激光发展史英文文献.docx

1、激光发展史英文文献Chinas laser technology development Retrospect and Prospect Laser is LASER translation. LASER was originally Light amplification by stimulated emissi on of radiation from a combination of the prefix specific terms, in our country has been translated into Laise, lasing light, and optical amp

2、lifier by stimulated emission. 1964, Qian Xuesen academicians proposal named Laser, reflects not only the stimulated emission, the scientific connotation, and that it is a very strong source of new, appropriate, vivid and concise, by the Chinese scientific community consensus and in use ever since.

3、From the 1961 China first laser that has successfully developed throughout the country, laser research, teaching, production and use of units under joint efforts, China has formed a complete range, the advanced level, the application of laser technology to a wide range of fields, and made the indust

4、rialization of encouraging progress for Chinas science and technology, national defense and national economy and made positive contributions in the international arena has also gain a place. Chinas early development of laser technology 1957, in Changchun Wang Shouguan, such as Chinas first professio

5、nal optical Institute - the Chinese Academy of Sciences (Changchun) optical precision instruments Machinery Research Institute ( -ray machine). In the older generation of experts under the leadership of a number of young science and technology workers will grow rapidly, Deng Ximing is one of the out

6、standing representatives. As early as in 1958 the United States physicist Xiaoluo, Townes on the principle of laser famous paper published soon, he will actively promote this new technology research carried out in a short time the combination of the innovative spirit of the young and middle-aged res

7、earch team proposed substantial increase brightness light source, color units, coherence of ideas and experimental programmes. 1960 World first laser come out. Summer 1961, under the auspices of Wang Jiang, Chinas first ruby laser developed. Within a short space of a few years, laser technology deve

8、loped rapidly, and produce a number of advanced achievements. Various types of solids, gases, chemicals and semiconductor lasers have been successfully developed. In the basic research and key technologies, a series of new concepts, new methods and new technologies (such as mutation and cavity Q-to-

9、Q, traveling wave amplification, Re-use system, free electron oscillations radiation, etc.) have been put forward and implemented, and many of them are unique. At the same time, as a high-brightness, high-directional, high-quality, and other advanced features of the new light source, laser used in v

10、arious technical fields quickly, demonstrating a strong vitality and competitiveness. Communications, in September 1964 by television pictures transmitted laser demonstration, in November 1964 to achieve 3 to 30 km calls. Industries, in May 1965 laser drilling machine successfully used Drawing Die B

11、lanking production, acquisition significant economic benefits. Medicine, June 1965 retinal laser welding for the animals and conduct clinical trials. National defense, in December 1965 successfully developed laser rangefinder Diffuse Reflectance (accuracy of 10 meters / 10 km), in April 1966 develop

12、ed remote control pulse laser Doppler velocimeter.Along with the theory study of the laser self-mixing interference becoming maturer higher increasingly, the application in vibration, micro-displacement and velocity measure based on this technology become broader. The technic requires real-time acqu

13、isition and processing for the laser interferometer signal. The data acquisition and processing system of traditional vibrometer is structural complex, high cost and difficult to carry. With the high running speed and high-precision computing, digital signal processor(DSP) is suitable for the laser

14、self-mixing interference signal acquisition and processing. In this paper, the technology of laser self-mixing interference modulated by triangular wave current is researched. It studies theoretical model of the vibration system and uses Matlab for algorithms simulation and error analysis, also disc

15、usses how to minish the error. A data acquisition and processing system which adopts TMS320LF2407A DSP from TI as a central processor is designed. The designing and realization plan of system for hardware is proposed in detail, including DSP mini system, DSP and ADC interface circuit, signal conditi

16、oning circuit, LCD display module and DSP interface circuit, RS232 communication circuit etc, technology on hardware designing is also discusssed in the dissertation. The designing and realizing process of system for software is analyzed as followed, which consists of application of CCS, planning of

17、 CMD document, data acquisition and processing module, LCD display module and serial communication module based on Matlab. Practice shows that this data acquisition and processing system can withstand stable operation, satisfy the demand of the high-speed alternating laser self-mixing interference s

18、ignal and reconstructs the vibration waveform of detected objects. Because of the DSP technology, the cost of vibrometer greatly reduced and simplified structure, easy to carry. It also provides the conditions for the vibrometer which is based on laser self-mixing interference to small, intelligence

19、, and portable. It has a wide application prospect.Brief introduction of51MCUDescriptionThe AT89C51 is a low-power, high-performance CMOS 8-bit microcomputer with 4K bytes of Flash programmable and erasable read only memory (PEROM). The device is manufactured using Atmels high-density nonvolatile me

20、mory technology and is compatible with the industry-standard MCS-51 instruction set and pinout. The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel A

21、T89C51 is a powerful microcomputer which provides a highly-flexible and cost-effective solution to many embedded control applications.Function characteristicThe AT89C51 provides the following standard features: 4K bytes of Flash, 128 bytes of RAM, 32 I/O lines, two 16-bit timer/counters, a five vect

22、or two-level interrupt architecture, a full duplex serial port, on-chip oscillator and clock circuitry. In addition, the AT89C51 is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes. The Idle Mode stops the CPU while allowing the

23、RAM, timer/counters, serial port and interrupt system to continue functioning. The Power-down Mode saves the RAM contents but freezes the oscillator disabling all other chip functions until the next hardware reset.Pin DescriptionVCC：Supply voltage.GND：Ground.Port 0：Port 0 is an 8-bit open-drain bi-d

24、irectional I/O port. As an output port, each pin can sink eight TTL inputs. When 1s are written to port 0 pins, the pins can be used as highimpedance inputs.Port 0 may also be configured to be the multiplexed loworder address/data bus during accesses to external program and data memory. In this mode

25、 P0 has internal pullups.Port 0 also receives the code bytes during Flash programming,and outputs the code bytes during programverification. External pullups are required during programverification.Port 1Port 1 is an 8-bit bi-directional I/O port with internal pullups.The Port 1 output buffers can s

26、ink/source four TTL inputs.When 1s are written to Port 1 pins they are pulled high by the internal pullups and can be used as inputs. As inputs,Port 1 pins that are externally being pulled low will source current (IIL) because of the internal pullups.Port 1 also receives the low-order address bytes

27、during Flash programming and verification.Port 2Port 2 is an 8-bit bi-directional I/O port with internal pullups.The Port 2 output buffers can sink/source four TTL inputs.When 1s are written to Port 2 pins they are pulled high by the internal pullups and can be used as inputs. As inputs,Port 2 pins

28、that are externally being pulled low will source current, because of the internal pullups.Port 2 emits the high-order address byte during fetches from external program memory and during accesses to external data memory that use 16-bit addresses. In this application, it uses strong internal pullupswh

29、en emitting 1s. During accesses to external data memory that use 8-bit addresses, Port 2 emits the contents of the P2 Special Function Register.Port 2 also receives the high-order address bits and some control signals during Flash programming and verification.Port 3Port 3 is an 8-bit bi-directional

30、I/O port with internal pullups.The Port 3 output buffers can sink/source four TTL inputs.When 1s are written to Port 3 pins they are pulled high by the internal pullups and can be used as inputs. As inputs,Port 3 pins that are externally being pulled low will source current (IIL) because of the pull

31、ups.Port 3 also serves the functions of various special features of the AT89C51 as listed below:Port 3 also receives some control signals for Flash programming and verification.RSTReset input. A high on this pin for two machine cycles while the oscillator is running resets the device.ALE/PROGAddress

32、 Latch Enable output pulse for latching the low byte of the address during accesses to external memory. This pin is also the program pulse input (PROG) during Flash programming.In normal operation ALE is emitted at a constant rate of 1/6 the oscillator frequency, and may be used for external timing

33、or clocking purposes. Note, however, that one ALE pulse is skipped during each access to external Data Memory.If desired, ALE operation can be disabled by setting bit 0 of SFR location 8EH. With the bit set, ALE is active only during a MOVX or MOVC instruction. Otherwise, the pin is weakly pulled high. S