Benchtop FTIR Spectrometer with Diamond ATR

What is the Benchtop FTIR Spectrometer with Diamond ATR?

A benchtop FTIR spectrometer with diamond ATR is the general-purpose instrument for identifying solids, liquids and pastes in seconds with no sample preparation. Its 4 cm-1 resolution, 7800–350 cm-1 range and library search make it the routine choice for QC and teaching laboratories.

Overview

The benchtop FTIR uses a sealed Michelson interferometer with a KBr beam splitter and a DTGS detector, with a single-bounce diamond ATR crystal mounted on top of the sample compartment. A typical scan from 7800 to 350 cm-1 at 4 cm-1 resolution takes 10–30 seconds with 16–32 scans averaged, giving a signal-to-noise ratio above 30000:1 in one minute. A pressure clamp applies reproducible force to solid samples, and the diamond tolerates abrasive and acidic materials. Desiccated optics with indicator cartridges reduce the need for continuous purging. Software includes library search against commercial databases, multi-component quantification, spectral subtraction and user-built libraries. Fully automated performance tests verify wavenumber accuracy and energy throughput. The instrument is unsuitable for trace samples below 100 µm, where microscopes are more appropriate.

How does it work?

An FTIR spectrometer directs broadband infrared radiation from a globar or ceramic source into a Michelson interferometer, where a beam splitter divides it between a fixed mirror and a moving mirror. The recombined beam produces an interferogram that varies with mirror displacement. The interferogram passes through or reflects from the sample, is recorded by a DTGS or cooled MCT detector, and is converted to a spectrum by a Fourier transform. Multiplexing allows all frequencies to be measured simultaneously, giving the Fellgett advantage, and the circular aperture gives the Jacquinot advantage in throughput. A helium-neon laser tracks mirror position to give wavenumber accuracy of 0.01 cm-1. Sampling accessories include attenuated total reflection crystals, transmission holders, diffuse reflectance cells and gas cells, allowing solids, liquids, films and gases to be analyzed with minimal preparation.

What are the key features?

• Single-bounce diamond ATR analyzes solids, liquids and pastes without preparation.
• Sealed, desiccated interferometer reduces purge gas needs and protects KBr optics.
• Spectral range 7800–350 cm-1 with 4 cm-1 standard resolution.
• Pressure clamp delivers reproducible contact force for solid samples.
• Library search, quantification and user-built libraries in one software package.
• Automated performance verification covers wavenumber accuracy and energy throughput.

What are the technical specifications?

A typical benchtop ftir spectrometer with diamond atr configuration offers spectral range of 7800–350 cm-1, resolution of 4 cm-1 (optional 0.5 cm-1), signal-to-noise ratio of ≥30000:1 (peak to peak, 1 min, 4 cm-1), wavenumber accuracy of ≤0.01 cm-1 at 2000 cm-1, beam splitter of KBr and detector of DTGS, temperature stabilized. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Benchtop FTIR Spectrometer with Diamond ATR is used in polymer and raw material identification, incoming material QC, contaminant identification and teaching spectroscopy laboratories. Across the wider FTIR class, laboratories also deploy it for polymer and plastics identification, forensic trace evidence analysis and contaminant and failure analysis.

Which standards and certifications apply?

Relevant standards and methods include ASTM E1421, ASTM E168, ASTM E1252, ISO 10640, USP <854>, Ph. Eur. 2.2.24 and GB/T 6040. Certification candidates for this model are CE, ISO 9001 manufacturing and IEC 61010-1 safety; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Place the spectrometer on a stable, vibration-free bench with controlled humidity, since KBr optics are hygroscopic and water vapor interferes with spectra. Keep desiccant in the interferometer compartment or use a dry air or nitrogen purge. Collect a fresh background before each sample and clean the ATR crystal with isopropanol or a suitable solvent between measurements. Verify wavenumber accuracy with a polystyrene film and photometric performance with standard checks such as signal-to-noise and energy throughput. Replace the IR source and desiccant cartridges as recommended. Laser and MCT detector cooling with liquid nitrogen require trained handling. For regulated use, implement IQ/OQ/PQ and software with audit trails.

How do I select the right Benchtop FTIR Spectrometer with Diamond ATR?

Select the benchtop FTIR with diamond ATR for routine identification and QC where simplicity and throughput matter. It covers most solids, liquids and films but not trace samples or gases. In an RFQ, specify spectral range, resolution, detector, ATR crystal type, library packages and validation documentation.

How does it compare with other FTIR variants?

Choose an FTIR instrument by spectral resolution, sensitivity, sampling method and intended environment. Routine identification of polymers and organics is well served by a benchtop unit with 4 cm-1 resolution, a DTGS detector and a diamond ATR accessory. Research requiring 0.1 cm-1 resolution, step-scan time resolution or far-IR coverage needs a research-grade interferometer with optional MCT detectors. Microscopic contaminants below 50 µm require an FTIR microscope with mapping. Field identification of unknown chemicals favors a ruggedized handheld unit, and emissions or atmospheric work needs a gas analyzer with a heated multipass cell. Evaluate signal-to-noise ratio, library availability, purge requirements, accessory flexibility and software features for regulated laboratories.