Advanced Tunable Diode Laser Absorption Spectroscopy (TDLAS)

Highly accurate, fast-response gas measurement systems tailored for industrial and environmental monitoring applications.

Overview

Tunable Diode Laser Absorption Spectroscopy (TDLAS) is a highly selective and sensitive method for real-time gas measurement. This non-contact, optical sensing technology leverages the specific absorption features of gases in the near-infrared spectrum, enabling precise quantification of individual gas components—even in harsh or complex process environments. TDLAS is widely utilized across process industries, environmental monitoring, and emission control due to its fast response time, zero cross-interference, and low maintenance requirements. The technology supports continuous monitoring of gases like ammonia (NH₃), methane (CH₄), hydrochloric acid (HCl), and water vapor (H₂O), among others.

As a growing B2B provider across North America, Emissions and Stack integrates advanced TDLAS systems into scalable solutions. Our customers benefit from performance-backed products that meet rigorous industrial and environmental standards. We help businesses enhance compliance, operational efficiency, and data-driven decision-making through expert service and dependable technology.

Core Components of TDLAS Systems

In addition to offering products and systems developed by our team and trusted partners for Tunable Diode Laser Absorption Spectroscopy (TDLAS), we are proud to carry top-tier technologies from Global Advanced Operations Tek Inc. (GAO Tek Inc.) and Global Advanced Operations RFID Inc. (GAO RFID Inc.).
These reliable, high-quality products and systems enhance our ability to deliver comprehensive technologies, integrations, and services you can trust. Where relevant, we have provided direct links to select products and systems from GAO Tek Inc. and GAO RFID Inc.

Hardware

Diode Laser Source – Narrow-linewidth lasers tuned to specific absorption lines of target gases.
Optical Path System – Open-path, in-situ, or extractive configurations using multi pass cells or fiber optics.
Detectors – High-speed infrared detectors with low noise for high-resolution absorption measurements.
Enclosures & Probes – Industrial-grade, explosion-proof designs available for harsh environments.
Data Interfaces – Modular I/O for analog, Modbus, Profibus, and Ethernet connectivity.

Software

Data Acquisition & Processing – Real-time waveform acquisition, peak fitting, and calibration.
Diagnostics & Alerts – Built-in algorithms for laser aging, beam alignment, drift correction, and fault detection.
User Interface – Intuitive control panels with trend visualizations, reporting tools, and system health indicators.

Cloud Services

Remote Monitoring – Secure cloud dashboards for live access to emissions and process metrics.
Predictive Maintenance – AI-driven tools to forecast sensor health and maintenance windows.
Data Archiving – Long-term storage with audit trails for regulatory compliance.

Key Features and Functionalities

Near-zero cross-sensitivity to interfering gases
Fast response time (sub-second measurements)
High selectivity and accuracy (ppm to ppb levels)
In-situ and extractive configurations
Built-in diagnostics and auto-calibration
Minimal consumables and low operational costs.

Integrations

Industrial DCS and SCADA systems
Environmental Data Acquisition Systems (EDAS)
PLCs with Modbus, OPC-UA, and Ethernet/IP support
Existing CEMS or air quality systems

Compatibility

Works with stack monitoring systems for power plants, refineries, and cement kilns
Integrates with clean room HVAC systems for pharmaceutical and semiconductor industries
Compatible with both legacy systems and next-gen IoT platforms

Benefits

Helps ensure regulatory compliance with minimal downtime
Provides actionable insights into combustion efficiency and process optimization
Reduces maintenance frequency through solid-state, non-contact measurement
Enables early detection of leaks and process deviations
Offers remote visibility and trend analysis to support decision-making.

Applications

Stack emission monitoring
Ammonia slip detection in SCR/DeNOx systems
Combustion control and fuel gas monitoring
Process gas control in petrochemical and refining
Greenhouse gas monitoring (CH₄, CO₂)
HCl and HF detection in waste incineration

Industries Served

Power generation (coal, gas, biomass)
Oil & gas (refining, LNG, upstream/downstream)
Chemicals and petrochemicals
Cement and glass manufacturing
Waste-to-energy and incineration
Pulp and paper
Semiconductor and electronics

Relevant U.S. & Canadian Industry Standards

U.S. EPA 40 CFR Part 60 (PS-18)
U.S. EPA 40 CFR Part 75
ASTM D7459
Canadian Environmental Protection Act (CEPA)
CSA C22.2 No. 61010-1-12
NIST traceable calibration standards

Case Studies

U.S. Case Study - Power Plant Ammonia Slip Monitoring – Texas

A large utility operator in Texas implemented our TDLAS system for continuous ammonia slip monitoring post-SCR unit. The solution replaced aging wet-chem analyzers and reduced maintenance costs by 38%. Real-time measurements improved feedback loop control and ensured compliance with NOx regulations.

U.S. Case Study - Petrochemical HCl Detection – Louisiana

A major refinery in Louisiana integrated our TDLAS-based analyzer for detecting HCl in stack emissions. The fast response time (under 1s) helped prevent corrosion in downstream equipment and ensured accurate emissions reporting. The plant reported a 95% improvement in detection reliability compared to traditional FTIR.

Canadian Case Study -Waste Incinerator Compliance Monitoring – Ontario

An Ontario-based municipal waste incineration facility installed our TDLAS solution for monitoring multiple gases including HF and HCl. The system achieved compliance with CEPA regulations and eliminated the need for frequent recalibration. Real-time data uploads to cloud dashboards streamlined environmental audits and reporting.

Please Reach out to Us

For more information about TDLAS systems, technical assistance, or integration guidance.