In view of low precision of existing semiconductor laser micro displacement real-time interference measuring instrument and the difficulty to adjust, this article proposes a normalized technology and demarcation technology, develops one kind of semiconductor laser vibration real-time interference measuring instrument which has the adjustment function, analyzes its real-time surveys principle and demarcation method. This interferometer carries on processing using normalized electric circuit and real-time phase discriminator to process interference signals, and has realized high accuracy real-time examination of micro displacement. Its measurement result has nothing to do with system parameter luminous intensity, initial light path difference, electric circuit enlargement factor, modulation depth and Bessell function value. Demarcation technology has been carried on to the interferometer, which further increases the measuring accuracy of interferometer. Experimental result confirms the feasibility of this interferometer and its measuring accuracy surpasses 3.89nm.The survey time is smaller than 50μs.
Movement frequency of atmospheric turbulence is varied between a few Hz to hundreds Hz. when laser is transmitted in atmospheric some characteristic will be changed by turbulence modulation. The energy distribution form and shape of spot will be varied with movement frequency of turbulence. When spot is detected by four-quadrant detector output of detector will be effect. In order to test effect of turbulence to detector and ensure output signal can be amplified and processing effectively a kind of spot detection circuit was designed in turbulent environment. Two bands amplification was used in system. The noise suppression was completed in first band and variable gain amplifier was used in second to meet require of light intensity. Testing system was set up which can research characteristic of quadrant detector in turbulence. Experiment of spot detection in field was done. Distance from transmitting to receiving is 800m and 12.5km. Conclusions have been obtained by experimental when Distance is 800m subdivision can be up to 7 in photosensitive surface. At the same time we can see that impact of turbulence on laser transmission is a combination result with modulation of high and low frequency. And ability to spot detection has been invalid in 12.5 kilometers distances because of photosensitive surface occupied by noise from impact of turbulence, which show subdivision of quadrant detector has been broken in long distance.
In this paper, a design scheme of an automobile low-beam light illumination system with a reflector free-form surface is presented. Per the energy grid mapping theory and edge ray theory, an oblique triangular energy mapping scheme was proposed, and the free-form reflector was obtained by geometric iterative calculation. The Monte Carlo ray tracing method was used to simulate the system. The simulation results met the regulatory requirements of ECE R112, and the light efficiency could reach 81%. The length, width, and height of the reflector were 55.61 m m × 22.02 m m × 23.70 m m . The reflector achieves a special light type through precise light distribution, does not need other shielding objects, and has the advantage of small size.
This paper focuses on the embedded laser target simulation system based on RTX(Real Time Executive).This system completes the seeker test mission mainly by means of simulating the process of the missile from launch to hit the target through controlling the Laser spot. The system is consisted of upper computer, spot energy adjustment and spot size adjustment. The whole system realizes continuous and rapid adjustment to the energy and size of the spot via the RTX embedded computer system sends control commands to each controller of two units simultaneously .The unit of spot size adjustment: the controller controls the movement of the leading screw and then the leading screw controls the shift of the lens. The motor which controls the movement of the leading screw is direct current torque motor. The unit of spot energy adjustment: According to the Lambert law, the structure uses two crystals that the wedge angles are exactly the same. The system controls the motor to change the relative position of these crystals and then changes the thickness of the optical path crystal to adjust the laser spot energy. This system utilizes RTX embedded system to send control commends s in real time, a share memory area is opened for exchanging the simultaneous data between Windows and RTX. The real-time performance of the whole system has a significantly improve by using RTX embedded system, the system response time reduces to 1ms。Thus the laser target achieves rapid changing which seeker test requirement. 1.REFERENCEFrom the 1960s to recent time, semi physical simulation technology has always been popular.Americans pay so much attention on the application and research on semi physical simulation technology for the system they designed can effectively reduce the cost of missile defence and tactical missile weapon system. System simulation has been the key one of weapon research. The most advanced semi physical simulation technology labs are always hold by NASA and defense contractor.Progressiveness of semi physical simulation technology mainly reflect on fast and high accurate replicating machine, progressiveness and sigmacompleteness of environment simulation equipment. In our country, semi physical simulation technology has reached a high level on missile guidance, satellite attitude control, and rocket control.The ultimate index of the whole simulation system is analog controlled unit reaction time. To rise reaction time, we firstly use RTX, achieving fast control in optical system. 2.SYNOPSIS OF RTXRTX(Real-Time Extension) based on Windows embedded operating system is developed by USA
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