Portable Test Paper Counter Using Single Photon Detector
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Solution Overview
Problem
Manual test paper counting is time-consuming, laborious, and low in accuracy, necessitating a more efficient and accurate method.
Innovation Solution
A portable test paper counting device utilizing a single photon detector, which includes a box-shaped housing, guide rails, a laser, a reflecting mirror, and a PC computer, calculates the number of test papers based on light absorption properties using the formulae I=Nhν, I=I0e−αa(λ)d, and m=d/d0, where h, ν, I0, αa(λ), and d0 are known parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual counting method is used, then operation simplicity is maintained, but counting speed and accuracy deteriorate
Solution Approach 1:
The patent replaces the manual mechanical counting system with an optical detection system. A laser emits light that passes through the test paper stack, and a single photon detector measures the transmitted light intensity. The system uses optical principles (light absorption) instead of mechanical counting to achieve automated, high-speed, and accurate counting, directly resolving the contradiction between counting speed and device complexity
Solution Approach 2:
The patent introduces light as an intermediary between the test papers and the detection system. The laser beam serves as the medium that interacts with the test paper stack, and the single photon detector uses this light interaction to infer the number of papers. This intermediary approach enables non-contact, rapid measurement without complex mechanical handling, improving productivity while keeping the device relatively simple
2Measurement precision
If manual counting method is used, then device complexity is minimized, but measurement accuracy deteriorates
Solution Approach 1:
The patent replaces manual visual inspection with an optical measurement system. The single photon detector precisely measures the number of photons transmitted through the test paper stack, and the microcontroller calculates the paper count based on light absorption characteristics. This substitution of mechanical/visual methods with optical detection significantly improves measurement precision while maintaining relatively simple device structure
Solution Approach 2:
The patent changes the measurement parameter from visual inspection to light transmission intensity. By measuring the intensity of light transmitted through the test paper stack and using the relationship between light absorption and paper thickness/number, the system achieves high measurement precision. This parameter change enables accurate counting without complex device structure
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 enables quick, convenient, and accurate test paper counting, significantly reducing time and labor while improving accuracy, making it suitable for schools and examination institutions.
Implementation Method 1
calculates the number of test papers based on light absorption properties
Implementation Method 2
single photon detector detects a number N of the remaining photons
Data Source
AI summary
The present disclosure relates to a test paper counting technology, in particular to a portable test paper counting device and method based on a single photon detector. A portable test paper counting device based on a single photon detector is provided, which includes a box-shaped housing, two guide rail pairs, two hanger rods, a laser, a reflecting mirror, a single photon detector, a power supply, and a PC computer. A rectangular operating hole penetrating from left to right is formed in a lower edge of a right side wall of the box-shaped housing. A right part of a bottom wall of the box-shaped housing is provided with an assembly hole penetrating from up to down. A left side wall of the box-shaped housing is provided with a threading hole penetrating from left to right. Sliders of the two guide rail pairs both face downwards.