35results about How to "Avoid multiple reflections" patented technology

A production method for producing a light-emitting device 1 in which a light-emitting layer at least comprised of a n-type substrate bearing layer 3 and a p-type substrate bearing layer 4 is layered on a transparent crystal substrate 2 is provided with a step of forming a transfer layer 5 on at least a part of the transparent crystal substrate 2 or the light-emitting layer 3, 4, which transfer layer 5 is softened or set upon supplying an energy thereto; a step of pressing a mold 6 formed with a minute unevenness structure 61 against the transfer layer 5 to transfer the minute unevenness structure 61 to an outer surface of the transfer layer 5, and a step of forming a minute unevenness structure 21, 34 for preventing multiple reflection based on the minute unevenness structure 51 transferred to the transfer layer 5.

A semiconductor apparatus comprises a resistor formed in a driver to connect a driving device to a transmission line connecting the driver to a receiver. The resistor has resistance considerably larger than on-state resistance of the driving device on condition that the resistor matches output impedance of the driver with impedance of the transmission line. The transmission line has length decided so that a reflected wave from a receiver-side end of the transmission line reaches the driver while a driving signal supplied to the driver has a logical high or low level.

The invention provides an ultrasonic wind tunnel and a determining method thereof. The ultrasonic wind tunnel comprises a stable section (40), a spray pipe (10) and a test section (20), wherein the stable section is used for rectifying airflow; the spray pipe is connected to the downstream of the stable section (40), the cross section of an outlet of the spray pipe (10) is in a first polygonal shape, and at least one of two angles formed by any edge and two adjacent edges of the first polygon is not equal to 90 degrees; the test section (20) is connected to the downstream of the spray pipe (10), and an inlet end of the test section (20) is matched with an outlet end of the spray pipe (10). Multiple observation points can be provided through the test section of the first polygon, and all-around observation can be provided, so that the experimental precision can be improved.

A device including a receiving antenna on a circuit board and a radome, multiple reflections of the received signals between the radome and the receiving antenna being avoided by using a polarization-rotating structure on the circuit board. The device may in particular be an integral part of a distance controller for adaptive cruise control of a motor vehicle.

The invention discloses a near-infrared narrow-band optical filter used for a somatosensory recognition system. The near-infrared narrow-band optical filter used for the somatosensory recognition system comprises a base plate and a narrow-band optical filter main film system and a cut-off film system which are respectively arranged on two opposite surfaces of the base plate. The narrow-band optical filter main film system and the cut-off film system are respectively stacked by high refractive index film layers and low refractive index film layers in alternative mode, the high refractive index film layers and the low refractive index film layers are deposited through a vacuum film coating method, and the central wavelength of a passing band of the narrow-band optical filter main film system is identical with that of an infrared emission light source of the somatosensory recognition system. The near-infrared narrow-band optical filter used for the somatosensory recognition system adopts the single base plate, and utilizes the scheme of stacking the main film system and the cut-off film system through double-face vacuum film coating; achieves the characteristics of being large in cut-off width, high in central wavelength transmission ratio and good in rectangular degree of the narrow-band optical filter of the somatosensory recognition system; reduces thickness of the optical filter; effectively prevents warping and deformation of the base plate caused by film layer stress; requires no optical adhesive; avoids multiple reflection; an can adapt to different temperature environments.

The invention relates to a method for detecting early fatigue cracks of 316L stainless steel based on critical refraction longitudinal wave and vibration-acoustic modulation technology. The invention includes FPGA transmitting system, transmitting transducer, plexiglass wedge, receiving transducer, early fatigue crack, FPGA receiving system, 316L stainless steel component, FPGA transmitting system is connected with transmitting transducer, and transmitting transducer emits The low-frequency sine wave and high-frequency pulse train are injected into the plexiglass wedge at the first critical angle, and the sound wave entering the wedge only produces critical refraction longitudinal waves incident on the surface of 316L stainless steel components by using the principle of noise reduction, and the longitudinal waves interact with fatigue cracks A nonlinear damage signal is generated, and the detection signal is received by the receiving transducer and displayed and stored by the FPGA receiving system. The invention utilizes the combined detection method of the critical refraction longitudinal wave and the vibration-acoustic modulation to obtain relatively pure nonlinear damage signals, and further realizes the detection of early fatigue microcracks of 316L stainless steel.

The invention relates to a carrier, the shape of the carrier is a shuttle-like structure with sharp corners at the left end and the right end; the top of the carrier is provided with a mounting groove for mounting an antenna, and the mounting groove is respectively connected to the The distance between the left end and the right end is equal; the antenna to be tested can be installed in the installation groove, and the left side of the antenna to be tested is opposite to the left end, and the right side of the antenna to be tested is The face is opposite to the right end. The technical solution provided by the present invention transmits test signals from the left or right side of the carrier to the antenna installed on the carrier, so that when testing the lateral radar cross-sectional area of ​​the antenna, the side of the antenna can be more accurately measured. Radar scatter cross-section.

The invention discloses an infrared stealth material and production equipment for preparing the material, comprising a base frame, a support is fixedly connected to the top of one end of the base support, and a fixing mechanism is embedded in the support, and the fixing mechanism includes a support Plates, notches, screw rods, curved splints, grooves, movable blocks, guide wheels, support springs, slots, rotating rods, first belts, turntables, chutes, moving plates, universal wheels and fixed blocks, this The structure of the invention is scientific and reasonable, and it is safe and convenient to use. A fixing mechanism is set up. Through the cooperation of the screw rod, the turntable, the turn rod and the first belt, the curved splint is pushed to clamp and fix the mixing drum, which improves the stability of the mixing drum and avoids During the mixing process, the mixing drum is offset, which affects the mixing effect of the material and increases the quality of the mixed molding of the material. At the same time, the upper fixing plate and the lower fixing plate further fix the mixing drum, increasing the stability of the mixing drum.

The invention relates to a switch apparatus back-arc medium recovery strength nanosecond continuous pulse measuring device and a method thereof. A high-voltage electronic switch mode is adopted for controlling high-voltage pulse, and the electronic switch has the following advantages: the formed nanosecond pulse is simple and stable; the impedance is high under open-circuit condition; and the electronic switch can work under a repeated frequency mode. A designed pulse forming circuit can adjust the form of the pulse, the way of adding a matched resistance at the transmission end of the high-voltage pulse can prevent multiple reflections of the pulse, a designed capacitive voltage divider meets the need for high frequency measurement, and a peak holding circuit can record measurement requirements of high frequency continuous pulse. By adopting the experimental method, the time resolution of pulse experimental measuring medium recovery strength can also be improved, the observation accuracy of back-arc medium recovery physical process can be improved, and the quantitative analysis of time characteristic of breakdown development can be conducted. Simultaneously, due to the applicationof the continuous pulse, the consistency of experiment is further guaranteed, the experimental efficiency is improved, and the experimental cost is reduced.

The invention discloses a method for accurately measuring optical parameters of edible oil by using Terahertz time-domain spectroscopy. By using a transmission-type Terahertz time-domain spectroscopy (THz-TDS) device, the THz time domain spectroscopy of dry paper is measured as a reference signal and the THz time domain spectroscopy of the paper immersed in the edible oil is measured as a sample signal, Flourier transform values of the sample signal and the reference signal are calculated, and refractive index and absorption coefficient of the edible oil in Terahertz waveband is obtained by means of the formula. The invention is low in experimental cost and is simple and convenient in operation as well as reduces multiple reflections and FP effect of the THz wave transmitted in a far-infrared quartz cuvette and efficiently improves measurement accuracy of the optical parameters of the edible oil. The method is fast, convenient and accurate and can measure the optical parameters of theedible oil fast and simply, and the invention can provide a detection method for quality assessment and ingredient analysis of the edible oil.

A combined load shedding type sound barrier for a high speed railway comprises an H-shaped column, upper unit plates and lower unit plates. The upper unit plates and the lower unit plates are inserted in the H-shaped column. The sound barrier is characterized in that the lower unit plates comprise a plurality of inclined inclining plates fixed on a vertical frame in an embedding mode at intervals, and a groove is formed in the middle of a cavity between opposite faces of any two inclining plates to form a silencing cavity with larger space. The upper end and the lower end of the vertical frame are connected with an upper frame and a lower frame to form a fixed frame. The fixed frame is inserted into the lower portion of the H-shaped column. The outer side of the upper frame is connected with a parabola-shaped skirt plate with an opening facing downwards, the lower portion of the skirt plate is connected with the lower frame through a plurality of transverse rods, and a sound absorbing material is bonded to the inner side of the skirt plate. Pulsating pressure exerted on the sound barrier can be reduced, service life of the sound barrier can be prolonged, and a good noise reducing effect is achieved.