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Light Measurement

Light Measurement

Ocean Optics spectrometers and accessories can be configured easily into small-footprint and portable systems for measuring the absolute or relative irradiance of radiant sources such as incandescent lights, gas-discharge lamps, flat panel displays and more. Solar irradiance measurements are also possible.

To optimize setups, users can combine their spectrometers with sampling devices including optical fibers, integrating spheres and cosine correctors. Software can be used to process data for absolute irradiance, photometry, color, peak metrics, photosynthetically active radiation and more.


Featured:

Portable Light Meter

Portable Light Meter

The Jaz-ULM-200 is spectroradiometrically calibrated for measurement of LEDs and other radiant sources.

Overview

Upwelling is radiation — either reflected solar or emitted terrestrial — that is directed upward from the Earth’s surface. Downwelling radiation is radiation that is directed toward the Earth’s surface from the sun or atmosphere. The relationship between the two (albedo) can be used to derive spectral information from vegetation, forest canopies, sea beds and more.

Spectrometer

An HR4000 Spectrometer with an HC-1 grating is one option for upwelling and downwelling measurements (a two-channel Jaz system is an alternative that offers slightly different advantages). The HC-1 is a variable-blazed grating that covers the 200-1050 nm wavelength range; optical resolution is ~1.5 nm (FWHM) with a 50 µm slit as the entrance aperture. An OFLV-200-1100 Order-sorting Filter eliminates second- and third-order effects.

Sampling Optics

The spectrometer connects to a patch cord that screws into the CC-3-UV Cosine Corrector. The CC-3-UV can be used as part of a configuration for measuring absolute spectral irradiance. You’ll need a DH2000-CAL to calibrate the absolute spectral response of the system and OceanView Spectroscopy Operating Software to calculate spectral intensity and photopic data in lumens, lux or candela. An alternative to the CC-3-UV is a Gershun tube, which has fixtures for adjusting the area of light from 1° to 28° and attaches directly to the spectrometer or to an optical fiber.

Upwelling/Downwelling System Components

The setup described here is just one option available for upwelling/downwelling measurements. For example, the previously mentioned Jaz spectrometer eliminates the need for a PC and would make it more convenient to switch from upwelling to downwelling measurements or to capture both measurements simultaneously.

Here are the items in the example setup:

HR4000 High resolution spectrometer. We recommend configuring the spectrometer with an HC-1 grating for extended range (200-1050 nm), a 50 µm slit as the entrance aperture and a DET4-200-1100 detector with variable longpass filter and quartz window
DH2000-CAL UV-NIR light source used to calibrate the absolute spectral response of a radiometric system
QP400-2-UV-VIS Premium-grade patch cord for collecting signal
CC-3-UV-S Sampling optic attaches to optical fiber to collect signal from 180° field of view
OceanView Spectrometer operating software

Example Setup - Light Measurement

Emission spectrum of a VUV lamp shows clearly defined peaks, with good SNR performance.

Emission spectrum of a VUV lamp shows clearly defined peaks, with good SNR performance.

Spectrometers are easily configured for relative irradiance measurements of visible and other light sources.

Spectrometers are easily configured for relative irradiance measurements of visible and other light sources.

Solar irradiance spectrum with identification of absorption bands of atmospheric elements.

Solar irradiance spectrum with identification of absorption bands of atmospheric elements.

Light Measurement Light Measurement Light Measurement Light Measurement
STS Developers Kit

STS Developers Kit

Connect, Code, Create with New Sensing Tools
JAZ-ULM200

JAZ-ULM200

All-in-one System for Irradiance Measurements
QE Pro-ABS

QE Pro-ABS

High-sensitivity Spectrometer for Absorbance
EMBED Spectrometer

EMBED Spectrometer

Robust, Stable Spectrometer for OEM Applications
QE Pro-FL

QE Pro-FL

High-sensitivity Spectrometer for Fluorescence
USB-TC Temperature Controller

USB-TC Temperature Controller

Increase Thermal Wavelength Stability
HL-2000-CAL Family

HL-2000-CAL Family

Vis-NIR Radiometric Calibration Sources
HL-3-CAL / HL-3plus-CAL Family

HL-3-CAL / HL-3plus-CAL Family

Vis-NIR Radiometric Calibration Sources
DH-2000-CAL Family

DH-2000-CAL Family

UV-Vis-NIR Radiometric Calibration Sources
DH-3-CAL/DH-3plus-CAL Family

DH-3-CAL/DH-3plus-CAL Family

UV-Vis-NIR Radiometric Calibration Sources
74-series Collimating Lenses

74-series Collimating Lenses

Single and Achromatic Lenses
Optical Filters

Optical Filters

OF2 Filters for High-pass, Bandpass and Balancing Requirements
INLINE-TTL Electronic Shutter

INLINE-TTL Electronic Shutter

Take Dark Measurements without Disturbing Spectrometer Setups
FOS-2X2-TTL Fiber Optic Dual Switch

FOS-2X2-TTL Fiber Optic Dual Switch

Accessory for Controlling Light in Spectrometer Setups