Spectrophotometer Infrared Light Control via Multi-Wavelength Segmentation
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Solution Overview
Problem
In spectrophotometers with infrared light sources, feedback control based on voltage differences can be inaccurate due to temperature characteristics of light detectors and multiple reflections or scattering of laser light, leading to deviations in the actual light amount emitted from the infrared light source from the target light amount.
Innovation Solution
A spectrophotometer design that includes an infrared light source, an interferometer, and a monitor unit with multiple light detection elements sensitive to different wavelength ranges, allowing for the derivation of a voltage difference that accurately reflects the light amount difference and temperature variations, enabling precise control of the infrared light source to reach the target light amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If feedback control is performed based on voltage difference from a single light detector, then the control system is simple, but the light amount control accuracy deteriorates due to temperature characteristics and laser light interference
Solution Approach 1:
The light detector is divided into multiple detection elements with different temperature characteristics and wavelength sensitivities. Each detection element detects light in a specific wavelength range, allowing the system to separate and independently analyze different components of the detected signal, thereby improving measurement accuracy while maintaining manageable system complexity
Solution Approach 2:
The patent introduces an intermediary calculation process that uses the voltage differences from multiple detection elements to derive the actual light amount difference. By using multiple detection elements as intermediaries, the system can eliminate the effects of temperature characteristics and laser light interference through mathematical processing, achieving accurate light amount control
2Device complexity
If a single light detector is used for monitoring, then the device structure is simple, but temperature characteristics cause voltage variations that reduce control accuracy
Solution Approach 1:
The detection system is segmented into multiple light detection elements, each with distinct temperature characteristics. This segmentation allows the system to capture different aspects of the light signal and use their combined information to compensate for temperature-induced variations, thereby improving measurement precision without significantly increasing device complexity
Solution Approach 2:
The patent changes the parameter of detection by using multiple detection elements with different temperature characteristics and wavelength sensitivities. By varying these parameters across multiple elements, the system can derive more accurate light amount information that is less sensitive to temperature fluctuations, improving control accuracy
3Reliability
If laser light is used for interferometer control, then the interferometer can be precisely controlled, but multiple reflections and scattering cause laser light to reach the light detector and interfere with measurements
Solution Approach 1:
The detection system is segmented into multiple elements with different wavelength sensitivities. This allows the system to distinguish between the laser light wavelength and the infrared light wavelength, separating the harmful laser interference from the useful measurement signal through spectral segmentation
Solution Approach 2:
The patent converts the harmful effect of laser light reaching the detector into a beneficial measurement by using multiple detection elements with different wavelength sensitivities. The laser light interference becomes additional information that, when processed through the multi-element detection system, helps derive more accurate light amount differences by providing reference data for compensation calculations
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 design improves the accuracy of light amount control by eliminating temperature and laser light interference, ensuring the infrared light source emits the desired amount, enhancing the reliability of spectrophotometric measurements.
Implementation Method 1
an infrared light source that emits light having a wavelength within an infrared range
Implementation Method 2
a first light detection element that outputs a first voltage corresponding to light having a first wavelength range and a second light detection element that outputs a second voltage corresponding to light having a second wavelength range
Data Source
AI summary
A spectrophotometer includes: an infrared light source; an interferometer; a first detector; and a monitor unit. The monitor unit includes: a second detector; and a light amount control unit. The light amount control unit is operable to control the infrared light source such that the amount comes closer to a target light amount, based on the signal. The infrared light source emits light having a first wavelength range and light having a second wavelength range different from the first wavelength range. The second detector includes: a first light detection element; and a second light detection element. The first light detection element outputs to the light amount control unit a first voltage corresponding to the light having the first wavelength range. The second light detection element outputs to the light amount control unit a second voltage corresponding to the light having the second wavelength range.