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Home > Applications > Farm to Table Technologies > Agricultural Measurements and Monitoring

Agricultural Measurements and Monitoring

Wine Analysis in the Lab

In agricultural environments, plants and crops exhibit UV-VIS, NIR and color characteristics of interest to researchers, whose goal is to improve yield, quality and other characteristics. Ocean Optics spectrometers and accessories are compact, robust and easily configured for the field or research lab for immediate, in situ analysis. The data captured can have enormous value in identifying areas for sample improvement.

Our miniature spectrometers have been configured for a wide range of agricultural sample measurements including photosynthesis in leaves, upwelling and downwelling measurements in relation to crop health, and color as an indicator of fruit maturation.


Featured:

Jaz Field Spectrometer

Jaz Field Spectrometer

Its built-in computing power, battery and display make Jaz ideal for field applications.

Example Setup: NIR Reflection

Overview

Spectral reflectance measurements can provide information about sample colors and textures. Also, reflectance can reveal compositional information about the sample material, since light that is not reflected from a sample is absorbed due to its chemical composition, scattered or transmitted.

Very smooth surfaces have high specular reflection, which means all the incident light is reflected in the same direction (angle of reflection = angle of incidence). Rough or matte surfaces have diffuse reflection, which means the incident light gets scattered in all directions. Most surfaces are in-between, with a combination of specular and diffuse reflectance.

Spectrometer

Our NIRQuest spectrometers are a good choice for NIR reflection, with both 512-element and 256-element InGaAs array options available covering various ranges from ~900-2500 nm. In this setup we’ve selected a NIRQuest256-2.1 (900-2050 nm) with a 25 µm slit. An optional order-sorting filter (OF1-RG830, transmits >830 nm) is also available.

Sampling Optics

A reflection probe is great for making quick measurements and for applications where a small spot size needs to be sampled, and can measure either specular or diffuse reflectance. The downside is that a reflection probe illuminates and detects from the same direction, so it sees only part of the reflected light. Measurements made with a reflection probe are relative measurements.

The illustration here shows a 400 µm reflection probe (QR400-7-VIS-NIR) and the RPH-1 probe holder. The holder positions the probe at either 45° for diffuse reflection or 90° for specular reflection. For curved surfaces, we recommend substituting one of our CSH holders for the RPH-1.

There are alternatives to a reflection probe for sampling. An integrating sphere like the FOIS-1 is recommended if the reflectivity of the sample appears different when the angle at which it is illuminated is varied. This occurs for rough surfaces like fish scales, grains and seeds. For samples where a very high intensity light source is required, the combination Vivo light source-diffuse reflection stage is a good option.

For illumination, we used the HL-2000-HP-FHSA high-power tungsten halogen light source (360-2400 nm). The powerful light output (20 W versus 5 W for the standard source) is especially important for NIR measurements. To complete the setup, we added a WS-1-SL reflectance standard as a reference and OceanView spectroscopy software.

NIRQuest256-2.1 NIR spectrometer (900-2050 nm) with Grating NIR2 (900-2100 nm) and a 25 µm slit
HL-2000-HP-FHSA High-power tungsten halogen light source (360-2400 nm) with filter holder, shutter and attenuator
QR400-7-VIS-NIR Premium-grade reflection probe (6-around-1 fiber design), optimized for VIS-NIR response, 2 m length
RPH-1 Fixture for holding 1/4″ (6.35 mm) diameter reflection probes
WS-1-SL Diffuse reflectance standard
OceanView Spectroscopy software

Example Setup: Agricultural Measurements

Spectra-Characteristics-of-Flour-Samples

NIR analysis can be used to distinguish absorbance characteristics of water and protein molecules in various samples.

Spectra-Characteristics-of-Leaf-Samples

Spectral characteristics of leaf samples offer insight into plant health and environmental adaptability.

Spectra-NIR-Absorbance-of-Corn-Kernels

Spectral data for corn kernels reveals differences based on sampling location and other variables.

Spectra-NIR-Diffuse-Reflection-of-Mango-Samples

Fruit maturity and the effects of the peel are among the factors affecting NIR diffuse reflectance spectra of mangoes.

Spectra-NIR-Reflectance-of-Potato-Samples

For crops covered with a skin, longer wavelengths used for NIR analysis are weakly absorbed and pass through the skin to measure the flesh beneath.

Agricultural Measurements and Monitoring Agricultural Measurements and Monitoring Agricultural Measurements and Monitoring Agricultural Measurements and Monitoring Agricultural Measurements and Monitoring

Analyzing Soil Composition

In this video, NIR spectroscopy is used for quantitative determination of soil composition – one of several important criteria for farmers managing crop production.

Featured products: NIRQuest512-1.7 spectrometer (900-1700 nm); OceanView spectroscopy software

Jaz Spectrometers — The Ultimate in Field Analysis

Product Spotlight — Vivo VIS-NIR Light Source

Flame Spectrometer

Flame Spectrometer

High Thermal Stability, Interchangeable Slits
FLAME-CHEM Spectrometer Systems

FLAME-CHEM Spectrometer Systems

Compact Spectrophotometers for Educators and Lab Pros
FLAME-BUNDLE-FL

FLAME-BUNDLE-FL

Application-Ready System for Fluorescence
FLAME-NIR BUNDLE

FLAME-NIR BUNDLE

Diffuse Reflectance Package
JAZ Spectrometer

JAZ Spectrometer

Handheld Spectrometer for UV-Vis Measurements
FLAME-BUNDLE-REFLECTANCE

FLAME-BUNDLE-REFLECTANCE

Application-Ready System for Reflectance
FLAME-BUNDLE-ABS

FLAME-BUNDLE-ABS

Application-Ready System for Absorbance
Reflectance Probe

Reflectance Probe

Diffuse Reflectance Probe with Integrated Light Source
Spark-VIS

Spark-VIS

Ultra-compact Visible Spectral Sensor
Flame-NIR Spectrometer

Flame-NIR Spectrometer

Compact NIR Instrument
SERS-Substrate

SERS-Substrate

Oberflächenverstärkte Raman-Streuung
SERS Substrates

SERS Substrates

Surface Enhanced Raman Spectroscopy
RPH Reflection Probe Holders

RPH Reflection Probe Holders

Fixtures for Mounting Probes in Reflection Setups