How an FT-IR Spectrometer Works: The Detection Principle

Both the BRT 860 and BRT 800 are based on the Michelson interferometer — the core of FT-IR technology. The working principle can be summarized in four steps:

1. Interference modulation — light emitted by the infrared source is converted into interference light by the Michelson interferometer (interference frequency modulation)
2. Sample irradiation — the interference light irradiates the sample, where molecules absorb specific infrared frequencies according to their characteristic vibrations
3. Detection — the receiver captures the interference light carrying the sample information
4. Fourier transform — computer software converts the interferogram into a spectrum via Fourier transform, producing the sample’s infrared absorption fingerprint

Because each molecule has unique vibrational frequencies, the resulting infrared spectrum acts as a molecular fingerprint for qualitative identification, quantitative analysis and material characterization — making FT-IR one of the most versatile tools in material science, biomedicine, petrochemicals, food safety and environmental monitoring.

BRT 860: The Benchtop Flagship FT-IR Spectrometer

The BRT 860 Fourier Transform Infrared Spectrometer is designed for demanding laboratory analysis, combining convenient installation, simple use and easy maintenance.

Key Technologies

• DSP-controlled electromagnetic drive Michelson interferometer with continuous dynamic adjustment — automatically optimizes system energy without manual tuning
• Three-dimensional right-angle gold-plated mirror optical compensation — permanently collimated optical path, no mechanical dynamic adjustment
• SuperTech fully digital electronic system — 24-bit, 500 kHz A/D conversion with high-speed USB interface for real-time spectral data acquisition
• Silicon carbide rod infrared light source (12 V, 24 W) with digital power supply technology for ultra-long service life
• High-sensitivity DLATGS receiver with polymer moisture-proof membrane
• KBr substrate multi-layer germanium-plated beam splitter — ZnSe and KRS-5 optional; windows, detector and beam splitter coated with special anti-moisture coatings
• Industrial-grade temperature and humidity module — real-time digital display with humidity alarm to protect core components from deliquescence
• Totally sealed cavity with 304 stainless steel desiccant box (tool-free replacement) and push-pull sample chamber door to minimize water and CO₂ interference
• Expansion capability — transmission, ATR, diffuse reflection and plane reflection accessories
• ~220,000-entry spectrum library — national pharmacopoeia, veterinary pharmacopoeia, rubber, gas, polymer, protein and amino acid, judicial (dangerous goods, chemicals, drugs), inorganic, organic, solvent, food additive, essence and paint libraries

BRT 860 Specifications

BRT 800: The Portable FT-IR Spectrometer for Field and QC Applications

The BRT 800 Fourier Transform Infrared Spectrometer is a portable infrared spectrometer featuring a compact, high-quality, cost-effective design with versatile portability. Its comprehensive accessory recognition system, unique measurement modules and plug-and-play interface eliminate calibration requirements.

Key Technologies

• Portable and shock-resistant — compact design for laboratory, vehicle-mounted and on-site use; fits in fume hoods and instrument cabinets
• Modular EASY test system — measurement modules and accessories auto-recognized and operated without calibration, with quick replacement in seconds
• Permanently collimated interferometer — stereoscopic balanced oscillating dual-angle gold-plated mirror with aviation-grade frictionless bearings; excellent anti-vibration and anti-thermal performance
• Solid-state laser with TEC temperature control — superior wavenumber accuracy and repeatability
• Long-life components — interferometer ≥ 10 years, air-cooled ceramic light source ≥ 8 years (automatic sleep function), standalone ATR module 10 years
• All-aluminum metal housing — full protection against electromagnetic interference
• ZnSe beam splitters and windows — designed for field and industrial applications to prevent moisture-induced degradation
• High-sensitivity DTGS detector — operates at ambient temperature without liquid nitrogen; optional semiconductor-cooled MCT detector
• QC and identification software — built-in quality control evaluation functions and automatic spectral database search for unknown sample identification
• Validation-ready — supports DQ, IQ, OQ and PQ validation with full procedure documentation

BRT 800 Specifications

BRT 860 vs BRT 800: Choosing the Right FT-IR Spectrometer

Applications Across Industries

BRT 860 serves as a necessary laboratory analysis instrument for colleges, universities and research institutes, and is widely used in material science, biomedicine, petrochemical and food safety industries.

BRT 800 excels in on-site and mobile scenarios:

• Environmental monitoring — real-time flue gas detection of H₂O, NOₓ (NO₂, NO, N₂O), HF, SO₂, CO, HCl, NH₃ and CO₂; emergency response to pollution incidents
• Occupational health and process analysis — on-site monitoring and catalytic conversion research
• Public security, explosion-proof and drug control — identification of explosives (black powder, ammonium nitrate, TNT, RDX, HMX) and drugs (morphine, heroin, methamphetamine, cocaine, new synthetic drugs)
• Pharmaceuticals, food and petrochemicals — quality control and sample identification
• Lubricating oil analysis — authenticity verification and manufacturer differentiation
• Jewelry and gemstones — classification and authentication

Why Choose Shenyang Baoruitong FT-IR Spectrometers

• Proven Michelson interferometer technology — DSP electromagnetic drive (BRT 860) and permanently collimated dual-angle mirror design (BRT 800)
• High performance — 7800–350 cm⁻¹ spectral range, resolution better than 1 cm⁻¹, SNR 30,000:1, wavenumber accuracy better than 0.01 cm⁻¹
• Industry-grade moisture protection — sealed cavities, humidity alarms and moisture-proof optics extend component service life
• Extensive spectral libraries — up to ~220,000 reference spectra for confident identification
• One-year warranty service period — professional after-sales support, calibration guidance and technical consultation included

About Shenyang Baoruitong Automation Equipment Co., Ltd.

Shenyang Baoruitong Automation Equipment Co., Ltd. was founded in 2012 and is located in Shenyang, a key city in Northeast China’s historic industrial base, well known for equipment manufacturing. With a registered capital of RMB 5 million, the company is a technology-oriented enterprise specializing in the research and development, production, sales and service of testing and inspection equipment. Supported by professional pre-sales and after-sales teams, Baoruitong provides customers with reliable technical support and service. Every instrument is backed by a one-year warranty service period.

For more information about the BRT 860 and BRT 800 FT-IR spectrometers, pricing or a quotation, please contact our sales team or visit our website.

FAQ

Q1: How does an FT-IR spectrometer work? An FT-IR spectrometer uses a Michelson interferometer to convert infrared light into interference light, irradiates the sample, detects the interference pattern, and applies a Fourier transform to produce the sample’s infrared absorption spectrum.

Q2: What is the difference between the BRT 860 and BRT 800? The BRT 860 is a benchtop laboratory spectrometer (14 kg, USB interface, DSP-driven interferometer) for research and routine analysis, while the BRT 800 is a portable instrument (7 kg, Ethernet, permanently collimated modular interferometer) for field, gas detection and on-site QC applications.

Q3: What is the spectral range and resolution of the BRT series? Both the BRT 860 and BRT 800 cover 7800–350 cm⁻¹ with wavenumber accuracy better than 0.01 cm⁻¹. Resolution is better than 1 cm⁻¹ (BRT 860) and better than 0.85 cm⁻¹ (BRT 800).

Q4: What accessories are available for the BRT spectrometers? Both instruments support transmission, ATR (including ZnSe and diamond crystals), diffuse reflection and plane reflection accessories; the BRT 800 adds wireless transmission, removable battery, vehicle battery and sealed transfer container options.

Q5: What warranty does Shenyang Baoruitong provide? Every Baoruitong FT-IR spectrometer is covered by a one-year warranty service period, including professional after-sales support, calibration guidance and technical consultation.