Green laser pointer can be used to make the special atmosphere

The main task of research and target. The main tasks and requirements of the main task of this graduation project is to conduct research at home and abroad laser and optical detection system designed for cylindrical product line, designed a variety of circuit, use of MCU products diameter calculation, measurement, and displays the results. Target. Knowledge and understanding of the photoelectric detection technology. Learning and application programming software. Research to understand the status of the photoelectric detection system, the requirements for the subject, given the overall design, the laser line measured from both hardware and software design diameter instrument. Design. The measurement principle.  green laser pointer  can be used to make the special atmosphere in the special place.
At present, the commonly used two non-contact measurement method, a measurement method is based on the CCD device to receive the optical signal, the other is the laser scanning method. Both methods have their advantages and disadvantages, let's take a look at their works. The first measurement principle: CCD size measurement [4], the CCD size measurement system basically by the CCD image sensors, optical systems, computer data acquisition and processing system, we first look at the CCD measurement principle: Figure 1 shows the The linear CCD parallel light method, the basic principle of non-contact measurement: linear CCD placed parallel to the optical path. The 2 in 1 type green laser pointer means the laser pointer has two kinds of laser heads.
The measured object is placed on the CCD in front of the light path, and fired at the CCD light on the object blocking part of the CCD output signal has a notch. Obviously, the width of the notch and the size of the object to one relationship, we use digital circuit design and computer processing, it is easy to -2 - notch corresponds to the CCD pixel number, in order to estimate the size of the object. But we also very easy to find a problem: This measurement method requires the length of the CCD photosensitive area is greater than the size of the object, while the large size of the CCD is particularly expensive, it must be by other means to achieve a light reception. Parallel beam measured object CCD intensity distribution. It is the laser effect of green laser pointer  they want according to the real needs and actual situation.
Figure 1 CCD size to measure the basic principles obviously CCD, it has the incomparable advantage of unique mechanical, optical, electromagnetic measuring instrument, which is accurate and compact location of the CCD itself, self-scanning high-resolution high-sensitivity structural characteristics of are closely related. The key technology is the design of the optical system and CCD output video signal acquisition and processing. But there are many common issues, such as the complex structure, the cost of shortcomings. Let us look at what are the disadvantages of CCD measurements: (1) using a CCD camera then converted into digital signals, the measurement accuracy is limited by the CCD pixel size. The 3 in 1 type green laser pointer means the laser pointer which has three kinds of laser heads.