色情成人吃奶激情视频在线播放-中文在线最新版天堂-久久久久噜噜噜亚洲熟女综合-来一水AV@lysav

官方微信|手機(jī)版

產(chǎn)品展廳

產(chǎn)品求購企業(yè)資訊會展

發(fā)布詢價單

化工儀器網(wǎng)>產(chǎn)品展廳>物理特性分析儀器>表面/界面性能測定儀>開爾文探針系統(tǒng)> 專業(yè)銷售 英國Uniscan Instruments SKP370 ...

專業(yè)銷售 英國Uniscan Instruments SKP370 掃描開爾文探針系統(tǒng)

具體成交價以合同協(xié)議為準(zhǔn)

聯(lián)系方式:錢經(jīng)理查看聯(lián)系方式

聯(lián)系我們時請說明是化工儀器網(wǎng)上看到的信息,謝謝!


北京恒遠(yuǎn)安諾科技有限公司,十多年來專注于儀器儀表及各種工業(yè)品進(jìn)出口.

進(jìn)口儀器儀表

SKP370

Scanning Kelvin Probe System

The Scanning Kelvin Probe (SKP) is a non-contact, non-destructive instrument designed to measure the surface work function difference between conducting, coated, or semi-conducting materials and a metallic probe. The technique operates using a vibrating capacitance probe, and through a swept backing potential, the work function difference is measured between the scanning probe reference tip and sample surface. The work function can be directly correlated to the surface condition. A unique aspect of the SKP is its ability to make measurements in a humid or gaseous environment.  Applications include: -

 
scanning kelvin probe 
Figure 1
  • Filiform corrosion studies
  • Transport process of hydrated ions
  • Study of fuel cell catalysts
  • Forensic detection of fingerprints
  • Charaterisation of photovoltaic materials
  • Femi-level mapping

The principle of operation of the Kelvin Probe is illustrated in Figure 1.

The figure represents three energy level diagrams depicting two metals having a constant separation, work functions and Fermi levels of (φ1, E1) and (φ2, E2), respectively.

The first diagram shows the metals with no electrical contact and differing Fermi levels. When electrical contact is made (middle diagram) the flow of charge allows the Fermi levels to equalize and gives rise to a surface charge.

 

The potential difference, VC, is related to the difference in work function:

-eVC = φ1 - φ2 (1) where e is the electron charge.

The inclusion of an external backing potential, VB (final diagram), allows for a nulling of the surface charge at a unique point where VB = - VC. This point represents the work function difference between the two materials.  Work function can then be used to determine the corrosion potential (Ecorr) at a specific point using the relationship:

Ecorr = Constant + (φ1 - φ2) (2) where (φ1 - φ2) is the measured work function between the probe and the sample. 

 
filiform corrosion 
Figure 2

The constant can be determined by measuring the corrosion potential using a conventional reference electrode in an electrolyte. Once the constant is known for a particular sample, Ecorr can be calculated directly from the SKP data without an electrolyte.

 

Figure 2 shows the Scanning Kelvin Probe Measurement of filiform corrosion on Aluminium

 
 

Figure 3

Figure 3 shows a surface map of the Scanning Kelvin Probe signal recorded over the heat affected zone of welded material.

 
 

Figure 4


 

Figure 4 shows a surface map of the Scanning Kelvin Probe signal recorded over a printed circuit board.

如果您對本品感興趣請與我公司
北京東方安諾生化科技有限公司
:    -8007


: www.annovatech.com
: caoye513



化工儀器網(wǎng)

采購商登錄
記住賬號    找回密碼
沒有賬號?免費(fèi)注冊

提示

×

*您想獲取產(chǎn)品的資料:

以上可多選,勾選其他,可自行輸入要求

個人信息:

溫馨提示

該企業(yè)已關(guān)閉在線交流功能

又湿又紧又大又爽A视频国产| 4444亚洲人成无码网在线观看| 日本无遮挡边做边爱边摸| 亚洲人成亚洲人成在线观看| 亚洲一区爱区精品无码| 亚洲AV无码一区二区乱子伦AS| 日木AV无码专区亚洲AV毛片 | XXXXA特别高潮| 久久精品国产精品亚洲精品| 免费人成自慰网站| 国产99久一区二区三区A片| NBA直播在线观看免费| 人妻少妇精品中文字幕AV蜜桃| 体验区试看120秒啪啪免费| 亚洲AV无码AV制服丝袜在线| 双胞胎(H)互攻| 久久无码专区国产精品S| 国产做A爰片久久毛片A片白丝| 人妻[21P]大胆| 一区二区三区内射美女毛片| 久久国产精品无码网站| 国产综合精品一区二区三区| 国产精品毛片一区二区| 亚洲精品久久久久久中文| 成人免费看吃奶视频网站| 中文字幕AV一区| 扒开腿狂躁女人爽出白浆 | 久久久亚洲AV波多野结衣| 国产亚洲色婷婷久久99精品| a片在线免费观看| 国产亚洲精品久久久无码| 又湿又紧又大又爽A视频国产| 欧美精品在线观看| 亚洲AV片一区二区三区| 成熟丰满熟妇高潮XXXXX视频| 亚洲中文字幕久久精品无码喷水 | 国产精品久久久久无码AV| 女浴室里赤裸裸洗澡丰满视频| 欧美黑人又粗又大久久久| 亚洲AV成人无码久久精品| 国产AV麻豆MAG剧集 |