Laser Ranging Device Sealing Cavity Condensation Prevention
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Solution Overview
Problem
Laser ranging devices face performance degradation due to water vapor condensation on the light-transmitting sheet, which affects detection accuracy, especially in extreme environments.
Innovation Solution
The device incorporates separate sealing cavities around the emission and receiving optical elements, using enclosing members to isolate water vapor and prevent condensation, thereby maintaining a low vapor volume and reducing condensation on the light-transmitting sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the accommodating cavity is used to house all components, then the device structure is simple, but water vapor condensation occurs on the light-transmitting sheet affecting detection performance
Solution Approach 1:
The patent divides the accommodating cavity into two independent parts: a sealed cavity housing the optical elements (lens and optical axis) and an unsealed cavity for other components. The sealed cavity is hermetically sealed to isolate water vapor from the light-transmitting sheet, preventing condensation while maintaining overall device functionality. This segmentation resolves the contradiction by creating a localized protected environment without completely redesigning the entire device structure.
2Reliability
If the entire accommodating cavity is sealed, then condensation is prevented, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies sealing only to the specific region where condensation would affect performance (the sealed cavity containing optical elements and light-transmitting sheet), rather than sealing the entire accommodating cavity. This localized sealing approach prevents condensation in critical areas while keeping the rest of the device structure simple and easy to manufacture, resolving the contradiction between reliability and device complexity.
3Volume of stationary object
If the sealed cavity volume is large, then more space is available for optical elements, but water vapor inside can still condense on the light-transmitting sheet
Solution Approach 1:
The patent changes the parameter of water vapor concentration inside the sealed cavity by hermetically sealing it, preventing external water vapor from entering. Additionally, the sealed cavity is designed with minimal necessary volume to contain only the optical elements and light-transmitting sheet, reducing the total amount of water vapor present. This combination of parameter changes (sealing to prevent vapor entry and minimizing volume) prevents condensation while providing adequate space for optical components.
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 solution effectively prevents water vapor condensation on the light-transmitting sheet, enhancing the laser ranging device's performance even in extreme conditions by maintaining a low vapor volume within the sealing cavities, thus improving detection accuracy.
Implementation Method 1
The first enclosing member is arranged between a first optical element and the light-transmitting sheet, has one end hermetically connected to the light-transmitting sheet, and has the other end hermetically connected to the first optical element to enclose and form a first sealing cavity
Implementation Method 2
The second enclosing member is provided between a second optical element and the light-transmitting sheet, has one end hermetically connected to the light-transmitting sheet, and has the other end hermetically connected to the second optical element to enclose and form a second sealing cavity
Data Source
AI summary
This application discloses a laser ranging device, including a housing, a light-transmitting sheet, at least one laser emission module, and at least one laser receiving module; the laser emission module includes a laser and an emission lens module; the emission lens module includes at least one emission optical element; the laser receiving module includes a laser detector and a receiving lens module; the receiving lens module includes at least one receiving optical element; the laser receiving module also includes a first enclosing member; and the first enclosing member is arranged between a first optical element and the light-transmitting sheet to enclose and form a first sealing cavity between the light-transmitting sheet and the first optical element; or the second enclosing member is arranged between a second optical element and the light-transmitting sheet to enclose and form a second sealed cavity between the light-transmitting sheet and the second optical element.