利用PDLC成功研制成反射型空间光调制元件的大画面显示器

日本NHK广播技术研究所成功研制了光利用效率高,响应速度快适应于大画面投射型显示的聚合物液晶显示用的空间光调制元件。它具有对比度高及信号放大能力大幅度提高的优点,能用彩色图像显示的反射型空间光调制元件克服了过去由于读出光的菲涅耳反射以及光导电层产生漏光存在显示图像对比度降低的问题,新开发高性能的减反膜以及光吸收层a—SiGeC∶H膜也都是过去难以解决的问题。该研究所,又利用该元件制成绿色光图像投影系统。

分段刻纹镀膜光纤温度传感器的灵敏度研究

本文介绍一种分段刻纹镀膜光纤温度传感器，它是用光刻法及化学腐蚀的方法在光纤包层上直接形成的。由于它不需要外部敏感元件，因此具有体积小、结构简单、稳定性好、灵敏度高和抗干扰能力强等优点，适合于温度的高速度和安全的远距离测量。这种光纤温度传感器的灵敏度由刻纹数、刻纹深度和镀层等决定。

Proteins binding to the 5'-flanking regulatory elements of the human β-globin gene

The binding of nuclear proteins prepared from mouse erythroid tissue in different developmental stages to the 5'-flanking regulatory elements of human β-globin gene, two negative control regions(NCR1,-610 to -490 bp;NCR2, -338 to-233bp), was identified.Two stage specific protein factors corresponding to embryonic and fetal stages were found to be capable of binding to NCR2.These data provided evidence that the cis acting elements of the 5'-flanking region might be involved in the developmental control of β-globin gene and NCR2 might be responsible in part for the silence of β-globin gene in the embryonic and fetal stages.

Advances and New Applications Using the Acousto-Optic Effect in Optical Fibers

This work presents a short review of the current research on the acousto-optic mechanism applied to optical fibers. The role of the piezoelectric element and the acousto-optic modulator in the excitation of flexural and longitudinal acoustic modes in the frequency range up to 1.2 MHz is highlighted. A combination of the finite elements and the transfer matrix methods is used to simulate the interaction of the waves with Bragg and long period gratings. Results show a very good agreement with experimental data. Recent applications such as the writing of gratings under the acoustic excitation and a novel viscometer sensor based on the acousto-optic mechanism are discussed.

以激光进行报刊的超高速传真

以激光作光源使新闻的超高速电传成为可能的传真装置,由日本松下电送机器厂和松下技研共同研制成功。此种装置用60秒左右的时间即能电传一页报刊。以激光作传真光源之所以成为可能是由于利用了松下技研研制成功的光调制元件。这种元件称为'激光报刊传真器'。