![]() ![]() The focus of the research at CSU is investigating and characterizing the plasma produced near the hollow cathode. Reproduced from Ebdon L (1998) Introduction to Analytical Atomic Spectrometry, with permission from Wiley. 1b Hollow cathode, insert, and front view with keeper. This saved storage space and analysis time. Schematic representation of a hollow-cathode lamp. The voltage from the PMT signal amplifier is supplied through a FET analog switch. A large number of data collected during atomization period is compressed in machine code. The schematic diagram of the sample-and-hold circuit is depicted in Figure 6. A sampling rate of 16 during a signal period at 50‐Hz chopping frequency is found to be the optimum value. 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. Download scientific diagram Schematic of a hollow cathode from publication: Global Numerical Model for the Assessment of the Effect of Geometry and Operation Conditions on Insert and Orifice. Hollow cathode lamp provides analytical light line for element of interest, while nebulizer. The D 2 lamp is chopped by a mechanical chopper driven by a stepper motor and a hollow cathode lamp is modulated electronically. 2.1 Previous work on hollow cathode thrusters. SCHEMATIC DIAGRAM OF ATOMIC ABSORPTION SPECTROSCOPY (AAS). 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. A stepper motor runs under the control of timer/counter chip independent of computer. The timer/counter chip with 16 built‐in registers can be programmed in many modes which provides a time base for real‐time measurements. HCL -Hollow Cathode Lamp, MC + PMT -Synchronized Detector (photomultiplier tube mounted on monochromator). 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. ![]()
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