Photodetector Drift Correction Using Reference and Background Signals
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Solution Overview
Problem
Existing methods for compensating for responsivity changes in photodetectors are complex and require additional components, failing to effectively address both detector and electronic component changes, especially in near-infrared spectroscopy applications.
Innovation Solution
A method involving determining a correction function by measuring reference and background signal levels, using an evaluation unit to evaluate the relationship between these signals, allowing for compensation of responsivity changes without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If thermo-electrical cooling is used to stabilize detector temperature, then measurement precision is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent extracts the temperature stabilization function from the measurement system by using a separate reference detector that naturally tracks temperature effects. Instead of cooling the measurement detector, the system extracts temperature drift information through the reference detector and compensates for it mathematically, eliminating the need for complex thermo-electrical cooling apparatus.
Solution Approach 2:
The reference detector serves as an intermediary that indirectly measures temperature effects on the measurement detector. By monitoring the reference detector's signal (which is affected only by temperature and not by the sample), the system obtains temperature drift information that is then used to correct the measurement detector's readings, avoiding direct temperature control of the measurement path.
2Measurement precision
If temperature sensors and TEC controllers are added to monitor and stabilize detector temperature, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The reference detector performs a dual function: it serves as both a temperature reference and a compensation mechanism. The system uses the reference detector's own temperature-dependent signal changes to automatically compensate for temperature effects on the measurement detector, making the system self-regulating without external temperature control apparatus.
Solution Approach 2:
The reference detector is designed to be identical to the measurement detector, giving it universal applicability. It performs multiple functions: tracking temperature drift, providing a reference signal for compensation calculations, and enabling correction of both detector and electronic component changes. This multi-functionality eliminates the need for separate temperature sensors and control systems.
3Measurement precision
If correction methods using temperature sensors are applied, then compensation accuracy is improved, but ease of operation deteriorates due to additional components
Solution Approach 1:
The patent merges the temperature monitoring function with the optical detection function by using the reference detector to perform both tasks simultaneously. The reference detector is illuminated by a reference beam and its signal automatically reflects temperature effects, combining what would otherwise be separate measurement and temperature monitoring functions into a single integrated component.
4Measurement precision
If multiple temperature sensors are used for multipixel devices, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The reference detector serves as a universal temperature reference for the entire multipixel measurement array. A single reference detector provides temperature compensation information that is applicable to all pixels in the measurement array, eliminating the need for multiple temperature sensors and reducing system complexity while maintaining precision across the full detector array.
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 method enables efficient and simple compensation for both detector and electronic component changes, reducing measurement noise and improving accuracy by tracking and correcting responsivity variations in real-time.
Implementation Method 1
at least one array of photoconductors, wherein each photoconductor is configured for exhibiting an electrical resistance dependent on an illumination of its light-sensitive region
Implementation Method 2
thermo-electrical cooling, typically, yields technical complexity, size and power consumption
Data Source
AI summary
Disclosed herein is a method for determining at least one correction function for compensating for responsivity changes of at least one photodetector. The photodetector includes at least one photosensitive region and at least one readout electronics unit for reading out the photosensitive region. The method includes the following steps:a) determining at least one reference signal of the photodetector, wherein the photosensitive region is illuminated by optical radiation provided by at least one reference for determining the reference signal;b) determining at least one background signal level of the photodetector; andc) determining the correction function by using at least one evaluation unit.Also disclosed herein are a method for determining at least one item of information on at least one measurement object, a photodetector and a spectrometer.