Differentiating Laser Gas Analyzers: Tunable Diode vs Quantum Cascade

In today's manufacturing industry, no site is complete without gas analyzers. These devices scan the atmosphere to detect present trace elements. This allows the closed environment to be controlled as well as minimizes any form of impurity from affecting operations.

Among the different gas analyzers available, the quantum cascade laser (QCL) and tunable diode laser (TDL) analyzer is the most efficient. While both use light to sense particles in the atmosphere, there are still clear distinctions between the two. To help you understand, here's what you need to know about them.

TDL Gas Analyzer

TDLs are pretty straightforward devices. A tunable diode emits near infrared (NIR) light in the form of a laser beam, and information about anything that "reflects" back is immediately processed. The reduced wavelength that returns is used to measure signal intensity, which determines the density and other properties of a gas cluster like water vapor and methane. O2, HCl, HF, NH3, CO, HCN, NO, CO2, H2O, H2S, N2O, and CH4 are some examples of chemicals these lasers detect.
Aside from elemental concentration, TDLs also uses NIR beams to determine:

·        Temperature
·        Pressure
·        Velocity
·        Mass flux

The TDLs' simplicity and directness have several advantages. For example, their calibration is highly stable, and they allow continuous and fast in-situ measurement. Also, because the laser can be tuned to commit to a single particle, cross-interference with other elements is kept to a minimum. This makes TDLs ideal as accurate gas measurement tools.

QCL Gas Analyzer

QCLs are more complicated. They're semiconductors that emit infrared (IR) bands to detect the interaction between waves and matter. Once the light hits an element, multiple electron layers are sent repeatedly, cascading the quantum wells for each transition; this is different from TDLs, which use the energy gap instead. Because of this, wavelengths from QCLs can be fine-tuned for wider range and higher accuracy.

By operating under the quantum theory of repeatedly cascading electrons, QCLs have shown better results in:

·        High-resolution spectroscopy (HRS)
·        Remote sensing
·        Multiple element detection
·        Data delivery (sup-part-per-million and percent levels)
·        Mid-infrared (MIR) and far-infrared (FIR) detection

These advantages in precision, controllability and range make QCL ideal for continuous emission monitoring systems (CEMS), ethyl production, natural gas harvesting, combustion control, and chemical reduction.

These are the differences between a quantum gas laser analyzer and tunable diode laser gas analyzer. While both use light to detect particles, the process for each is different. To learn more about these two, talk with a manufacturer today.

Comments

Post a Comment

Popular posts from this blog

Toxic Gases You Might Be Inhaling at Home

Image
Various types of gases are particularly toxic that being exposed to them can result in health problems. This article lists 3 of these poisonous fumes. Read on to learn about their harmful effects on the human body. Carbon Monoxide Carbon monoxide is an extremely toxic gas produced when burning fuel, oil, or wood. It's often regarded as a "silent killer" since it's odorless, tasteless, and colorless. A person won't even notice that they're already inhaling large amounts and getting poisoned.  Everyone is at risk of carbon monoxide poisoning, but children are the most vulnerable since they don't have a fully developed immune system yet. Senior citizens are also in danger, especially if their health is starting to decline due to their advanced age. Exposure to carbon monoxide is pretty common in a household that doesn't have a continuous emissions monitoring device in place. When this happens, the gas will immediately enter the bloodstream ...
Read more

A Primer on Continuous Monitoring Systems

Image
Gaseous chemicals are emitted into the atmosphere during normal operations of manufacturing facilities. If left unregulated, these emissions can pose a threat to both the environment and living organisms, including humans. As a result, the United States Environmental Protection Agency (EPA) imposes a standard for air quality which companies must comply with for health and safety purposes. One way to make sure these are followed is through continuous monitoring system or CMS. What It Is CMS is a tool that collects and analyzes information from an emission source. The data is then used to validate compliance with EPA's regulations, as well as to oversee and analyze a facility's processes. This can be achieved by fulfilling the following functions: 1.        Performance Indicator: Proper operation of pollution control measures and emission standard compliance are two parameters that CMS ensures observance. 2.        M...
Read more