Gas sensor of hydroxyl group using optoelectronic characteristics of eco-friendly lead-free perovskites

2021 ◽  
Vol 27 (3) ◽  
pp. 90-93
Keyword(s):  
Gas Sensor ◽  
Lead Free ◽  
Hydroxyl Group

Lead-free CsCu2I3 Perovskite Nanostructured Networks Gas Sensor for Selective Detection of Trace Nitrogen Dioxide at Room Temperature

2021 ◽  
pp. 1-1
Author(s):  
Xia Sun ◽  
Jie Yang ◽  
Zhilin Wu ◽  
Gang Meng ◽  
Xuezheng Guo ◽  
...  
Keyword(s):  
Nitrogen Dioxide ◽  
Gas Sensor ◽  
Room Temperature ◽  
Lead Free ◽  
Selective Detection

Graphene-Based Gas Sensor Loaded with Lead-Free Perovskite Nanocrystals

2021 ◽  
Vol MA2021-01 (63) ◽  
pp. 1671-1671
Author(s):  
Juan Casanova-Chafer ◽  
Rocio Garcia-Aboal ◽  
Pedro Atienzar ◽  
Eduard Llobet
Keyword(s):  
Gas Sensor ◽  
Lead Free ◽  
Perovskite Nanocrystals

Stable interconnections for LTCC micro-heater using isothermal solidification technique

2018 ◽  
Vol 30 (1) ◽  
pp. 35-41 ◽  
Author(s):  
Duguta Suresh Kumar ◽  
Nikhil Suri ◽  
P.K. Khanna
Keyword(s):  
Surface Area ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Mechanical Stability ◽  
Thick Films ◽  
Isothermal Solidification ◽  
Lead Free ◽  
Content Type ◽  
Wide Range ◽  
Ltcc Substrate

Purpose The purpose of this work is to explore the forms of intermetallic phase compounds (IMPCs) in Pt/In/Au and Pt/In/Ag joints by using isothermal solidification. This lead-free technique leads to formation of IMPCs having high-temperature stable joints for platinum-based micro-heater gas sensor fabricated on low temperature co-fired ceramic (LTCC) substrate. Design/methodology/approach Proposed task is to make an interconnection for Pt micro-heater electrode pad to the silver and gold thick-films printed on LTCC substrate. Both Pt/In/Au and Pt/In/Ag configured joints with different interactive areas prepared at 190 and 220°C to study temperature and contact surface area effects on ultimate tensile strength of the joints, for a 20 s reaction time, at 0.2 MPa applied pressure. Those delaminated joint interfaces studied under SEM, EDAX and XRD. Findings IMPCs identified through material analysis using diffraction analysis of XRD data are InPt3, AgIn2, AgPt, AgPt3, Au9In4 and other stoichiometric compounds. The interactive surface area between thick-films and temperature increment shows improvement in the formations of IMPCs and mechanical stability of joints. These IMPCs-based joints have improved the mechanical stability to the joints to sustain even at high operating temperatures. Elemental mapping of the weak joint contact interface shows unwanted oxide formations also reported. Physical inter-locking followed by the diffusion phenomenon on the silver substrate strengthen the interconnection has been noticed. Research limitations/implications Inert gas environment creation inside the chamber to isolate the lead-free joint placed between heating stamp pads to avoid oxide formations at the interface while cooling which adds up to the cost of manufacturing. Most of the oxides at a joint-interface increase minute to moderate resistance with respect to the level of oxides took place. These oxides contributed heat certainly damage the micro-heater based gas sensors while functioning. Practical implications These isothermal solidification-based lead-free solder joints formation replace the existing lead-based packaging techniques. These lead-free interconnections on ceramic or LTCC substrate are reliable and durable, especially those designed to work for heavy-duty engines, even at severe environment conditions. Originality/value Platinum micro-heater-based gas sensors handles over a wide-range of temperatures about 300 to 500°C. The specific temperature level of different oxide films (SnO2) on the micro-heater is capable of detecting various specific gases. This feature of platinum based gas sensor demands durable and mechanically stable joints for continuous monitoring.

Detection method of combustion oscillation characteristics under strong noise background

2020 ◽  
Vol 21 (6) ◽  
pp. 612
Author(s):  
Yunkun Wei ◽  
Tianhong Zhang ◽  
Zhonglin Lin ◽  
Qi Xie ◽  
Yan Zhang
Keyword(s):  
Radiation Thermometry ◽  
Hydroxyl Group ◽  
Interference Signal ◽  
Engine Vibration ◽  
Combustion Technology ◽  
Lean Fuel ◽  
Combustion Oscillation ◽  
Aero Engines ◽  
Temperature Measurement System ◽  
Multispectral Radiation Thermometry

After the lean fuel premixed combustion technology is applied to aero engines, severe combustion oscillations will be cased and led to hidden safety hazards such as engine vibration, further energy waste and other problems. Therefore, it is increasingly important to actively control combustion oscillations. In this paper, a multispectral radiation thermometry (MRT) is used to analyze the hydroxyl group, which is a measurable research object in the combustion chamber of an aero engine, and to fit the functional relationship between the radiation intensity ratio and the temperature in different bands. The theoretical value of the error is <2%. At the same time, in order to solve the problem of weak detection signal and excessive interference signal, an improved frequency domain filtering method based on fast Fourier transform is designed. Besides, the FPGA platform is used to ensure the real-time performance of the temperature measurement system, and simulations and experiments are performed. An oscillating signal with an oscillation frequency of 315 Hz is obtained on the established test platform, and the error is only 1.42%.

Lead-Free in Louisville

2020 ◽  
Vol 90 (10) ◽  
pp. 68-73
Author(s):  
Kelley Dearing Smith ◽  
Daniel Tegene ◽  
Denise Aaron ◽  
Emily Fritz
Keyword(s):  
Lead Free
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