Terahertz Measuring Equipment Dynamic Optical Adjustment
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Solution Overview
Problem
Conventional terahertz measuring equipment experiences a decrease in the condensation state of terahertz pulse light due to the thickness and refractive index of samples, leading to blurring and increased measurement errors, especially when comparing signals with and without samples or reference samples.
Innovation Solution
The equipment includes a position adjusting mechanism and a controlling unit that adjusts the position of optical devices in the condensing optical systems to maintain the focused state of terahertz pulse light when a sample is present, using a light path length altering unit to optimize the detection of terahertz pulse light and calculate the necessary adjustments based on the sample's thickness and refractive index.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sample is arranged in the vicinity of the condensing position of the first condensing optical system, then transmission measurement of the sample can be performed, but the condensing state of terahertz pulse light to the terahertz light detector is decreased due to the thickness and refractive index of the sample, causing blurring
Solution Approach 1:
The patent introduces a position adjusting mechanism that enables dynamic adjustment of the optical device's position on the optical axis. This dynamic adjustment compensates for the blurring effect caused by samples with different thicknesses and refractive indices, maintaining optimal condensing state throughout the measurement process.
Solution Approach 2:
The patent changes the position parameter of the optical device to compensate for the optical path differences introduced by samples. By adjusting the position of the optical device along the optical axis, the system adapts to different sample properties (thickness and refractive index) and maintains proper focusing at the detector.
2Device complexity
If the positional relationship among the terahertz light generator, optical devices, and terahertz light detector is fixed, then the equipment structure is simple, but the condensing state deteriorates when samples with different thickness and refractive index are measured
Solution Approach 1:
The patent transforms the fixed positional relationship into a dynamic adjustable one. A position adjusting mechanism is introduced that allows the optical device to be moved along the optical axis, enabling the system to adapt to different sample conditions while maintaining relatively simple equipment structure.
3Ease of operation
If no position adjustment mechanism is provided, then the equipment is simple and easy to operate, but measurement errors increase due to blurring caused by sample thickness and refractive index
Solution Approach 1:
The patent implements a controlling unit that automatically controls the position adjusting mechanism. The system self-adjusts the optical device position based on the detected blurring effect, eliminating the need for manual intervention and maintaining measurement precision without complicating operation.
Solution Approach 2:
The patent introduces a feedback control loop where the controlling unit monitors the measurement condition and automatically adjusts the optical device position through the position adjusting mechanism. This feedback system compensates for blurring effects caused by different samples, maintaining measurement precision while keeping the system easy to operate.
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 reduces measurement errors caused by the sample's thickness and refractive index, ensuring a consistent focused state and improved spectroscopic characterization by maintaining the optimal condensation state of terahertz pulse light at the detector.
Implementation Method 1
a femtosecond pulse light source 1, a beam splitter 2, a pump pulse light 12 for exciting the terahertz pulse light generator 3, a terahertz pulse light generator 3 using a photoconductive antenna
Implementation Method 2
a condensing lens 10 that condenses the terahertz pulse light L4
Implementation Method 3
a terahertz light detector 6 that detects the terahertz pulse light L5
Data Source
AI summary
A measuring equipment utilizing terahertz pulse light, includes: a terahertz light generator that generates terahertz pulse light; a terahertz light detector that detects terahertz pulse light; a first condensing optical system that condenses the terahertz pulse light generated by the terahertz light generator; and a second condensing optical system that condenses the terahertz pulse light diverging after being condensed by the first condensing optical system, onto the terahertz light detector. A sample is arranged in a vicinity of a position of condensing the terahertz pulse light by the first condensing optical system; and at least one of the first and the second condensing optical systems includes at least one optical device having a positive or negative refractive power. The measuring equipment further includes: a position adjusting mechanism that adjusts a position of the at least one optical device on an optical axis when the terahertz light detector detects the terahertz pulse light having transmitted through the sample; and a controlling unit that controls the position adjusting mechanism.