Bringing Certainty to Air
Measurement .

Our Direct Optics product line is designed to address unique measurement challenges faced by customers in the air quality and emissions market.

High-Precision, Real-Time Gas Measurement for
Defensible Data

Direct Optics designs and manufactures high-precision analyzers and air sampling solutions for air emissions and air quality applications, including ambient air monitoring, regulatory, research, industrial, and defense environments. Our G60 CRDS Analyzer delivers trace-level to high pollution measurements, while our Photolytic Converter (PhoNOTM ), Automated Air Sampler, and Thermal Converters support accurate, reliable air quality monitoring. Our solutions are engineered to tackle real-world measurement challenges, providing accuracy, stability, and regulatory confidence in every reading.

Dual-Channel NO2-NOX-NO Analyzer: The Future of Gas Analysis

Our CRDS analyzer directly measures NO₂ and NOₓ simultaneously using two independent optical channels, eliminating valve switching, conversion steps, and single-detector artifacts.

This dual-channel design removes delays and non-linear response effects common to traditional NOₓ analyzers, delivering faster, more accurate measurements under real-world emission conditions. Patented self-aligning cavity mirrors ensure long-term optical stability and measurement accuracy while removing challenges typical of traditional CRDS instruments.

Direct-optics. Innovation in Air Emissions Measurement

Why Choose the Direct Optics Dual-Channel Analyzer?

  • Dual-channel technology for direct, simultaneous NO2 and NOX measurement
  • Ultra-low detection for precision
  • Wide measurement range
  • Quick interference-free NO2 /NOX readings
  • Fast response time (< 5 seconds to 90%)
  • Remote access to data
  • Customer friendly interface
  • Minimal maintenance
  • Numerous applications

PhoNOTM – Accurate NO2 Measurement Made Easy

Nitrogen dioxide (NO2) regulation is essential for public health and the environment, but inaccurate measurements are common and problematic. Analyzers using Heated Metal Converters (HMC) often overestimate NO2 levels. Our Photolytic Converter (PhoNO) is here to change that.

The Direct Optics PhoNO precisely measures NO2 concentrations and selectively separates them from other nitrates present in the air, eliminating the issue of overestimation.

Direct-optics. Innovation in Air Emissions Measurement

Why Choose the Direct Optics PhoNOTM?

  • Eliminate erroneous NO2 over-reporting

  • Interference-free NO2/NOX measurement

  • Direct replacement for molybdenum/ss converters

  • Greater than 96% conversion efficiency

  • Linear, stable, repeatable conversion

  • Wide range (0.5 ppb – 50 ppm tested)

  • Cost-effective solution

  • Fast response (< 2 seconds)

  • Simple installation

Automated Air Sampler – Precise Pollution Capturing

Our Direct Optics Automated Air Sampler offers an effective solution for capturing gases in response to specific events or on preset schedules. It has multi-canister sampling capabilities and enables valuable insights into pollution events and air quality measurement in sensitive environments. With its user-friendly touch screen and intuitive software, our sampler will make capturing gases simple and hassle-free.

Direct-optics. Innovation in Air Emissions Measurement

Why Choose the Direct Optics Automated Air Sampler?

  • Modbus TCP/IP communication

  • Remotely accessible HMI

  • Automatic label printout

  • Onboard UPS

Environmental Impact:

The Critical Role of Accurate NO₂ Measurement

Our products play a vital role in environmental preservation. Nitrogen Dioxide (NO2) and Nitric Oxide (NO), collectively known as NOX, originate primarily from combustion sources, posing a threat to both human health and the environment.

NO2, a potent pollutant, contributes to the formation of ozone (O3), leading to ozone-related issues. It also transforms into Nitric Acid, a key driver of acid rain, impacting water bodies and soil. Accurate NO2 measurement is essential for addressing climate change, formulating air quality policies, and improving emissions modeling. Our innovative solutions are dedicated to achieving these environmental goals.

History

Direct Optics Inc., was founded with a commitment to advancing air emissions measurement. Through years of research and recognizing the need for a more accurate and efficient way to measure NO2 and NOX, we developed the G60 – the first dual-channel CRDS analyzer capable of direct measurement, eliminating the inaccuracies of traditional conversion techniques. Built on our expertise in Cavity Ring-Down Spectroscopy (CRDS), the G60 ensures reliable regulatory compliance and supports atmospheric research. This breakthrough provides continuous, real-time data for both regulatory and research applications.

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