What are the disadvantages and advantages of optical calibration board in aerospace applications

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Optical path restrictions:

In aerospace applications, due to the design and space constraints of spacecraft, the optical calibration board can usually only be located in a specific position of the optical path of the remote sensor, which makes it can only calibrate part of the optical path.

This limitation may lead to the calibration coefficient can not truly reflect the change of the whole optical path system, thus introducing uncertainty and affecting the accuracy of the calibration.

Light source stability problem:

If a standard lamp is used as a light source for calibration, the irradiance of the standard lamp may decay with increasing working time, and this attenuation may not be accurately predicted and corrected.

This will directly affect the accuracy of calibration on long-term stars, making the calibration results unreliable.

Spectral matching error:

The spectrum of a standard lamp is usually significantly different from that of the sun.

In the calibration based on the "standard lamp + diffuse reflector" system, this spectral difference can lead to spectral matching errors, further increasing the uncertainty of the calibration results.

advantage

High precision:

The optical calibration board is precisely designed and manufactured to provide high precision and stability.

It can provide accurate geometric and dimensional information to help space remote sensors achieve high-precision radiometric calibration and geometric correction.

Flexibility:

The optical calibration board can be customized according to different application requirements, including pattern, size, material and so on.

This flexibility enables the optical calibration board to adapt to the calibration requirements of various space remote sensors and meet different application scenarios.

Widely used:

Optical calibration board has wide application prospect in aerospace field.

It can be used not only for radiometric calibration and geometric correction of remote sensors, but also for imaging quality evaluation of optical instruments, lenses and optical components.

In summary, the optical calibration board has the advantages of high precision, flexibility and wide application in aerospace applications, but it also has drawbacks such as optical path limitation, light source stability problems and spectral matching errors. In order to overcome these disadvantages, it is necessary to continuously improve the calibration technology and methods to improve the calibration accuracy and reliability.