Photoelectric sensor technology foundation

 lightThe electrical sensor not only completes the conversion between light and electrical energy, but more importantly, completes the transformation of light information and electrical information

Change. For this purpose, photoelectric sensingThe basic knowledge involved in the instrument is relatively wide, and the basic theories and basic parameters of light and electricity must be mastered

Knowledge of numbers. About electricityThe basic theories and basic measurement parameters are very clearly explained in many courses, and this book will not discuss them anymore

The basic principles of lightThe explanation of the theory and basic measurement parameters is a bit insufficient, and this chapter is more detailed

Investigate. In addition, this chapter alsoIt is necessary to establish a basic theoretical foundation for photoelectric conversion, so that readers can deeply grasp photoelectric sensing

Instrumental technology.

    rootThe chapter first discusses the basic measurement methods and units of measurement of optical radiation, and then discusses

The basic determination of the heat radiation of an objectThe role of law and the role of light and matter is photoelectric sensing

The learning of application technology lays the foundation.

    lightThe theoretical basis of electrical sensor technology is the wave-particle duality of light. Geometric optics

The refraction and reverse of light are studiedThe law of emission has obtained a lot about optical imaging and aberrations

theory. Physical optics depend onAccording to the fluctuation of light, the interference and derivation of ding light are successfully explained

Radiation and other phenomena are spectral fractionsAnalytical instruments and holographic photography technology have laid the theoretical foundation.

theyThe nature of light is described from two aspects, light is an object that vibrates at a certain frequency

It is both volatileIt is also material, and its essence is a particle, called light

The child or photon. Photons have momentum and energy, and are separatedDon't say as

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where h is the Planck constant (6.626 x 101 N D. )；。 is the vibration frequency of light

(S”)； CThe speed of light propagation in a vacuum (3×108m/s).

    Light is a substance that travels in the form of electromagnetic waves. of the electromagnetic spectrumThe frequency range is very high

Wide, covering from cosmic rays to radio waves (1() 1~l HZ).Broadband

Region. As shown in Fig. 1-1, the distribution of the electromagnetic spectrum is shown. As can be seen from the picture, the light spokesShooting only

OnlyA small part of the electromagnetic spectrum, it includes wavelength regions from nanometers to millimeters

m, i.e. lO 11110m range. In this range, there is only O. 38 a

0.78tma light can be seen by the human eye, and people hope that the photoelectric sensor will perceive the distribution of the electromagnetic spectrum in Figure 1-1

The range is much larger than the wavelength range visible to the human eye.Requires from X-ray to infrared, far infrared, 7Tb (10''Ib) waves

and millimeter wave range, and it is required to be able to observe places that are inaccessible to humans (such as particularly dangerous and particularly remote).Far away

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