Spectral photoradiometer Photo Research technical principles and introduction

Photo Research series spectral photoratrophotometer technology principle and introduction

Brief introduction

Founded in 1941 and located in North Syracuse, Rochester, New York, The United States Photo Researc is a world-renowned company specializing in the research and production of luminosity, color, and radioactivity measuring instruments; At the same time, PR is also the world's first manufacturer of spectral photometers, with 13 independent optical calibration laboratories around the world, traceable NIST (National Bureau of Metrology) calibration standards; As a first-class agent of Photo Research in China, Aunion Is headquartered in Shanghai and has established offices in Xi'an and Chengdu to provide fast local calibration and maintenance services

First, the introduction of theory

The PR-6 series and PR-7 series are spectral radiometers in the true sense of the word; Effectively collect optical radiation signals (optical signals)

Figure 1 PR-788 spectral measurement range

For the PR-655, PR-670, and PR-788 the measured wavelength range is 380 nanometers (nm) (violet) to 780 nm (dark red) – the visible spectral band of electromagnetic waves (see Figure 1

Diffraction spectra reach the ccd detector; The PR-655 detector is a 128-bit linear detector, the PR-670 detector is a 256-bit linear detector, and the PR-788 detector is a 512-bit linear detector; Each detector unit represents a different color

When measuring, the radiated light is sampled and measured at a specific time by an adaptive sensitivity algorithm, and the auto-adaptation sensor automatically determines the appropriate exposure time

Figure 2 Simplified block diagram

Figure 3 PR series photometer optical path diagram

The instrument is factory calibrated with the spectral data by the corresponding calibration coefficients, including wavelength accuracy correction, spectral distribution correction, and photometric correction

Next, these data can be calibrated with spectral calibration coefficients; These calibration coefficients ensure that the spectral energy distribution (SPD) of interest measured and the resulting data such as CIE chromaticity values are correctly traced

Important parameter calculation formula

The corrected spectral data is used to calculate photometric and chromaticity values including luminance, color coordinates of CIE 1931 x, y, and 1976 u', v', correlated color temperature (CCT), and dominant wavelength

Figure 4 CIE 1931 Tristimulus function

CIE XYZ triples stimulus values and luminosity

Y can also represent the photometric value - when using a standard MS-75 lens, Y gives cd /m²- international brightness

683 is a constant that converts lumens into watts

= The corrected spectral data,
which is the CIE tristimulus function curve,is the spectral increment, for PR-655 the increment is 4 nm, the increment of PR-670

is 2nm, and the increment of PR-788 is 1nm
.

After obtaining the expression of these three tristimulus values, useful chroma values such as CIE 1931 x, y, and 1976 u, v" can be calculated by the following formula:

Spectroscopic photometer: relatively slow but high precision, suitable for LCD \OLED\Mini-LED\Micro-LED\silicon-based OLED research and development and other fields;

Filter type photometer: fast, but poor accuracy, suitable for backlight modules, line Flicker and response time testing
.

2.
Spectroradiometer spectrophotometer

SpectraScan® spectrophotometrometer is a high-end professional instrument for measuring emissivity.
Patented Pritchard viewfinder
.
Their ease of use, high accuracy and reliability make this range of products most widely used in the measurement
of light.

PR-655: Versatile, extremely cost-effective, rich in accessories

PR-670: Automatic multi-diaphragm and automatic shutter, micro-region measurement

PR-680(L): Set of spectral and filter type in one, one machine multi-purpose

PR-740/745: Cooled linear array detector with ultra-low brightness and ultra-short time (minimum 200ms) measurements, the most sensitive
in its class.
The PR-745 spectral range extends to 380-1080 nm

R-788 wide dynamic range spectrophotometer, based on the ultra-sensitive PR74X series spectral test system and is currently used in R&D, QC, QA and factory production;

With an industry-leading dynamic range of 1,000,000:1, it provides a solution that can be output from black to all-white test equipment without having to add external attenuation or change geometric optics (e.
g.
measuring site size), which is the highest speed available on the market;

In particular, the TEST PR-788 for OLED screens meets the needs of dark states and ultra-high sensitivity!

Wider dynamic range:

Test display/backlighting does not require the addition of external filtering or changing the diaphragm;

Variable spectral bandwidth:

Spectral resolution can meet the display technology of LCD and even laser projectors;

Brightness test in extremely dark states:

0.
000,034-6,850,000 cd/㎡

High-speed cycle time:

Testing/calibration shows a sharp reduction in the total time of the product;

USB, RS232, Bluetooth interface:

Easy integration into automated test environments (ATEs)

PR-730/740/735/745 Technical Specifications

PR-788 Specifications

Diaphragm & corresponding spot size

PR-788 brightness range

Three.
apply

Spectroscopic photometers are widely used
in the panel display and lighting industries.
Important can measure luminance, chromaticity, luminance uniformity, chromaticity uniformity, gamma values, and the transmittance and reflectivity of certain optical materials for applications
such as.
It can also be used as a standard to correct machine aberrations and correct imaging photometer parameters
.
Not only for scientific research, but also for
luminance and color measurement solutions in factories.

Fourth, Photo Research photometer series product overview:

PR-655 CCD Detector 128-bit Linear TEC Cooling Band: 380-780nm Bandwidth: 8nm Brightness Range: 0.
68-102,774nits

PR-670 CCD Detector 256-Bit Linear TEC Cooling Band: 380-780nm Bandwidth: 8nm Brightness Range: 0.
034-8,565,000nits

PR-680 CCD/PMT Dual Detector 256-bit Linear TEC Refrigeration/Photomultiplier Tube Band: 380-780nm Brightness Range: 0.
003-17,000,000nits

PR-788 CCD Detector 512-bit Linear TEC Cooling Band: 380-780nm Bandwidth: 5nm Brightness Range: 0.
000034-6,850,000nits

PR-730/740 CCD Detector 512-bit Linear TEC Cooling Band: 380-780nm Bandwidth: 2,5 or 8nm Brightness Range (PR-730): 0.
00034-19,000,000nits; Brightness range (PR-740): 0.
000034-680,000nits

PR-735/745 CCD Detector 512-bit Linear TEC Cooling Band: 380-1080nm Bandwidth: 14nm

If you are interested in Photo Research spectrophotometers, please check the official website of Haoliang:contact us
by phone, email, WeChat.

About Haoliang Optoelectronics:

Shanghai Haoliang Optoelectronic Equipment Co.
, Ltd.
is a professional agent of optoelectronic products, including various types of lasers, photoelectric modulators, optical measuring equipment, optical components, etc.
, involving applications covering material processing, optical communications, biomedical, scientific research, national defense, quantum optics, biological microscopy, IoT sensing, laser manufacturing, etc.
; Can provide customers with complete equipment installation, training, hardware development, software development, system integration and other services
.

You can www.
auniontech.
com more product information through our official website of Haoliang Optoelectronics, or call us directly at 4006-888-532
.