Sensorless synchronization method for thin-film direct optical broadband monitoring system


Autoria(s): MARTINS, A. L.; RODRIGUES, E. L. L.
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

18/10/2012

18/10/2012

2011

Resumo

Optical monitoring systems are necessary to manufacture multilayer thin-film optical filters with low tolerance on spectrum specification. Furthermore, to have better accuracy on the measurement of film thickness, direct monitoring is a must. Direct monitoring implies acquiring spectrum data from the optical component undergoing the film deposition itself, in real time. In making film depositions on surfaces of optical components, the high vacuum evaporator chamber is the most popular equipment. Inside the evaporator, at the top of the chamber, there is a metallic support with several holes where the optical components are assembled. This metallic support has rotary motion to promote film homogenization. To acquire a measurement of the spectrum of the film in deposition, it is necessary to pass a light beam through a glass witness undergoing the film deposition process, and collect a sample of the light beam using a spectrometer. As both the light beam and the light collector are stationary, a synchronization system is required to identify the moment at which the optical component passes through the light beam.

Identificador

JOURNAL OF INSTRUMENTATION, v.6, 2011

1748-0221

http://producao.usp.br/handle/BDPI/17699

10.1088/1748-0221/6/05/P05003

http://dx.doi.org/10.1088/1748-0221/6/05/P05003

Idioma(s)

eng

Publicador

IOP PUBLISHING LTD

Relação

Journal of Instrumentation

Direitos

restrictedAccess

Copyright IOP PUBLISHING LTD

Palavras-Chave #Control and monitor systems online #Pattern recognition, cluster finding, calibration and fitting methods #Data processing methods #Data acquisition concepts #QUARTERWAVE MULTILAYER FILTERS #Instruments & Instrumentation
Tipo

article

original article

publishedVersion