Rotatable Prism Turbine Blade Temperature Measurement
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Solution Overview
Problem
Current temperature measurement devices for turbine blades are inefficient and limited to single-point measurements, affecting the stability and reliability of aeroengines due to slow scanning and instability caused by the movement of probes within the optical system.
Innovation Solution
A device using a rotatable prism with a probe, prism rotating apparatus, and optical focusing apparatus, featuring a water-cooled casing, sapphire window, quartz prism, light pipe, collimating and focusing lenses, and an infrared array detector, which allows for efficient surface temperature measurement by rotating the prism and adjusting the optical system for improved scanning efficiency and multi-faceted temperature detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single-point temperature measurement method with motion scanning is used, then the measurement can be achieved, but the scanning efficiency is slow and the probe movement affects optical system stability
Solution Approach 1:
Instead of moving the probe to scan different measurement points, the invention inverts the approach by keeping the probe stationary and rotating the prism to direct light from different turbine blade facets to the fixed detector. This eliminates probe movement-induced optical instability while achieving comprehensive surface temperature measurement through prism rotation and light refraction.
Solution Approach 2:
The invention uses an array detector that simultaneously captures temperature information from multiple facets of the turbine blade, creating a comprehensive temperature map in one measurement cycle. This copying approach replaces the need for sequential single-point scanning, dramatically improving scanning efficiency while maintaining optical system stability.
2Productivity
If a single-point temperature measurement device is used, then the device structure is simple, but the measurement function is limited and scanning efficiency is low
Solution Approach 1:
The invention integrates multiple functions into a single probe system: the prism serves both as an optical element for light refraction and as a rotation mechanism for facet selection; the array detector simultaneously measures temperatures from multiple facets; the water-cooled casing provides both structural support and thermal management. This multi-functionality achieves high scanning efficiency without proportionally increasing device complexity.
Solution Approach 2:
The invention combines the light source, optical path control (prism and lenses), detection system (array detector), and cooling mechanism into an integrated probe assembly. By merging these components, the system achieves comprehensive temperature measurement capability while maintaining a compact structure that can be positioned at a single location near the turbine blade.
3Adaptability or versatility
If the probe is moved to measure different points, then comprehensive temperature measurement is achieved, but the focus and stability of the optical system inside the probe are affected
Solution Approach 1:
The invention inverts the traditional approach by keeping the optical system stationary and achieving measurement coverage through prism rotation. The prism redirects light from different turbine blade facets to the fixed array detector, eliminating focus instability caused by probe movement while maintaining comprehensive measurement capability.
Solution Approach 2:
The prism acts as an intermediary element between the stationary optical system and the turbine blade surface. By rotating the prism, different facets of the turbine blade are optically coupled to the fixed detector without requiring physical movement of the probe, thus preserving optical focus stability while achieving versatile measurement coverage.
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
The device enhances scanning efficiency, reduces optical system instability, and enables simultaneous temperature measurement of multiple facets, overcoming the limitations of traditional single-point measurement methods and improving the reliability of aeroengine maintenance.
Implementation Method 1
a water-cooled casing pipe, which comprises a water entry pipe and a water discharging pipe, is wound on the probe inner casing
Implementation Method 2
the cooling water inlet of the probe outer casing is communicated with the water entry pipe of the water-cooled casing pipe, the cooling water outlet of the probe outer casing is communicated with the water discharging pipe of the water-cooled casing pipe
Implementation Method 3
the sapphire window piece is located at a bottle mouth of the probe outer casing
Implementation Method 4
the quartz prism is configured to refract light passing through the sapphire window piece for allowing the light to accurately enter the light pipe
Implementation Method 5
the collimating lens, the focusing lens and the infrared array detector are arranged within the light pipe in sequence along a light propagation direction
Implementation Method 6
the collimating lens, the focusing lens and the infrared array detector are arranged within the light pipe in sequence along a light propagation direction
Data Source
AI summary
A device for measuring surface temperature of a turbine blade based on a rotatable prism includes a probe, a prism rotating apparatus and an optical focusing apparatus. The prism rotating apparatus and the optical focusing apparatus are located inside the probe. The probe includes a probe outer casing, a probe inner casing, a water-cooled casing pipe, a sapphire window piece, a quartz prism, a light pipe, a collimating lens, a focusing lens and an infrared array detector. The prism rotating apparatus includes a rotary motor, a worm, a gear and a prism rotary table, the rotary motor rotates to drive the prism rotary table to rotate. The optical focusing apparatus includes a telescopic motor, a coupler, a lead screw and a drive rod, the telescopic motor rotates to drive the lead screw, so as to further drive the drive rod to move along the slot.