Satellite Photosensor Filter for Sunlight Protection
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Solution Overview
Problem
Existing methods for protecting optical sensors on satellites from strong sunlight often require additional fuel and cost due to evasive maneuvering, which can be inefficient and affect the satellite's lifespan.
Innovation Solution
A filtering method and device that uses a smart window or polarized light filter in the optical sensor's tube, controlled by a voltage signal to adjust transmittance and prevent excessive light from reaching the sensor, combined with evasive maneuvering only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If evasive maneuvering is used to protect optical sensor from strong sunlight, then the optical sensor is protected from damage, but additional fuel consumption occurs and satellite lifespan is reduced
Solution Approach 1:
A filter is introduced as an intermediary component between the optical sensor and the external environment. This filter selectively blocks harmful sunlight while allowing the sensor to remain in its original position, eliminating the need for fuel-consuming evasive maneuvers and preserving satellite lifespan.
Solution Approach 2:
The mechanical evasive maneuvering system is replaced with a passive optical filter system. Instead of using thrusters to physically move the satellite away from sunlight, a filter optically blocks the harmful radiation, substituting a mechanical protection method with a more efficient optical solution.
2Reliability
If evasive maneuvering is performed to avoid strong sunlight, then the optical sensor is protected, but additional costs are required
Solution Approach 1:
A filter is introduced as an intermediary component between the optical sensor and the external environment. This filter selectively blocks harmful sunlight while allowing the sensor to remain in its original position, eliminating the need for fuel-consuming evasive maneuvers and preserving satellite lifespan.
3Illumination intensity
If the filter transmittance is increased to allow more light, then the sensor receives sufficient light for operation, but the sensor becomes vulnerable to damage from strong sunlight
Solution Approach 1:
The filter exhibits different optical properties for different wavelengths of light. It is designed to have high transmittance for visible light wavelengths needed for sensor operation, while simultaneously having high absorption for ultraviolet and infrared wavelengths that cause damage, achieving both illumination and protection requirements.
Solution Approach 2:
The filter's transmittance characteristics are optimized by changing its material composition and structural parameters. By adjusting the filter's optical parameters, it achieves the desired balance between allowing sufficient operational light while blocking harmful radiation intensities.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces the intensity of strong sunlight reaching the optical sensor, extending its operational life and reducing fuel consumption and costs by selectively using the filter or evasive maneuvers based on light intensity.
Implementation Method 1
a filter that controls a transmittance... effectively reduces the intensity of strong sunlight reaching the optical sensor
Implementation Method 2
uses a smart window or polarized light filter in the optical sensor's tube, controlled by a voltage signal to adjust transmittance
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
Provided is a satellite comprising a filtering unit for preventing damage to a photosensor by controlling the transmissivity of light inputted into the photosensor. The satellite can comprise: a photosensor for acquiring data associated with the satellite by using the light transmitted to the satellite; a communication unit for receiving, from a control center of the satellite, a first command signal for controlling the intensity of the light; and a filtering unit for controlling the transmissivity of the light according to the first command signal so as to prevent damage to the photosensor.