fixed on the single-axis displacement platform can be moved in and out in a light path; according to the method, an imaging sheet is moved out or introduced between objective lenses which are coaxially mounted, and a light blocking sheet is moved out and introduced in an S light path, so that respective imaging of two beams of light can be realized, the radial space center position of a correlation light beam can be directly observed, and the alignment adjustment efficiency of the light trap is improved.

The invention discloses a PCB (Printed Circuit Board) capable of directly installing a double-optical-path optical axis, the double-optical-path optical axis and a keyboard, the PCB is provided with a plurality of slotted holes, the PCB is fixed with the double-optical-path optical axis through the slotted holes, each double-optical-path optical axis is correspondingly provided with a chip and a photosensitive element, and the chip is one of a full-color control chip, a color control chip, a load color control chip, a fantasy color control chip and a full-load color control chip. The double-light-path optical axis comprises a bottom shell, a spring, an upper cover, a pressing handle with a light barrier, a double-light-path light guide body and a receiving light guide body. The four chips serve as emitting light sources of the double-light-path light guide body, one chip provides an emitting light source for the light switch, the other chip provides light source for the key cap character illumination and the light sensitive element receives the emitting light source of the light switch, meanwhile, the double-light-path optical axis is directly installed on the PCB, a special shaft body fixing plate is omitted, the material cost and the assembly cost are reduced, and the keyboard height is also reduced. The assembly error between the original shaft and the PCB is naturally eliminated, and the stability and the reliability of the keyboard function are improved.

The utility model relates to the technical field of laser processing, in particular to a wafer purging device and a wafer purging system. The wafer blowing device comprises a light barrier, a plurality of shielding gas blowing mechanisms and a plurality of gas blowing mechanisms, and the plurality of shielding gas blowing mechanisms and the plurality of gas blowing mechanisms are arranged by taking the laser outlet as a geometric center. According to the wafer blowing device and the wafer blowing system provided by the utility model, pressurized gas is blown to the surface of the wafer through the gas blowing mechanism, so that the tightness of the wafer is improved; the shielding gas is blown to the surface of the wafer through the shielding gas blowing mechanism, so that the surface of the wafer is covered with the shielding gas, and the oxygen content concentration of the machining area is reduced; besides, in the arrangement mode with the laser outlet as the geometric center, the shielding gas can form a gas curtain around the center of a light spot, the shielding gas can be blown outwards along the surface of the wafer, a micro-positive pressure environment is formed on the surface of the wafer, most external environment air can be prevented from entering a laser machining area, and it is guaranteed that the oxygen content meets the requirement of the machining technology.

The present invention provides a visual indicator film for the freshness of fresh-cut fruits, a preparation method, the use and a detection method. The preparation method comprises the following steps: preparing a Co-based MOF; washing and activating the Co-MOF; preparing a CMC-Na-based thin film; and preparing a CMC-Na-based thin film, and thereby obtaining an indicator film for phenol red (PR) or an indicator film for bromothymol blue (BTB). In the present invention, an irregular spherical Co-based metal organic framework (Co-MOF) loaded with PR or BTB is prepared, and the nanocomposites Co-MOF / PR and Co-MOF / BTB are obtained after dyes and the MOF are adsorbed by means of the hydrogen bond interaction. Then, the nanocomposites are embedded into a sodium carboxymethyl cellulose (CMC-Na) base material to prepare CO2-responsive packaging materials, namely, a CMC-Na / PR / Co-MOF and a CMC-Na / BTB / Co-MOF, which are used for monitoring the freshness of fruits in real time and in situ. The Co-MOF-based composite thin film has good water resistance, time-temperature stability and mechanical properties, and also exhibits enhanced ultraviolet-visible light barrier properties, dye migration resistance and thermal stability. The visual indicator film for the freshness of fresh-cut fruits can effectively reflect the concentration of CO2, and is suitable for real-time and in-situ monitoring of the freshness of fruits.

The invention relates to a mobile laser scanning microscope (100) comprising: a chassis (10) with rollers (12), an optical table (30) connected to the chassis (10) via a vibration damper (20), an upper optical box (40) containing a scanning head (42) with acousto-optical deflectors, a pillar (60) connecting the upper optical box (40) to the optical table (30) and holding it at a distance above therefrom, a stage (31) arranged on the optical table (30), a microscope module (32) arranged above the stage (31) and comprising a microscope objective (33) optically coupled to the scanning head (42) and at least one detector (75a, 75b), at least one laser (35) arranged on the optical table (30), an optical beam path (36) guiding a beam of the at least one laser (35) from the at least one laser (35) through the upper optical box (40) to the objective (33), compartments (17) connected to the chassis (10) below the optical table (30) and housing power supplies (15) and control systems (16) of the microscope (100), and a light barrier system (50) having a cover (52) covering units arranged on the optical table (30).

This invention relates to a light-blocking plate, comprising a support frame, a first baffle, a second baffle, and a motor. The first baffle is fixed to the support frame, and the motor is fixed to the first baffle. The output shaft of the motor is connected to the second baffle to drive the second baffle to rotate relative to the first baffle. The first baffle has a plurality of first through holes, and the second baffle has a plurality of second through holes. The second baffle is configured such that, by rotating relative to the first baffle, any one of the second through holes aligns with one of the first through holes on the first baffle. The light-blocking plate of this invention, by driving the second baffle to rotate relative to the first baffle via a motor, allows for convenient adjustment of the position of transmitted light.

The utility model discloses a bidirectional light emitting's wall lamp, including the lamp body, opposite the lens illumination mechanism and adjustable illumination mechanism of being equipped with on the lamp body, wherein the lamp body is also by shell, backplate and light source module composition, wherein, light source module is by element loading box and seal cover composition, and element loading box realizes its inside waterproof sealing function under the lid effect of seal cover, then element loading box is set up the light -transmitting part on, and the lens illumination mechanism adopts the spotlight lens of directly facing the light -transmitting part, makes this light source module have the lighting effect of spotlight irradiation, and adjustable illumination mechanism adopts the light -blocking piece that can swing adjustment in the both sides of light -transmitting part, makes this light source module have the fan -shaped lighting effect of adjustable range, and the expandability of bidirectional light emitting wall lamp both ends lighting effect has been improved greatly.

The utility model discloses an adjustable safety grating which comprises an outer shell, an inner shell is movably installed in the outer shell, a limiting sliding groove is formed in the inner wall of the outer shell, a limiting sliding block is movably installed in the limiting sliding groove, a locking motor is installed in the inner shell, and the limiting sliding block is movably installed in the limiting sliding groove. An adjusting lead screw is installed at the output end of the locking motor, a threaded barrel is installed below the adjusting lead screw, a telescopic frame is installed on the right side of the threaded barrel, a connecting column is installed on the right side of the telescopic frame, a moving block is installed on the right side of the connecting column, and an emitter is installed on the right side in the moving block; a limiting column is arranged on the left side in the moving block in a penetrating manner; and the limiting movable groove is formed in the outer surface of the limiting column. According to the adjustable safety grating, the length of the safety grating is adjusted by arranging the inner shell capable of moving up and down in the outer shell to be matched with the telescopic frame, so that different use requirements are met, and the use cost is reduced.

The application discloses a kind of human eye test conoscopy, comprising: front light barrier, the light aperture of the light barrier is not more than 4mm;Imaging lens group, close to object plane, with positive focal length, can be not less than 120 degree field of view incident light rays converge into, and form approximate telecentric intermediate image in rear;Relay lens group, close to image plane, with less than 1 magnification, for imaging intermediate image at image plane;The focal length GF1 of the imaging lens group is less than 16.2mm, the focal length GF1 of imaging lens group and the focal length GF2 of relay lens group satisfy the following relationship: 0.2<GF1 / GF2<0.3;Imaging circle diameter is D1, and the diameter of diaphragm is D2, satisfy: 8<D1 / D2<10.The above-mentioned human eye test conoscopy can realize similar test effect with direct observation of human eye, suitable for testing near-eye display device, and can meet the imaging effect of large image plane, high resolution and no vignetting.

The utility model relates to the technical field of jumper fibers, in particular to a jumper fiber convenient to identify. According to the technical scheme, the optical fiber jumper comprises a jumper wire and connecting plugs, the two ends of the jumper wire are fixedly connected with the connecting plugs, a light guide pipe is fixedly installed in the jumper wire, the two ends of the light guide pipe are located at the positions, close to the two connecting plugs, of the exterior of the jumper wire, and light barriers are fixedly installed at the positions, close to the two ends of the light guide pipe, of the exterior of the jumper wire. And light dispersion plates are fixedly mounted on the sides, close to the light guide pipe, of the outer surfaces of the two light barriers. According to the utility model, when the jumping fiber trend and the connecting plug are searched, the jumping fiber trend and the connecting plug can be rapidly and conveniently identified, and the working efficiency is improved.

A testing device for the maximum tracking angular velocity of a photoelectric system comprises a two-degree-of-freedom rotary table, an integrated light pipe assembly, a portal frame and a clock synchronization unit, the integrated light pipe assembly is installed on one side of an azimuth axis of the two-degree-of-freedom rotary table, and the integrated light pipe assembly comprises a collimator and a diaphragm; the portal frame is composed of two stand columns and a cross beam, the stand columns are located outside the two-degree-of-freedom rotary table, the cross beam is located above the two-degree-of-freedom rotary table, and a mounting plate is arranged below the cross beam. Before testing, the tested photoelectric system is mounted on a mounting plate of the portal frame, so that the center of the tested photoelectric system is longitudinally aligned with the rotating axis of the two-degree-of-freedom turntable, and the critical angular velocity corresponding to the timestamp obtained by the clock synchronization unit is recorded during testing. According to the device and the method, the adaptability problem of the two-degree-of-freedom turntable for testing a large-size and heavy-weight photoelectric system is solved, and the reading accuracy problem of the angular velocity of the two-degree-of-freedom turntable at the moment of tracking loss is solved.

In order to overcome the defects in the prior art, the utility model provides a charging tray fixed-point turnover mechanism and an annular furnace feeding and discharging device, the charging tray fixed-point turnover mechanism comprises a turnover table, the top of the turnover table is a table top for placing a charging tray, one side of the turnover table is an arc-shaped toothed belt, and the toothed belt is arranged in the direction of a vertical interface of the charging tray. And the gear is meshed with a driving gear of the driving device. An arc-shaped long through hole with the same radian as the toothed belt is formed in the side wall of the overturning table, anti-dazzling screens are arranged at the top and the bottom of the arc-shaped long through hole, and the photoelectric sensor is arranged at the anti-dazzling screen at the top or the bottom when the table top of the overturning table receives the material tray. The overturning table is rotationally connected with the fixing support or the device table top through a rotary table rotating shaft at the arc center position of the toothed belt, and the rotary table rotating shaft is arranged in the horizontal axial direction of the material disc. According to the utility model, on the basis of not obviously changing the equipment structure of the existing heat treatment production line, the automatic overturning of the charging tray can be realized, and the production efficiency is improved.

The utility model provides an angle pyramid light barrier switching device belongs to optical axis calibration technical field. The device includes stepping motor, angle pyramid prism, light barrier subassembly and light barrier rotating subassembly, angle pyramid prism fixed connection stepping motor's shell, light barrier rotating subassembly swing connection light barrier subassembly and fixed connection stepping motor's output shaft, be used for under the drive of stepping motor drive light barrier subassembly rotates on stepping motor's shell, light barrier subassembly can intercept the incident light path of angle pyramid prism in the rotating process. The utility model replaces the whole translation of angle pyramid prism with the partial swing of light barrier subassembly, has the advantages such as compact structure, reduce the equipment volume, accurate positioning and stable operation, guarantees the accuracy of optical axis calibration.

The utility model relates to a globe, in particular to a globe convenient for efficiently demonstrating and observing revolution and rotation effects, which comprises a support main body, an earth body, a light barrier, an illumination light source and a point light source, the support main body is connected with a first support through a first clamping shaft, and the support main body is connected with a second support through a second clamping shaft; clamping holes allowing the first clamping shaft and the second clamping shaft to penetrate through are formed in the two ends of the earth body respectively, the light barrier is arranged in the earth body and rotationally arranged between the first support and the second support, the illumination light source is arranged on the light barrier, the light barrier is provided with an electric connector A, and the electric connector A is electrically connected with the illumination light source and the point light source. The first support is provided with an electric connector B which is electrically connected with the power source and rotationally matched with the electric connector A. The point light source is arranged in the middle of the light barrier, the lighting source and the point light source are arranged on the same side, the point light source is arranged on the light barrier, the structure is more compact, and the sight of an observer cannot be shielded.

The utility model relates to a testing tool for a light blocking strip, and relates to the field of testing tools for automobile light blocking strips. The device comprises a testing seat, the testing seat comprises a base plate, a first side plate and a second side plate, the first side plate and the second side plate are vertically installed on the two sides of the base plate respectively, the base plate, the first side plate and the second side plate are integrally formed, an adjustable solenoid frame is horizontally installed in the first side plate, and a first clamping frame is installed in the adjustable solenoid frame. According to the integrated design of the test seat and the reasonable installation mode of all the parts, the structural stability of the whole test tool is guaranteed, various forces in the test process can be borne, and test errors caused by tool shaking are reduced. The adjustable design of the first clamping frame enables the testing tool to adapt to the light blocking strips with different lengths, and the flexible sliding of the vertical pressing frame and the selective installation of the positioning vertical sheet can meet the testing requirements of the light blocking strips with different shapes and sizes.

The utility model relates to the technical field of shadowless light sources, and provides a 360-degree detection shadowless light source device, which comprises a first arc-shaped plate and a second arc-shaped plate, the first arc-shaped plate and the second arc-shaped plate form a cavity, and the cavity is used for moving a piece to be detected; the first diffuse reflection layer is arranged on the inner side surface of the first arc-shaped plate; the second diffuse reflection layer is arranged on the inner side surface of the second arc-shaped plate; the first light source is arranged in the cavity and irradiates a first diffuse reflection layer on the first arc-shaped plate, and the first diffuse reflection layer reflects irradiation light of the first light source to the second arc-shaped plate; the first light source and / or the second light source are / is blocked by the light barrier and do not directly irradiate the image capturing area, so that the to-be-detected piece is moved to the image capturing area and is not directly irradiated by the first light source and the second light source; instead, the to-be-detected piece is irradiated by the reflected light of the first diffuse reflection layer and the second diffuse reflection layer, so that the to-be-detected piece can be illuminated by 360 degrees, and the detection cannot be influenced by too bright irradiation.

The present disclosure relates to an optical system of a fundus camera with a light barrier, which comprises an illumination device, a first optical assembly, a second optical assembly, an imaging device and a positioning device; the illumination device comprises an illumination light source; the first optical assembly comprises a first half-transmission half-reflection mirror, a first polarizer, a second half-transmission half-reflection mirror and a retinal objective lens, the first optical assembly directs the light beam from the illumination light source to the fundus of the eye to be examined, and guides the reflected light of the fundus to the second optical assembly; the second optical assembly comprises a second polarizer and a focusing module, the focusing module guides the reflected light to the imaging device; the imaging device receives the light from the second optical assembly to form the fundus image; the positioning device comprises a guiding light source and a light barrier, the light beam of the guiding light source has a preset shape after passing through the light barrier, the imaging device acquires the fundus images of different regions of the eye to be examined based on the guiding light source, and the first optical assembly directs the light beam of the guiding light source to the fundus of the eye to be examined for imaging.

The utility model relates to the technical field of gas chromatographic instruments, and discloses a portable gas chromatographic device capable of quickly screening, which comprises a bottom shell, a top cover is rotatably connected to the rear end of the top of the bottom shell, the front side of the outer wall of the bottom shell is connected with the top cover through a fixing component, slots are formed in the left end and the right end of the front side of the top cover, and the top cover is connected with the bottom shell through a fixing component. A sliding block is slidably connected to the inner wall of the inserting groove, second limiting grooves are formed in the top ends of the left side and the right side of the outer wall of the top cover, the second limiting grooves are connected with the sliding block through sliding assemblies, a connecting block is detachably connected to the inner wall of the inserting groove, a through groove is formed in the front side of the connecting block, and a light barrier is fixedly connected to the bottom end of the front side of the connecting block. According to the utility model, through the light blocking structure formed by the slot, the slide block and the like, the problem that outdoor data checking is inconvenient is solved, and the detection convenience is improved; meanwhile, by utilizing structures such as a shaft rod, the device can be quickly and stably opened and fixed, shaking is avoided, and the accuracy of data during soil organic pollutant detection is guaranteed.

The utility model provides a rotary film tearing mechanism, which relates to the field of mechanical automation and comprises a film tearing mechanism, a vertical moving mechanism and a reset detection component, the film tearing mechanism comprises a first driving mechanism, a second driving mechanism and a clamping jaw; the clamping jaw is horizontally arranged; the second driving mechanism drives the clamping jaw to clamp or open; the first driving mechanism drives the clamping jaw to rotate; the vertical moving mechanism drives the clamping jaw to move in the vertical direction; the reset detection assembly comprises a plurality of photoelectric sensors and a light blocking sheet; the light blocking piece moves in the vertical direction along with the clamping jaw. All the photoelectric sensors are distributed along the vertical direction; an emitter and a receiver of the photoelectric sensor are connected into a first straight line; the first straight line is horizontally arranged; the light blocking sheet is located between the emitter of the photoelectric sensor and the receiver of the photoelectric sensor. The film tearing mechanism can solve the problems that in the prior art, the clamping jaw cannot achieve accurate movement, possibly, the clamping jaw cannot clamp or only clamps part of the release film, and therefore the film tearing efficiency and the film tearing precision of the film tearing mechanism are reduced.

The utility model relates to the technical field of lighting equipment, and discloses a horizontal light scattering LED lamp which comprises a lamp shell, an LED lamp body is installed at the bottom end of the lamp shell, an LED main control board is installed in the lamp shell, supporting strips are fixedly connected to the two sides and the two ends of the front end of the lamp shell, light barriers are arranged outside the supporting strips, and the light barriers are connected with the LED main control board. The inner side of the light barrier is fixedly connected with a light scattering piece, the light barrier is fixedly connected with a C-shaped buckle, a positioning bolt is installed on the C-shaped buckle, and heat dissipation openings are formed in the two sides of the lamp shell. According to the LED lamp capable of horizontally dispersing light, the horizontal heat dissipation effect of the lamp is improved through the light dispersing cover, the light barrier outside the lamp shell can be adjusted according to the heat dissipation requirement, during adjustment, the light barrier is rotated to a proper installation angle firstly, the C-shaped buckles on the light barrier rotate on the supporting strips, then the light barrier can be positioned by rotating and tightening the positioning bolts, and therefore the light dispersion effect is improved. The light barrier can be directly detached from the supporting strip, and the problem that the horizontal light scattering effect is poor is solved.

The invention discloses a current induction electricity taking type light-emitting obstacle ball, and belongs to the technical field of obstacle balls. The obstacle ball comprises a ball body outer shell, a ball body inner shell and a ball body outer shell, the light-emitting module comprises light bars which are arranged in the circumferential direction of the inner surface of the spherical shell; the current induction electricity taking module is clamped on a power transmission line wire and is used for obtaining electric energy through electromagnetic induction; the energy storage buffer module is electrically connected with the current induction electricity taking module and is used for storing electric energy and stabilizing output voltage; the intelligent control module is electrically connected with the energy storage buffer module and the light-emitting module and used for controlling the working state of the light-emitting module; the spherical shell is fixed on a power transmission line lead through a clamping structure. Electricity is directly taken from the high-voltage line through electromagnetic induction, self power supply is achieved, 360-degree omnidirectional light emitting is achieved by adopting the sphere structure and the circumferential light bar design, and the 360-degree omnidirectional light emitting device has the advantages of being compact in structure, convenient to install, free of maintenance and good in warning effect.

The invention relates to the field of mercury lamp exposure equipment, in particular to a mercury lamp exposure box. Comprising a box body, an opening and closing door, an area light source mercury lamp, a height adjusting assembly, a supporting plate, an inching switch and an external electric box. Wherein the height adjusting assembly can accurately adjust the distance between the supporting plate and the area light source mercury lamp, the supporting plate is provided with a light barrier, a heat dissipation hole and a limiting groove, it is ensured that an object to be exposed receives uniform illumination at the optimal position, meanwhile, heat is effectively dissipated, and exposure of a non-target area is prevented. In addition, an air inlet fan and an air outlet fan are further arranged in the box body, so that the heat dissipation efficiency is further improved. The purpose of improving the exposure quality and the production efficiency is achieved, and meanwhile the safety and the stability of equipment are guaranteed.

The utility model discloses a fixing device for spectral measurement of a large-size optical filter. The fixing device comprises a light barrier, a center measurement mechanism and an edge measurement mechanism, a light through hole penetrates through the light barrier; a first movable backup plate in the center measuring mechanism is movably arranged on a first mounting bottom plate through a first guide limiting structure, so that the first movable backup plate is close to a first fixed side plate to form a first optical filter fixing cavity, and the first optical filter fixing cavity is arranged corresponding to the light through hole to realize the light splitting effect of detecting the center position of the optical filter to be detected; a second movable backup plate in the edge measuring mechanism is movably arranged on a second mounting bottom plate through a second guide limiting structure, so that the second movable backup plate is close to a second fixed side plate to form a second optical filter fixing cavity, the second optical filter fixing cavity is arranged corresponding to the light through hole, and the second mounting bottom plate is movably arranged on a limiting sliding seat; and the second optical filter fixing cavity is driven to transversely move relative to the light through hole, so that the light splitting effect of the to-be-detected optical filter at different edge positions at the same height is detected.

The utility model discloses a light source adjusting device of a thin-layer chromatography scanner, and relates to the technical field of thin-layer chromatography scanners. The scanner comprises a scanner main body, a scanning table, a circuit board and a halogen tungsten lamp, the circuit board is installed inside the scanner main body, the halogen tungsten lamp is installed on a lamp holder of the circuit board, and a light source mechanism is arranged inside the scanner main body. The first gear drives the worm to rotate, the worm drives the worm gear to rotate, the transmission speed can be further reduced, the worm gear drives the transmission shaft to rotate, the transmission shaft drives the grating to rotate slowly and uniformly through the first rotating shaft, the situation that the grating is difficult to rotate uniformly through manual operation can be avoided, and the purpose of uniform-speed rotation is achieved. The threaded rod rotates to drive the moving block to move, the moving block drives the connecting block to move, and the connecting block drives the focusing lens to move, so that the position of the focusing lens can be adjusted to effectively focus light rays, and the purpose of improving the focusing effect is achieved.

A smoke detector (2) according to the invention comprises a transmitter (4) for emitting electromagnetic radiation through an exit opening (28) and a receiver (8) for receiving electromagnetic radiation through an entry opening (30), wherein the transmitter (4) and the receiver (8) are arranged inside the smoke detector (2) and are designed and oriented such that they define a measuring range (22) outside the smoke detector (2). A light barrier (34) is arranged at least on the surface (12) of the smoke detector between the transmitter (4) and the receiver (8).

The application discloses a wave-particle duality demonstration teaching device, and relates to the technical field of wave-particle duality demonstration teaching, which comprises a wave-particle duality device and an upper computer software operating system, wherein the wave-particle duality device comprises a single-photon source system, a combined prism system, a photon collection system and an electronic control system; the combined prism system comprises a first prism, a second prism and a light shield; the first prism and the second prism make the second polarized light output by the single-photon source system carry out Mach-Zehnder interference under the set adjustment angle of the light shield, and an interference light path is obtained; the electronic control system is used for counting the photons detected by a single-photon detector; and the upper computer software operating system displays the detection result. The wave-particle duality can be directly demonstrated through the wave-particle duality device and the upper computer software operating system, and the change of the photons can be observed only by adjusting the light shield, so that the operation is convenient.

The invention relates to a medium-wave infrared continuous zooming optical system with a large relative aperture and application thereof. The optical system comprises a front fixed group, a zoom group, a compensation group, a rear fixed group, a secondary imaging fixed group, a refrigeration detector cold diaphragm and a focal plane which are sequentially arranged on the same optical axis, the front fixed group comprises a first positive meniscus lens 1 and a first negative meniscus lens 2, the zoom group is a biconcave lens 3 with negative focal power, the compensation group is a biconvex lens 4 with positive focal power, and the rear fixed group is a biconvex lens 5 with negative focal power. The rear fixing group comprises a second negative meniscus lens 5 and a second positive meniscus lens 6. The secondary imaging fixing group comprises a third negative meniscus lens 7 and a third positive meniscus lens 8. The relative aperture of the optical system is 1 / 2, the diameter is greater than 200 mm, the total length does not exceed 360 mm, the focal length range is 50-400 mm, the working wave band is 3-5 [mu] m, the matching surface width is greater than 20.5 mm, the optical system has the advantages of large relative aperture, compact structure, large target surface and the like, and the problem that the existing medium-wave refrigeration zoom system has weak target detection capability for long distance and small temperature difference is solved.