Some considerations on S/N from the FFT amplitude-frequency spectrum of an ICP source

High-Resolution Fourier transform spectrometer to identify the rotational structure of the B2.SIGMA.u+-X2.SIGMA.g+ transition of N2+(0,0) in a helium inductively coupled plasma

“…Provided electronic noise is minimized, the limiting noise in the FT-ICP system will be the plasma. Several papers (14)(15)(16)(17)(18) have discussed sources of noise in argon ICP's.…”

A numerical simulation and high-speed photographic study of the audio-frequency noise in an analytical ICP source

“…Since the 1980s, the characteristic emission spectrum [4][5][6][7][8][9][10][11][12][13][14][15] of ICP-OES and the ion signal of ICP-MS at a xed m/z value 7, [16][17][18][19][20][21] have been recorded with high time resolution. The signal noise power spectra were calculated using fast Fourier transformation (FFT), and then white noise, icker noise and interference noise were identied.…”

“…noise is found to depend on torch design, 6,9,12,14,15,18,19,23 operating parameters (r.f. power, 4,7,11,12,16,17,19,20 coolant gas ow rate 4,7,9,12,16,17,19 ) and sampling depth (in ICP-MS 16,17,23 ). Meanwhile, the frequency seems independent of the sample gas ow rate, observation height (in ICP-OES) or spatial location.…”

Noise characteristics in inductively coupled plasma optical emission spectrometry using slurry nebulization and direct powder introduction techniques

“…Other than with solutions, the noise of the ICP-OES when applied to slurries has hardly been investigated as a function of the instrumental operating parameters. Indeed, the noise characteristics of ICP-OES for solutions have already been discussed in a number of studies (3)(4)(5)(6)(7)(8)(9)(10)(11). Three major types of noise have been identified in ICP-OES, in relation to their frequency and intensity range, i.e.…”

“…A significant problem in the operation of any type of cracking plant is the formation of carbonaceous deposits (termed coke) on the catalyst (5,6). These deposits eventually deactivate the catalyst and require removal of the coke before the catalyst can be reused.…”