Related Experiment Video
Updated: Jan 4, 2026
10:42
Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
Published on: March 22, 2019
6.5K
Improved algorithm for expanding the measurement linear range of a four-quadrant detector.
Applied Optics
|November 2, 2019
Summary
An improved algorithm enhances the measurement accuracy and range of four-quadrant detectors for light incident angle detection. This new method maintains robustness against noise, outperforming classical and logarithmic algorithms.
Area of Science:
- Optical Engineering
- Photodetector Technology
Background:
- Four-quadrant detectors measure light incident angles but face limitations in large fields of view (FOV).
- Existing hardware and calculation principles restrict their measurement linear range and accuracy.
Purpose of the Study:
- To develop an improved algorithm for four-quadrant detectors.
- To extend the measurement linear range and enhance accuracy without compromising performance.
Main Methods:
- An improved algorithm was proposed and compared against classical and logarithmic algorithms.
- Simulations and experiments were conducted to validate the algorithm's performance.
Main Results:
- The improved algorithm demonstrated over 50% increase in measurement accuracy within the same FOV.
- The measurable range expanded by over 25% under the same accuracy requirements.
- Noise robustness was maintained, with a root mean square error of 0.1° comparable to the classical algorithm.
Conclusions:
- The improved algorithm significantly enhances accuracy and extends the measurable range of four-quadrant detectors.
- It offers superior performance compared to classical, logarithmic, and other tested algorithms, especially in large FOV applications.
- The algorithm exhibits excellent stability and effectively mitigates cross-axis interference.
Related Concept Videos
01:19Mass Analyzers: Common Types
1.3K
The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
1.3K
01:12Adjusting a Traverse
334
In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...
334
01:10Design Example: Measuring Distance Between Two Points with Obstructions
352
When measuring distances in areas with physical obstructions, such as a lake in a field, surveyors must employ techniques to calculate accurate lengths without direct line measurements. One effective method is the offset technique, which allows for precise distance estimation over inaccessible stretches.In this scenario, a surveyor must measure a side of an area that crosses a lake. Since the measuring tape cannot span the lake, the surveyor begins by establishing a baseline that aligns with...
352
01:15Distance Corrections
244
To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...
244
01:24Area Computation by the Alternative Coordinate Method
500
The alternative coordinate method, also known as the Shoelace Formula, is a technique for determining the area of a traverse using Cartesian coordinates. This method relies on the sequential arrangement of x and y coordinates for each point of the shape, ensuring accuracy and ease of application.In this approach, each corner's x and y coordinates are listed as fractions, with the x-coordinate as the numerator and the y-coordinate as the denominator. These coordinates are arranged sequentially...
500
01:13Mass Analyzers: Overview
1.5K
The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...
1.5K