Operation steps and principle of ultraviolet full wavelength scanning

The principle of wavelength scanning is to measure the sample in a wavelength range and reflect the absorbance value of the sample at different wavelengths. When operating, you need to set the measurement mode, that is, whether to measure T or A, then the measurement range, the measurement range of the sample, and then the scanning wavelength, and set the wavelength range that the sample needs to scan.

Secondly, there is a scanning interval, which means how many nanometers the instrument measures the sample. For example, if the scanning interval is 1 nm, the instrument will take the sample value every 1 nm from the set starting wavelength, and then connect these points to obtain the required image.

There are two scanning speeds: fast scanning and slow three scanning. This can be set as required. Of course, the slower the better. What remains is the number of scans, that is to say, the sample is scanned 1 times or more. There are two ways to overlap or overlay scanned images. When the number of scans exceeds 2, overlay only displays the last scanned image, and Overlay displays the image of each scan. After setting, the reference is placed on the optical path for baseline correction, that is, the plumpness is adjusted at each wavelength within the measured wavelength range, and then the sample is pulled to start measurement.

Extended data

Visible light application

remote sensing technology

Visible spectrum remote sensing refers to the remote sensing technology that limits the working band of the sensor to the visible band (0.38 ~ 0.76 micron).

The visible wavelength range of electromagnetic spectrum is about 0.38 ~ 0.76 micron, which is the most commonly used working band in traditional aerial photography reconnaissance and aerial photography mapping. Because the color sensitive range of photosensitive film is just within this wavelength range, black-and-white panchromatic or color images with high ground resolution and interpretation mapping performance can be obtained.

However, due to the great limitation of solar illumination conditions and the appearance of infrared photography and multi-band remote sensing, visible light remote sensing has extended its working band to the near infrared region (about 0.9 micron). The imaging mode has also developed from a single photographic imaging to include black-and-white photography, infrared photography, color photography, color infrared photography, multi-band photography and multi-band scanning, and the detection ability has been greatly improved. Visible light remote sensing space photogrammetry marked by the application of framing space camera has great development potential.

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