Gravity-Based Light Pressure Calibration via Aluminum Film Balance
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Solution Overview
Problem
Existing methods for calibrating light pressure are complex and lack the necessary precision due to interference from conventional currents and structural complexity, making it difficult to accurately measure the small magnitude of light pressure using conventional force measuring devices.
Innovation Solution
A gravity-based light pressure calibrating device and method utilizing a vacuum chamber, high power tunable laser emitters, and laser beam expanders to create an area light source, with a calibration platform featuring a pure aluminum film and silver-coated mirrors, allowing for precise calibration by balancing the light pressure against the gravity of the film within the vacuum chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional force measuring devices are used to measure light pressure, then the measurement can be performed with simple equipment, but the measurement precision is insufficient due to the very small magnitude of light pressure
Solution Approach 1:
The patent introduces a metal film as an intermediary object with known mass and gravitational force. The light pressure is calibrated by balancing it against the precisely known gravitational force on the metal film, rather than measuring light pressure directly with a force sensor. This intermediary approach enables high-precision calibration through gravitational reference.
Solution Approach 2:
The patent replaces conventional mechanical force measuring devices with a gravity-based calibration system. Instead of using complex force sensors to measure the tiny light pressure directly, the system uses the well-known gravitational force on a metal film as a reference standard, substituting mechanical measurement with gravitational reference.
2Measurement precision
If conventional calibration methods with multiple components (shock absorption elements, optical fiber displacement sensors, capacitive displacement sensors) are used, then the measurement can be performed, but the device structure becomes very complicated
Solution Approach 1:
The patent extracts and eliminates the complex components (shock absorption elements, optical fiber displacement sensors, capacitive displacement sensors) from the calibration system. By using only a metal film with known mass in a vacuum environment, the system achieves high-precision calibration without the need for these complicated auxiliary components.
Solution Approach 2:
The patent changes the calibration approach from measuring displacement or force with multiple sensors to using the gravitational force parameter (F=mg) of a metal film as the reference standard. This parameter change simplifies the system while maintaining or improving calibration accuracy.
3Measurement precision
If thermopiles or photomultiplier tubes are used to measure light intensity and calculate light pressure, then the measurement can be performed indirectly, but the structural composition remains relatively complex and the direct measurement of light pressure is not achieved
Solution Approach 1:
The patent replaces indirect optical measurement methods (thermopiles, photomultiplier tubes) with a direct mechanical balance method. Instead of measuring light intensity and calculating pressure through P=I/c, the system directly balances light pressure against gravitational force on a metal film, achieving direct measurement with simpler structure.
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
Achieves light pressure calibration with an accuracy of 0.01 micro Newton by leveraging the precision of gravitational acceleration, eliminating interference from conventional currents and simplifying the structural complexity of previous methods.
Implementation Method 1
an object may gain kinetic energy when light directly illuminates the object that reflects according to the momentum theorem
Implementation Method 2
The light pressure calibrating device comprises a vacuum chamber, a calibration platform
Implementation Method 3
Due to gravity being accurately determined in physics, the accuracy of 0.01 Micro Newton can achieved by the value of the precision gravitational acceleration
Data Source
AI summary
A gravity-based light pressure calibrating device includes a vacuum chamber, a calibration platform, and laser emitters and laser beam expanders, laser beam expanders changing a point light source to an area light source.