Handheld Optical Radiation Meter with Spectral Mismatch Correction
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Solution Overview
Problem
Conventional handheld optical radiation meters lack accuracy and dynamic range for simultaneous irradiance and illuminance measurements, and fail to correct spectral mismatch errors, making them unsuitable for both laboratory and field use.
Innovation Solution
A handheld optical radiation meter integrating photometric and spectral measurement modules with a cosine corrector and array detector, using spectral information to correct photometric measurements and achieve wide dynamic range and high accuracy, while also allowing for chromaticity and other parameter measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional handheld illuminance meters with only photometer heads are used, then the device is portable and simple in structure, but the spectral measurement accuracy is low and V(λ) spectral mismatch error is serious
Solution Approach 1:
The patent combines a photometric measurement module and a spectral measurement module into an integrated handheld device. The photometric module includes a photometer head with cosine corrector and photoelectric sensor, while the spectral module includes a dispersion unit and array detector. Both modules share a common optical path and photo surface, enabling simultaneous photometric and spectral measurements with improved accuracy while maintaining portability.
2Ease of operation
If handheld devices are designed for portability, then the device size is small and convenient for field use, but the measurement dynamic range and accuracy are limited
Solution Approach 1:
The handheld device is designed to perform multiple measurement functions simultaneously. It can measure illuminance, irradiance, spectral power distribution, and chromaticity parameters using the same integrated optical system. The photometric and spectral measurement modules share common optical components and photo surfaces, enabling the device to handle diverse measurement tasks across a wide dynamic range while maintaining a compact portable form factor.
3Measurement precision
If spectral measurement module is added to handheld device, then spectral information can be obtained for correction, but the device complexity increases
Solution Approach 1:
The patent merges the photometric and spectral measurement modules into a single integrated system with shared optical components. Both modules use the same optical path and photo surface, eliminating the need for separate independent measurement systems. The correction algorithm uses spectral power distribution data from the spectral module to adjust photometric measurements, achieving high accuracy without duplicating hardware components.
4Productivity
If conventional photometric measurement is used without spectral correction, then the device is simple and fast, but the V(λ) spectral mismatch error cannot be corrected
Solution Approach 1:
The patent implements a feedback correction mechanism where the spectral measurement module continuously provides spectral power distribution data that is used to calculate correction factors for the photometric measurements. The correction algorithm compares the actual spectral content with the standard V(λ) luminous efficiency function and adjusts the illuminance and irradiance readings accordingly, maintaining measurement speed while eliminating spectral mismatch errors.
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 solution enables accurate and concurrent measurement of irradiance, illuminance, and chromaticity with a wide linear dynamic range, effectively correcting spectral mismatch errors and improving measurement accuracy, making it suitable for both laboratory and field applications.
Implementation Method 1
the photometric measurement module includes a cosine corrector, a spectral response correction unit and a photoelectric sensor
Implementation Method 2
the spectral measurement module includes a dispersion unit and an array detector
Data Source
AI summary
The present invention discloses a handheld optical radiation meter and a correction method thereof. The handheld optical radiation meter has a photometric measurement module, a spectral measurement module and a screen. The spectral quantities of the spectral measurement module are employed to correct the spectral mismatch error of the photometric measurement module. With simple configuration, the present invention can realize high accuracy photometry and chromaticity measurement within a wide-span dynamic range, and has the characteristics of complete test functions, high measurement accuracy, convenient operation, low cost, etc.