This study provides a description of scatterplate interferometry from both a theoretical and experimental viewpoint. Although this interferometer is a relatively simple and very effective device for use in the optical shop, very little beyond a qualitative description has been previously presented. Through the use of Fourier optics and stochastic processes techniques, a more formalized theory of scatterplate interferometry is shown particularly in how the flip or inversion symmetry of the scatterplate itself affects the flip symmetry. Also described are the effects on the fringe quality produced by non laser sources as well as aberrations in the interferometer optics. Experimental verification of these aspects is shown to be in good agreement with the theory. Of interest to the shop user of this interferometer is the material presented on scatterplate fabrication. Techniques for making the conventional, "double-exposure" or "180°-type" scatterplate, are very simple to those with access to a holography lab. Additional refinements including null testing with the scatterplate and an infrared scatterplate interferometer are also described.

A new type of computer-controlled instrument has been developed to measure microviscoelastic properties of thin materials. It can independently control and measure indentation loads and depths in situ revealing information about material creep and relaxation. Sample and indenter positions are measured with a specially designed polarization interferometer. Indenter loadings can be varied between 0.5 and 10 grams and held constant to ±41 mg. The resulting indentation depths can be measured in situ to ±1.2 nm. The load required to maintain constant indentation depths from 0.1 to 5.0 microns can be measured in situ to ±3.3 mg and the depth held constant to ±15 nm.

Made available in DSpace on 2014-06-11T19:35:46Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-06-22Bitstream added on 2014-06-13T21:08:04Z : No. of bitstreams: 1 shimizu_fm_dr_bauru.pdf: 1060296 bytes, checksum: 63745c957542a90554b00f3723c1c813 (MD5) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / Foi desenvolvida uma montagem experimental para estudar o processo de polarização fotoassistida (PAP) de filmes finos poliméricos utilizando um interferômetro de Mach-Zehnder (IMZ). Ela permite determinar a atividade eletro-óptica do filme durante e após o processo de polarização. Um cristal de KH2PO4 (KDP) e o filme guest-host do polímero acrílico poli(metacrilato de metila), PMMA, dopado com o corante vermelho disperso 1, DR1, mostraram o bom funcionamento do sistema de medição IMZ/PAP. Dois azopolímeros acrílicos, o poli(metacrilato de vermelho disperso 1), PMDR1, e o poli(metacrilato de metila)-co-(metacrilato de vermelho disperso 1), PMMcoMDR1, foram estudados variando-se a tensão dc de polarização e a intensidade da luz de excitação. Os dados experimentais obtidos foram ajustados por equações fenomenológicas de Sekkat e KWW para obtenção dos tempos característicos de cada processo durante e após a polarização do filme. O valor máximo de coeficiente eletro-óptico de ~20pm/V foi obtido para o filme do polímero acrílico de PMDR1, enquanto que para os filmes de PMMA/DR1 e PMMcoMDR1 os valores foram de 0,5 e 1,6 pm/V / We developed an experimental setup aiming to study the photoassisted poling (PAP) of polymeric films using a Mach-Zehnder interferometer (MZI). Is allows measuring the electric optic coefficient during and after the photoassisted poling process. The proper operation the IMZ/PAP measurement system was demonstrated using a KH2PO4 (KDP) crystal and poly(methyl methacrylate), PMMA, doped with the dye disperse red 1, DR1, guest-host films. Two acrylic azopolymers, poly(methacrylate disperse red 1), PMDR1, and poly(methyl methacrylate)-co-(methacrylate disperse red 1), PMMcoMDR1 were studied under different dc voltage poling and light excitation intensity. The experimental data obtained were fitted by Sekkat and KWW equations to give the characteristics time of each poling process and its decays. The maximum electro-optical coefficient of ~20 pm/V were obtained with the PMDRI acrylic polymer film while for PMMA/DR1 and PMMcoMDR1 the values were 0.5 and 1.6 pm/V

Orientador: José Alberto Giacometti / Banca: Sandro Márcio Lima / Banca: Fernando Fuzinatto Dall'Agnol / Banca: Victor Ciro Solano Reynoso / Banca: Clarissa de Almeida Olivati / O Programa de Pós Graduação em Ciência e Tecnologia de Materiais, PosMat, tem caráter institucional e integra as atividades de pesquisa em materiais de diversos campi / Resumo: Foi desenvolvida uma montagem experimental para estudar o processo de polarização fotoassistida (PAP) de filmes finos poliméricos utilizando um interferômetro de Mach-Zehnder (IMZ). Ela permite determinar a atividade eletro-óptica do filme durante e após o processo de polarização. Um cristal de KH2PO4 (KDP) e o filme guest-host do polímero acrílico poli(metacrilato de metila), PMMA, dopado com o corante vermelho disperso 1, DR1, mostraram o bom funcionamento do sistema de medição IMZ/PAP. Dois azopolímeros acrílicos, o poli(metacrilato de vermelho disperso 1), PMDR1, e o poli(metacrilato de metila)-co-(metacrilato de vermelho disperso 1), PMMcoMDR1, foram estudados variando-se a tensão dc de polarização e a intensidade da luz de excitação. Os dados experimentais obtidos foram ajustados por equações fenomenológicas de Sekkat e KWW para obtenção dos tempos característicos de cada processo durante e após a polarização do filme. O valor máximo de coeficiente eletro-óptico de ~20pm/V foi obtido para o filme do polímero acrílico de PMDR1, enquanto que para os filmes de PMMA/DR1 e PMMcoMDR1 os valores foram de 0,5 e 1,6 pm/V / Abstract: We developed an experimental setup aiming to study the photoassisted poling (PAP) of polymeric films using a Mach-Zehnder interferometer (MZI). Is allows measuring the electric optic coefficient during and after the photoassisted poling process. The proper operation the IMZ/PAP measurement system was demonstrated using a KH2PO4 (KDP) crystal and poly(methyl methacrylate), PMMA, doped with the dye disperse red 1, DR1, guest-host films. Two acrylic azopolymers, poly(methacrylate disperse red 1), PMDR1, and poly(methyl methacrylate)-co-(methacrylate disperse red 1), PMMcoMDR1 were studied under different dc voltage poling and light excitation intensity. The experimental data obtained were fitted by Sekkat and KWW equations to give the characteristics time of each poling process and its decays. The maximum electro-optical coefficient of ~20 pm/V were obtained with the PMDRI acrylic polymer film while for PMMA/DR1 and PMMcoMDR1 the values were 0.5 and 1.6 pm/V / Doutor