Things You Didn't Know About Methane Detection

From the coal mine”gas”Speaking of

As early as19century,Coal miners used canaries carried down the mine as a warning sign of gas leaks.(methane)leakage——The bird fainted,People then evacuated。This is the most primitive method of methane detection used by humankind.。

20early 20th century,Catalytic combustion detectors have been developed.,The canary is the real”retire”。decades thereafter,Methane detection technology is constantly evolving with industrialization.,From the laboratory to the mine、pipeline、City gas network,Further extending to atmospheric environmental monitoring。

Why is methane testing necessary in society??

① Safety red line

The explosion limit of methane is5%–15%,Leakage and accumulation can easily lead to deflagration.。Coal mine gas accident、Urban gas pipeline leak,Behind every incident lies the cost of lives.。

② Climate responsibility

Methane is second only toCO₂The second largest greenhouse gas,20The warming effect over the year isCO₂of80double。Globally30%Anthropogenic global warming originates from methane emissions。carbon reduction,Methane must be controlled first。

③ Hard policy constraints

China”dual carbon”Target、Global Methane Commitment(Global Methane Pledge)Successive implementations,oil and gas、coal、Methane emission monitoring in sectors such as agriculture has shifted from voluntary to mandatory compliance.。

Safety、Environmental friendly、Compliance,Three driving forces have made methane detection an unavoidable necessity.。

Forty-year evolution of technological approaches

First generation|Catalytic combustion(1920s～)

Platinum wire catalyzed methane oxidation,Concentration measured by resistance change。Simple structure、Extremely low cost,However, platinum wire is prone to poisoning and becomes ineffective.,And can only judge”Is there?”,Unable to quantify precisely。

Second generation|Semiconductor metal oxide(1960s～)

The electrical resistance of materials such as tin oxide changes when exposed to methane.,Fast response、Low price。The fatal weakness is poor selectivity.,Alcohol、Carbon monoxide can make it”False alarm”,Humidity changes also significantly interfere with readings.。

Third generation|NDIRNon-dispersive infrared(1980s～)

Utilizing the absorption characteristics of methane in specific infrared bands,Significantly improved stability and lifespan,Becoming the mainstream of current industrial applications。But broadband light sources”Shotgun”Irradiation-induced selectivity still has limitations,Sensitivity is difficult to improveppmQuantity。

Fourth generation|Laser absorption spectrum TDLAS(2000s～now)

Tunable semiconductor lasers precisely scan methane1653nmCharacteristic absorption peaks,To achieve the true meaning”Molecular fingerprint”Identification。

Why is the laser path the optimal solution??

The core advantage of laser detection lies in:A laser beam only”know”methane,Other gases produce almost no interference.,This is a physical advantage that broadband light source solutions can never match.。

chip,It is the heart of laser detection

TDLASSystem performance ceiling,Determined by the laser chip。Wavelength accuracy、Power stability、Temperature drift characteristics,Each of these factors directly affects the detection limit and system reliability.。

WindmillFocusing on near-infrared laser chip research and development,For methane detection window,supplyMultiple stylesEngineering-proven core light source:

| 1653nmDFBchip

Features:peak wavelength1652.7–1654.7nm,Precisely covering the strong absorption line of methane

Typical optical power10mW,SMSR > 45dB,working temperature-20～85°C

Scene:Fixed pipes/Wellhead methane leak monitoring station、Online monitoring of coal mine gas、Continuous monitoring of methane emissions at the industrial park boundary

| 1650nmDFBchip

Features:40mALow drive current,Optical power5mW,SMSR > 45dB

working temperature-20～65°C,Suitable for compact integration

Scene:Portable methane detector、Urban gas pipeline inspection equipment、Home/Commercial gas leak alarm

| 1654nmVCSELsingle-mode chip

Features:Threshold current as low as0.4mA,Simple structure,Low cost

Scene:Battery-powered long-term unattended monitoring nodes(oil and gas well sites、landfill)、Internet of Things Distributed Methane Sensor Network、Rapid Development of Integrated Methane Sensing Modules for Small and Medium-Sized Manufacturers、Civil gas safety alarm

| alsobesides1676nmwavelengthDFBchip,Key performance indicators and1653nmDFBchipConsistent。

In conclusion

From mine safety to carbon neutrality monitoring,The battlefield for methane detection is expanding.。Laser chips are the core of this technological upgrade.。

Hangzhou Wenmi Core Optoelectronics,With chip-level precision,Provides the most stable and reliable light source foundation for your methane detection solution.。

Welcome to contact us15308024787(Mr. Li,WeChat ID),Together, we will create the next generation of high-performance methane detection solutions.!