Fundamentals of photoelectric sensor technology

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

Change. For this purpose, photoelectric sensingThe basic knowledge involved in the machine is wide, and it is necessary to master the basic theories and basic parameters of light and electricity

Knowledge of numbers. About electricityThe basic theory and basic metrics are explained very clearly in many courses and will not be discussed in this book

Theory, and the basic principles of lightThe explanation of basic measurement parameters is somewhat inadequate in comparison, and this chapter is more detailed

Investigate. In addition, this chapter alsoThe basic theoretical foundation of photoelectric conversion must be established so that readers can deeply grasp photoelectric sensing

Apparatus technology.

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

The basic determination of the thermal radiation of an objectIssues such as law, the role of light and matter are 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 reflection of light were studiedThe law of emission has obtained a lot about optical imaging and aberrations

of theories. Physical opticsAccording to the fluctuation of light, the interference and diffraction of Ding light are successfully explained

Emission and other phenomena are spectral pointsAnalysis instruments and holographic photography technology have laid a theoretical foundation.

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

qualitatively, it is both volatileIt is also material, and its essence is particles, called the amount of light

sub or photon. Photons have momentum and energy, and divideDon't mean it as

    Owner and ugly:Ap

wherehis Planck's constant(6．626 X 10OneNFourth..)；。 is the vibration frequency of light

(S”)；Cis the speed at which light travels in a vacuum(3×108m／s)。

    Light is a substance that propagates in the form of electromagnetic waves. of the electromagnetic spectrumThe frequency range is great

Wide and covers everything from cosmic rays to radio waves(1()One~lmajesticHZ)targetWide frequency

Region. As shown in the picture1—1The distribution of the electromagnetic spectrum is shown. As visible from the figure, light radiationShoot only

OnlyA small part of the electromagnetic spectrum, which includes a wavelength region from nanometers to millimeters

m, ielOOne one10”mscope. In this range, onlyO。38One

0．78tmaThe light can be seen by the human eye, and people want the photoelectric sensor to perceive  fig1—1Distribution of the electromagnetic spectrum

The range is much larger than the wavelength range visible to the human eye,Require fromXRay-to-infrared, far-infrared,7Tb(10’’Ib)wave

with the range of millimeter waves, and the requirement to be able to observe places that cannot be reached by humans(Such as particularly dangerous and particularly remoteFar away

square)。