|
|
|
| Low Power Gas Sensors
|
|
Cambridge CMOS Sensors (CCS) is an industry leader in sensor technology for environmental sensor solutions for a wide range of applications. We are a leading supplier of CMOS MEMS Micro-Hotplates which provide the key technology platform for chemical resistive, and catalytic, gas sensors. This technology uses standard CMOS processes, making it ideal for high volume applications, in terms of scalability and cost.
Limitations of Classic MOX Gas Sensors
Classic MOX gas sensors are large and expensive, have high power consumption and suffer from the following limitations:
Cross Sensitivity - Generally non-specific and react to a multitude of gases
Drift - The baseline and sensitivity will vary from sensor to sensor and over time
Stabilisation - The stabilisation time is several hours to days before they reach a stable baseline
To counter these limitations, expensive and frequent calibration is needed. In addition, expensive filters are required to reduce cross sensitivity.
The Cambridge CMOS Sensors Technology Advantage
Our miniature gas sensors use a unique silicon platform with advanced sensing materials, which:
Reduces the baseline stabilisation time to a few seconds
Greatly reduces cross-sensitivity and enhances selectivity of gases
Enables ultra-low power consumption for portable handheld devices
Our patented CMOS MEMS Micro-hotplates technology provides the key technology platform for our Metal oxide (MOX) gas sensors by enabling sensor miniaturisation, significantly lower power consumption and ultra-fast response times for a wide range of applications.
Our Micro-hotplates are suspended in a high reliability membrane and act as heater elements for a metal oxide-based sensing material. The Micro-hotplates contain electrodes that measure the resistance of the sensing material. Reactions to target gases cause material resistance changes at temperatures between 200oC to 400oC.
For reducing gases such as Carbon Monoxide (CO) a reaction takes place with the pre-adsorbed oxygen of the sensing material which decreases the resistance of the sensor. For oxidising gases such as Nitrogen Dioxide (NO2) the resistance increases. The magnitude of the resistive changes depends on the metal oxide composition/structure and the operating temperature of the sensor. Figure 1 illustrates the MOX gas sensor structure and how the resistance of the sensing material changes when gas molecules react on the surface.
The relationship between sensor resistance and the concentration of the target gas is non-linear and can be expressed by the following equation over a certain range of gas concentration:
Where
R(C) is the resistance of the film at gas concentration C
R0 is the resistance at zero gas concentration
K is a sensitivity parameter measurement constant
n is a parameter that varies in the range 0.3 to 0.8
The positive sign is used for oxidizing gases and the negative sign is for reducing gases
Advanced algorithms support our family of MOX gas sensors for maximum selectivity, drift compensation and for self-calibration, enabling easy and timely integration into a wide range of applications. |
|
|
|
|
主站蜘蛛池模板：
国产亚洲av夜间福利香蕉149|
天天色成人|
H肉动漫无码无修6080动漫网|
人人妻人人澡人人爽人人精品av
|
亚洲日韩av无码不卡一区二区三区
|
sihu国产午夜精品一区二区三区|
宗合久久|
国产精品一区二区中文|
国产女人十八水真多|
成熟冰莲肥胞自慰人体|
欧美成人一区二区三区不卡|
国产精品黄网在线观看|
久久777国产线看是看精品|
一本色道国产在线观看二区|
拳交av|
成人国产片视频在线观看|
国产精品综合色区av|
在线亚洲国模九九|
超碰骚少妇|
91精品国产高清久久久久久g|
人妻少妇|
天堂av在线资源|
aⅴ色综合久久天堂av色综合|
一区二区三区四区五区自拍|
亚洲av日韩av综合在线观看|
中文无码第一页|
日韩精品一区二区深田咏美|
色哟哟www网站入口成人学校|
欧美性猛交xxxx乱大交丰满
|
久久亚洲人成网站|
无码日韩av一区二区三区|
亚洲已满18点击进入在线看片|
成人视屏在线观看|
99久久精品费精品国产|
人妻少妇偷人精品一区|
亚洲成人A√|
国产成人精品午夜2022|
3d无码纯肉动漫在线观看|
亚洲天堂中文字幕|
中文在线成人|
国产在线精品观看一区|
GUARDION - Next generation portable GC/MS chemical identifier & mixture analysis
UltiMate 3000 Basic LC System
