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IR Spectrometers

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

Infrared (IR) Spectroscopy: Overview

Infrared (IR) Spectroscopy: Overview

When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...

Gas Chromatography: Types of Detectors-II

Gas Chromatography: Types of Detectors-II

In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...

IR Spectrum

IR Spectrum

When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0% (complete...

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...

Applications of IR Spectroscopy: Overview

Applications of IR Spectroscopy: Overview

The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...

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Related Experiment Video

Updated: Jun 26, 2026

Diffuse Reflectance Infrared Spectroscopic Identification of Dispersant/Particle Bonding Mechanisms in Functional Inks

Diffuse Reflectance Infrared Spectroscopic Identification of Dispersant/Particle Bonding Mechanisms in Functional Inks

Published on: May 8, 2015

[Target infrared detection in target spray].

Wei Deng¹, Xiong-kui He, Lu-da Zhang

¹College of Science, China Agricultural University, Beijing 100193, China. vivienne_deng@cau.edu.cn

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu

|January 7, 2009

Summary

This summary is machine-generated.

This study introduces an infrared detection system for precision agriculture, enabling automatic crop targeting and reducing chemical waste and pollution. The system effectively detects crops, optimizing targeted spraying applications.

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Diffuse Reflectance Infrared Spectroscopic Identification of Dispersant/Particle Bonding Mechanisms in Functional Inks

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Area of Science:

Agricultural Engineering
Optoelectronics
Environmental Science

Context:

Traditional agriculture and forestry practices involve discrete crop planting.
Chemical spraying between crops leads to significant waste and environmental pollution.
Precision spraying is crucial for efficient resource management and environmental protection.

Purpose:

To develop an automatic target detection method for precision spraying using infrared technology.
To overcome limitations of visible light detection, such as interference and slow response times.
To design a stable, reliable, and cost-effective photoelectric detection system for real-time applications.

Summary:

The research presents a precision spray system utilizing infrared detection technology for automatic crop target identification.
Infrared detection offers advantages like immunity to visible light interference and fast response times for non-contact detection.
A code-division infrared detection circuit with modulated pulse signals enhances system stability and interference capacity, achieving automatic crop detection at 850 nm with a tunable range of 0.1-0.5 m.

Impact:

Enables highly accurate, automated crop spraying, minimizing chemical usage and environmental impact.
Provides a robust and practical solution for on-line, real-time detection in agricultural settings.
Demonstrates the effectiveness of infrared technology in enhancing precision agriculture and sustainable farming practices.