What is the spectral response characteristic curve and what is the spectral response curve of a phot

Remote Sensing Major. Is it? I only know that in RS, the spectral responsivity of the remote sensor for different wavelengths is different, you can understand it as similar to the meaning of sensitivity, as shown in the figure below, the sensor spectral response curve refers to the horizontal axis is the wavelength vertical axis is the curve composed of responsivity, the shape is like this, different sensor curves are different, and the remote sensing try to choose the band with higher spectral responsivity for operation.

Senior undergraduates, this is a popular understanding, ** if there is a mistake, please correct it.

Spectral response refers to the relationship between the quantum efficiency of the photocathode and the incident wavelength.

The spectral response indicates the ability of photons of different wavelengths to produce electron-hole pairs. Quantitatively, the spectral response of a solar cell is the average number of carriers per photon that can be collected when a certain wavelength of light hits the surface of the cell. The spectral response of solar cells is further divided into absolute spectral response and relative spectral response.

The unit radiant light energy of various wavelengths or the corresponding photons incident on the solar cell will produce different short-circuit currents, and the corresponding short-circuit current change curve is obtained according to the distribution of wavelengths, which is called the absolute spectral response of the solar cell. If each wavelength is incident on a solar cell with a certain equal amount of radiant light energy or an equal number of photons, the short-circuit current generated is compared with the maximum short-circuit current, and its ratio change curve is obtained according to the distribution of wavelengths, which is the relative spectral response of the solar cell. However, the higher the peak and flatter the spectral response curve, the higher the short-circuit current density and the higher the efficiency of the corresponding battery, regardless of the absolute or relative spectral response.

Take a as the absorbance.

The ordinate is taken as the incident wavelength as the abscissa, and the curve is measured under the conditions of a certain temperature, concentration and liquid layer thickness, and the resulting curve is the light absorption curve. It is the basis for selecting the wavelength of the maximum absorbed incident light.

The thickness of the liquid layer and the wavelength of incident light were fixed, and the absorbance a of a series of standard solutions was determined, with a as the ordinate, and the corresponding concentration of the standard solution.

c is the abscissa, and the resulting straight line through the origin is called the standard curve.

It is a quantitative method of absorbance.

The absorption curve indicates the absorbance of the same solution to different wavelengths, and the maximum absorption wavelength can be found, which is convenient to use the maximum absorption wavelength as the absorbed light for quantification and reduce the error. However, the magnitude of the absorbance can only indicate the relative concentration of the substance, so it is necessary to draw a standard curve with a standard solution of known concentration, and the absolute concentration can be known from the absorbance of the unknown solution.

The responsivity r (and quantum efficiency) is a physical quantity that describes the photoelectric conversion capability of the device, and its magnitude is the ratio of the average output current IP of the photoelectric converter (also known as the optical detector) to the average input power PO of the photoelectric converter (also known as the optical detector), that is, the ratio of the output electrical signal current to the input optical signal power.

It is expressed by the formula as: R=IP Po, and the unit is A Under the irradiation of the optical power Po, the photocurrent generated by the tube is IP=(E*Po*) (H*F). where e is the electronic charge; h is Planck's constant; f is the frequency of incident light; is a quantum efficiency, and its value is always less than 1.

Therefore, the formula for responsivity can be written as: r= (h*f e). As can be seen from the above equation, the responsivity is related to the device material and the wavelength of the light.