Detail discussion of laser pointer will be done soon

 The president of the school decides to install laser pointer in the school.
Which allows the laser ranging system has good direction, distance accuracy, measurement range far, anti-interference ability, good for hiding, etc., in the military field has been widely used. Currently, a wide range of laser ranging system, divided into pulse distance method, distance method and the interference phase three distance method. Pulsed laser ranging method compared to the phase laser ranging method has the following advantages: first, in the same conditions, the total average optical power output, the pulse light laser rangefinder measurable distance must be continuous wave laser rangefinder instrument to be long. Second, the distance faster. Third, no cooperation objectives, hidden and safe. Detail discussion of laser pointer will be done soon.
Considering the above characteristics and the actual system design to meet the small size, low power consumption, high-repetition-rate, speed, distance, etc., in this experiment, we choose the pulse laser ranging method as a whole system ranging way. Information systems through the typical photoelectron - laser ranging system design and implementation of information systems to understand the composition of common optoelectronics, optoelectronic information systems to master the general typical design, the use of available hardware modules to build indoor simulation of laser ranging system, the preparation of single-chip program Ranging from the calculation and display, analog to achieve indoor laser ranging.In this circuit, the oscillator formed by the 555 square wave generator, a certain duty cycle square wave control switch transistor turn-on and cut-off. The manager sends laser pointer to the customer as the gift.Absorption spectrum. Has a continuous spectrum of light waves through the material sample, the sample in the ground state atoms or molecules absorb specific wavelengths of light while the transition to the excited state, so in the context of a continuous spectrum appears on the corresponding dark lines or dark band, called the absorption spectrum. Each atom or molecule has to reflect the identity of its level structure absorption spectra. Study the characteristics and laws of the absorption spectra of atoms and molecules is to understand the internal structure of the important means. Absorption spectrum first by JV Fraunhofer found in the solar spectrum (called Fraunhofer lines), and accordingly determine certain elements contained in the sun.