With the requirement of scientific imaging for microscopic imaging (using the common saying: microscope camera), CCD imaging equipment is getting more and more attention from researchers, but some netizens face many brand models but have no choice but to choose. Everyone generally pays attention to the number of pixels of the CCD when purchasing the CCD. In addition to the resolution, in fact, other performance indicators of the CCD are more worthy of consumers' attention, such as chip size and pixel size.
1. CCD (camera) is the abbreviation of English Charge Coupled Device, which means a charge coupler. It is a photosensitive element based on metal-oxide-semiconductor (MOS) technology. It is covered with many photosensitive elements, each photosensitive element. We call it a pixel. The CCD is an extremely important component in the camera. It acts to convert light into an electrical signal, similar to a human eye, so its performance will directly affect the performance of the camera. At present, CCD has the advantages of wide spectral response range, low detection limit, wide dynamic range, low dark current and readout noise, and the ability to integrate signals, multi-channel simultaneous detection signals and real-time monitoring.
Second, the main factors determining the imaging quality of the CCD microscope camera: physical resolution, chip size, pixel size, signal to noise ratio, gray value.
Physical resolution: The resolution of the CCD microscope camera itself. Pixels are the most basic units of digital images. Each pixel is a small dot, and dots (pixels) of different colors are combined to become a moving photo. CCD is often classified by pixel as the level. Under the same chip size, The more pixels, the higher the resolution.
Chip size: Digital cameras are mainly 2/3 inches, 1/1.8 inches, 1/2.7 inches, etc. The larger the CCD size, the larger the photosensitive area and the better the imaging effect. For example, a 2/3-inch 3 megapixel camera is usually better than a 1/1.8-inch 4 megapixel camera (the latter has a light-sensing area of ​​only 70% of the former). If it is desired to maintain the existing image quality while increasing the CCD pixels, it is necessary to increase the total area of ​​the CCD on the basis of at least maintaining a single pixel area without reducing. The more professional digital cameras, the larger the CCD size. At present, the processing of larger CCD processing is more difficult and the cost is very high.
Pixel: The basic unit that constitutes the CCD photosensitive layer. The order of magnitude is in the order of microns. The more pixels on the CCD unit area, the finer the image and the higher the resolution. It is a good thing to increase the CCD pixels of the same size, but too much will result in a reduction in the photosensitive area of ​​a single pixel, resulting in underexposure, and mutual interference of optical signals between the individual pixels will affect the image sharpness.
The signal-to-noise ratio is the ratio of the normal light signal generated by the camera CCD to the abnormal signal (noise). The higher the signal-to-noise ratio, the less abnormal signal generation and the more realistic and clearer the image quality.
The unit of gray value is Bit: A term in a computer image that describes the number of colors a generated image can contain. "Depth is 8 bits" means that the image contains only 28 or 256 colors. The higher the gray value, the more grayscale the camera can resolve and the richer the color.
Third, buy the camera preparation steps
The first step: clearly use the purpose and purpose of purchasing a CCD microscope camera
It is very important to determine the purpose and purpose of purchasing a CCD. Only by understanding our own needs can we choose and purchase the machines we really need. Do not blindly pursue high pixel high resolution, such as black and white CCD for fluorescence shooting, the general pixel can be satisfied in more than 1 million, the pixel point is small, the sensitivity is strong, and it is in line with the weak fluorescence.
The second step: the psychological price of the CCD microscope camera
According to the amount of research funding, you can decide an affordable psychological price, such as 20,000-50,000. This can help us save a lot of time and can be more purposeful when choosing.
The third step: not necessarily bought from the microscope manufacturer
Everyone likes to buy a CCD microscope camera when buying a microscope. This is good, but it can guarantee systemicity, but sometimes it is not a way to save money. Generally, the CCD of the microscope manufacturer is matched with other manufacturers, which means that they do not produce. Or buy someone else's. This is better to find a more cost-effective CCD, first of all to ensure that the microscope is used together, and then save money, why not?
The fourth step: trial is king
Looking at the information, we can only have a perceptual understanding. Only when we actually use the machine can we have a rational understanding. At this time, the manufacturer can demonstrate it (for example: our company provides pre-sales product trials and some regional technicians on-site demonstrations, etc.), sometimes the 10 megapixel CCD microscope camera is not necessarily clear than the 5 million shots, so it is best. Try it out, the result is more assured!
Heated Tobacco Products,Heated Tobacco Vs Vaping,Heated Tobacco Device,Heated Tobacco Vs Cigarettes
KOKEN Co., Ltd , https://www.hnb-maker.com