Design and Measurement of the Peltier Cell Thermal Actuator for Fine Adjustment

2021 ◽  
pp. 46-53
Author(s):  
Jan Hošek
Keyword(s):  
Thermal Actuator ◽  
Fine Adjustment

Design and performance of a thermal actuator driving a preloaded linear translation stage

2021 ◽  
Vol 71 ◽  
pp. 187-199
Author(s):  
Chunjie Fan ◽  
D.J. Hastings ◽  
Joshua A. Tarbutton ◽  
Stuart T. Smith
Keyword(s):  
Thermal Actuator ◽  
Translation Stage ◽  
And Performance

An Auto-Focus Algorithm of Fast Search Based on Combining Rough and Fine Adjustment

2012 ◽  
Vol 468-471 ◽  
pp. 534-537
Author(s):  
Zhao Hua Lin ◽  
Xin Liu ◽  
Yu Liang Zhang ◽  
Shu Mei Zhang
Keyword(s):  
Focal Plane ◽  
Narrow Range ◽  
Evaluation Function ◽  
Small Step ◽  
Uniform Sampling ◽  
Fast Search ◽  
Optical Measure ◽  
Fine Adjustment ◽  
Auto Focusing ◽  
Image Definition

A coarse and fine combined fast search and auto-focusing algorithm was suggested in this paper. This method can automatically search and find the focal plane by evaluating the image definition. The Krisch operator based edge energy function was used as the big-step coarse focusing, and then the wavelet transform based image definition evaluation function, which is sensitivity to the variation in image definition, was used to realize the small-step fine focusing in a narrow range. The un-uniform sampling function of the focusing area selection used in this method greatly reduces the workload and the required time for the data processing. The experimental results indicate that this algorithm can satisfy the requirement of the optical measure equipment for the image focusing.

Packaging of In-Plane Thermal Microactuators for BioMEMS Applications

2005 ◽  
Author(s):  
Hrishikesh V. Panchawagh ◽  
Faheem F. Faheem ◽  
Cari F. Herrmann ◽  
David B. Serrell ◽  
Dudley S. Finch ◽  
...  
Keyword(s):  
Flip Chip ◽  
Atomic Layer ◽  
Thermal Actuator ◽  
Mems Devices ◽  
Thermal Actuators ◽  
Layer Deposition ◽  
Comb Drives ◽  
Small Clearance ◽  
Surrounding Liquid ◽  
Packaging Technique

This paper addresses two issues related to in-plane, electro-thermal actuators for BioMEMS applications. First, in order to protect the actuator from biological debris and particulates, a packaging technique using a flip-chip bonded polysilicon cap is demonstrated. The encapsulated actuator transmits motion outside the package via a piston, which moves through a small clearance. The second issue addressed is the reduction in efficiency of the thermal actuator in liquids. By coating the packaged actuator with a thin conformal hydrophobic layer via an atomic layer deposition (ALD) process, the liquid is prevented from entering the encapsulation. This avoids direct contact between the actuator and the surrounding liquid thereby improving its efficiency. The unpackaged and packaged actuators were tested in both air and de-ionized water. Although the packaging resulted in a reduction in the performance of the thermal actuator in air, the actuation efficiency in water was significantly improved due to the isolation of the hot arms from the liquid. This packaging technique is also applicable to other MEMS devices and in-plane actuators such as electrostatic comb drives for engineering as well as biological applications.

scholarly journals A Two-speed Fine Adjustment

1903 ◽  
Vol 23 (1) ◽  
pp. 19-20
Author(s):  
EdwardM. Nelson
Keyword(s):  
Fine Adjustment

scholarly journals A Comparative Study of Multi-form Steam Generators Using Concentrated Solar Power

2021 ◽  
Vol 88 (2) ◽  
pp. 157-168
Author(s):  
Ayad T. Mustafa ◽  
Mohammed M. Hadi
Keyword(s):  
Renewable Energy ◽  
Cylindrical Cavity ◽  
Steam Generation ◽  
Concentrated Solar Power ◽  
Steam Generators ◽  
Solar Concentrators ◽  
Investment Cost ◽  
High Investment ◽  
Solar Receiver ◽  
Fine Adjustment

Solar energy reaching Earth can be used as promising renewable energy to overcome the challenges of steam generation processes. Solar concentrators suffer from fine adjustment of solar radiation concentration and high investment cost. Therefore, multi-configuration receivers named the cylindrical cavity receiver, helical receiver, and the absorber-evaporator-tank have been manufactured from the coiled copper tube and brass plates, respectively. Then, they are tested and compared to improve the performance of steam generators. The performance of the absorber-evaporator-tank receiver has been compared with the cylindrical cavity receiver and helical receiver for a period from 10 am to 12 pm. The present investigation shows that the boiling point of water increasing when the pressure of generated steam increases particularly inside the coiled tube, which affects the dryness fraction of the generated steam. The present results show that the efficiency of the absorber-evaporator-tank is greater than the cylindrical cavity and helical receivers for the tested period. It is found that the thermal efficiency for the absorber-evaporator-tank doubles at noon, which indicates an effective solar receiver for generating steam.

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