The reflective spectra of two glass systems of Na2O-ZnO-GeO2-SiO2-PbO(Sb2O3) were measured to study the effects of PbO and Sb2O3 on properties in SiO2-based glasses. The infrared reflective coefficients and anomalous ...The reflective spectra of two glass systems of Na2O-ZnO-GeO2-SiO2-PbO(Sb2O3) were measured to study the effects of PbO and Sb2O3 on properties in SiO2-based glasses. The infrared reflective coefficients and anomalous dispersion regions change with the content of PbO and Sb2O3 respectively, furthermore the refractive indices (nr) of glasses are 0. 81 and 0. 84 at the wavelength of CO2 laser (940cm-1). The glasses of two systems can be used as the cladding materials of hollow waveguides for transmitting CO2 laser.展开更多
In this paper a new kind of mid - infrared fiber material is reported. The reflective coefficients (R) of glasses in the system Na2O - ZnO - GeO2-SiO2-PbO have been measured-the refractive index becomes less than unit...In this paper a new kind of mid - infrared fiber material is reported. The reflective coefficients (R) of glasses in the system Na2O - ZnO - GeO2-SiO2-PbO have been measured-the refractive index becomes less than unity at 1180 - 900cm-1 range because of the existence of anomalous dispersion. The optical losses of hollow waveguides were calculated,the predicted losses at 940cm-1are 0. 65 and 0. 081B/ m as the inner diameter of fiber is 0. 5 and 1. 0mm respectively. The glasses can be used as the cladding materials of hol-low waveguides for transmitting CO2 laser from the measurements of characteristic temperatures, coefficient of expansion and chemical durability.展开更多
Both titanium and germanium were introduced into silicon dioxide system by sol-gel method to move its region of anomalous dispersion caused by IR resonance absorption towards the wavelength of CO 2 laser.It is indica...Both titanium and germanium were introduced into silicon dioxide system by sol-gel method to move its region of anomalous dispersion caused by IR resonance absorption towards the wavelength of CO 2 laser.It is indicated by IR absorption spectra that as the content of SiO 2 decreases in this glass system TiO 2 and GeO 2 tends to exist in their own phases.As for the gel glass with a composition of 40SiO 2·30TiO 2·30GeO 2,when the temperature is below 600℃,germanium atoms exist mainly in Ge-O-Ge bonds.With the temperature increasing from 800℃ to 1000℃, titanium atoms in Si-O-Ti bonds almost transform into Ti-O-Ti bonds.Furthermore,a large number of Si-O-Ti and Si-O-Ge bonds formed when the temperature approaches 800℃,which makes a notable IR absorption band round the wavelength of CO 2 laser.Therefore, sol-gel based SiO 2-TiO 2-GeO 2 gel glass is a candidate material for CO 2 laser hollow waveguide.展开更多
可调谐半导体激光吸收光谱（TDLAS）技术具有很高的选择性和灵敏度,能够实现污染区域环境中痕量氨气（NH_3）的在线检测。影响TDLAS系统测量精度的因素有很多,温度和压力是最基本的两个影响条件。首先介绍了TDLAS原理和实验系统,然后研...可调谐半导体激光吸收光谱（TDLAS）技术具有很高的选择性和灵敏度,能够实现污染区域环境中痕量氨气（NH_3）的在线检测。影响TDLAS系统测量精度的因素有很多,温度和压力是最基本的两个影响条件。首先介绍了TDLAS原理和实验系统,然后研究了温度变化对检测结果的影响,温度在-10℃~50℃之间,使用空芯波导（Hollow Waveguide,HWG）气体池对浓度为50 ppm的NH3进行检测,得到其二次谐波光谱图,从图中可以得出在该温度范围内,NH_3二次谐波信号幅度随温度升高而减小。温度不变,气体池内压力从0 k Pa变化到100 k Pa时,二次谐波信号的幅度随着压力增加而减小。根据实验结果,给出了该系统的温度压力修正公式。修正后,50 ppm的NH_3在不同温度下的最大检测相对误差为-5.5%。对30 ppm的NH_3长时间监测结果表明,修正后系统能够适应现场监测需求。展开更多
文摘The reflective spectra of two glass systems of Na2O-ZnO-GeO2-SiO2-PbO(Sb2O3) were measured to study the effects of PbO and Sb2O3 on properties in SiO2-based glasses. The infrared reflective coefficients and anomalous dispersion regions change with the content of PbO and Sb2O3 respectively, furthermore the refractive indices (nr) of glasses are 0. 81 and 0. 84 at the wavelength of CO2 laser (940cm-1). The glasses of two systems can be used as the cladding materials of hollow waveguides for transmitting CO2 laser.
文摘In this paper a new kind of mid - infrared fiber material is reported. The reflective coefficients (R) of glasses in the system Na2O - ZnO - GeO2-SiO2-PbO have been measured-the refractive index becomes less than unity at 1180 - 900cm-1 range because of the existence of anomalous dispersion. The optical losses of hollow waveguides were calculated,the predicted losses at 940cm-1are 0. 65 and 0. 081B/ m as the inner diameter of fiber is 0. 5 and 1. 0mm respectively. The glasses can be used as the cladding materials of hol-low waveguides for transmitting CO2 laser from the measurements of characteristic temperatures, coefficient of expansion and chemical durability.
文摘Both titanium and germanium were introduced into silicon dioxide system by sol-gel method to move its region of anomalous dispersion caused by IR resonance absorption towards the wavelength of CO 2 laser.It is indicated by IR absorption spectra that as the content of SiO 2 decreases in this glass system TiO 2 and GeO 2 tends to exist in their own phases.As for the gel glass with a composition of 40SiO 2·30TiO 2·30GeO 2,when the temperature is below 600℃,germanium atoms exist mainly in Ge-O-Ge bonds.With the temperature increasing from 800℃ to 1000℃, titanium atoms in Si-O-Ti bonds almost transform into Ti-O-Ti bonds.Furthermore,a large number of Si-O-Ti and Si-O-Ge bonds formed when the temperature approaches 800℃,which makes a notable IR absorption band round the wavelength of CO 2 laser.Therefore, sol-gel based SiO 2-TiO 2-GeO 2 gel glass is a candidate material for CO 2 laser hollow waveguide.
文摘可调谐半导体激光吸收光谱（TDLAS）技术具有很高的选择性和灵敏度,能够实现污染区域环境中痕量氨气（NH_3）的在线检测。影响TDLAS系统测量精度的因素有很多,温度和压力是最基本的两个影响条件。首先介绍了TDLAS原理和实验系统,然后研究了温度变化对检测结果的影响,温度在-10℃~50℃之间,使用空芯波导（Hollow Waveguide,HWG）气体池对浓度为50 ppm的NH3进行检测,得到其二次谐波光谱图,从图中可以得出在该温度范围内,NH_3二次谐波信号幅度随温度升高而减小。温度不变,气体池内压力从0 k Pa变化到100 k Pa时,二次谐波信号的幅度随着压力增加而减小。根据实验结果,给出了该系统的温度压力修正公式。修正后,50 ppm的NH_3在不同温度下的最大检测相对误差为-5.5%。对30 ppm的NH_3长时间监测结果表明,修正后系统能够适应现场监测需求。
