Transmittance of near infrared energy by binary glasses

Abstract

A study has been made of the transmittance of near infrared energy by a number of binary glasses. Of the systems studied, the lithia-silica and lead oxide-silica were found to have the highest transmittance of cnergy ill the range of wavelengths from 3.0 to 5.0 micron s. Thc' t rallsmittance of lithia-silica is compared with that of 1.he other alkali-silica glasses. Values of transmittance are given for lead silicate glasses of highcr lead eontellt than have been previously reported in the literature.

Absorption of near-infrared energy by certain glasses

“…(Reinhold Publishing Oorp., New York, N. Y., 1938). This can be proved a.s follows: The en ergy entering the glass is (1)(2)(3)(4)(5)(6)(7)(8). If (I-T ,) is the internal [lbsorptance of the glass sample, the energy reaching the .econd surface is (l-8)- (1)(2)(3)(4)(5)(6)(7)(8) (I-T,).…”

“…Roman, Marboe, a nd W eyl also fOU1:d Lh aL glass surfaces containing Ba++ and Pb++ lO ns, among oth ers, show ed decr easing hygroscopicity with decr easing ionic po tent ial [2]. It h as been found th at glasse cont aining BaO and PbO h ave a hi gh t.ransmi ssivity for infrared energy for wavolengt bs of 2.5 to 4.5 p, [3,4] .…”

“…If (I-T ,) is the internal [lbsorptance of the glass sample, the energy reaching the .econd surface is (l-8)- (1)(2)(3)(4)(5)(6)(7)(8) (I-T,). 'rhen, t he energy leaving the ~Iass is (1)(2)(3)(4)(5)(6)(7)(8)…”

Transmission of near-infrared energy by some two- and three-component glasses

“…The wavelengths at whicb these bands occur tray vary slightly for differe:l?-t compositions, but the absorption bands for COl-ta m molecular vibrations have been identified by corr.parison with those of the single compounds . A list of the vibrating groups and the w:avel e~lgth s of t!leir absorption bands h ave been given m a prevIOUS p aper [2].…”

“…The size of th e Pb and Ba atorrs rr..ay be such that t he symm etry of the Si04 tetrahedron is modified . 1 Presen ted at the Fiftieth Annual Meeting of the Am erican Ceramic Society, Chi cago, Ill. , April 27 , 1948.…”