![]() ![]() B.1 Instrumentation The hollow cathode lamp: The most important aspect of AAS instrumentation is the light source, the most common of which is the hollow cathode lamp (HCL). This saved storage space and analysis time. Atomic Spectrometry Vahid Majidi, in Encyclopedia of Physical Science and Technology (Third Edition), 2003 IV. A large number of data collected during atomization period is compressed in machine code. for atomic absorption spectrometers) and as a frequency tuner for light sources such as lasers. A sampling rate of 16 during a signal period at 50‐Hz chopping frequency is found to be the optimum value. Basic diagram of a hollow-cathode lamp Hollow-cathode lamps from an atomic absorption spectrometer A hollow-cathode lamp (HCL) is type of cold cathode lamp used in physics and chemistry as a spectral line source (e.g. The data acquisition program is written in machine language and synchronization between light sources and computer is provided by chopper position signal through the interrupts. The D 2 lamp is chopped by a mechanical chopper driven by a stepper motor and a hollow cathode lamp is modulated electronically. ![]() This system is applied to D 2‐lamp background correction graphite furnace atomic absorption spectrometer. A dual high‐voltage switch can modulate dc light sources under computer control. A light chopper connected to the stepper motor is controlled easily by computer. Chemistry Chemistry questions and answers with the aid of a clearly labeled diagram descibe a hollow cathode lamp commonly used ia AAS This problem has been solved You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Cathode is a cylindrical hollow tube and the anode is a rod of stainless steel. A stepper motor runs under the control of timer/counter chip independent of computer. Download scientific diagram Schematic diagram of the hollow cathode discharge tube. The timer/counter chip with 16 built‐in registers can be programmed in many modes which provides a time base for real‐time measurements. ![]() The interface card consists of a multiplexed analog‐to‐digital converter, a digital‐to‐analog converter, and a timer/counter chip. A versatile interface card for Apple IIe computer and various peripheral devices are designed to control instruments which generates transient signals like in graphite furnace atomic spectrometer. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |