DIODE-LASER ATOMIC-ABSORPTION USING A NEW REFERENCE METHOD

被引：4

作者：

BARBER, TE ^{[1
]}

WALTERS, PE ^{[1
]}

WENSING, MW ^{[1
]}

WINEFORDNER, JD ^{[1
]}

机构：

[1] UNIV FLORIDA,DEPT CHEM,GAINESVILLE,FL 32611

来源：

SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY | 1991年 / 46卷 / 6-7期

关键词：

D O I：

10.1016/0584-8547(91)80097-M

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

A diode laser was used as the source for atomic absorption spectroscopy. To overcome the frequency instability and drift of the laser, a new referencing approach is proposed. The frequency of the laser is modulated across the rubidium transition at 780.02 nm, and the absorption signal is detected in an air/hydrogen flame. The absorption signal is processed by a lock-in amplifier. The reference signal for the lock-in amplifier is generated by shaping the absorption signal from a Rb atomic vapor cell into a square wave. As the laser frequency drifts, no phase change occurs between the reference and analytical signals, eliminating noise and signal loss that would have been caused by using a reference method which does not follow the fluctuations of the laser.

引用

页码：1009 / 1014

页数：6

共 15 条

[1] PHOTON ECHOES IN CS VAPOUR [J].