Windowless Open Photoacoustic Helmholtz Cell
نویسندگان
چکیده
منابع مشابه
Windowless Open Photoacoustic Helmholtz Cell
A phenomenon which is usually considered as the main disadvantage of photoacoustic Helmholtz cells is photoacoustic background signal resulting from the light absorption by the cell windows. Although there are methods which reduce this background signal, e.g. light wavelength modulation or time domain filtering of the photoacoustic response from the sample, the methods are limited to particular...
متن کاملImproved Open Photoacoustic Helmholtz Cell
This paper presents the design of an open photoacoustic Helmholtz cell in which high acoustic volumes with quarter-wave ducts act as high-impedance separators between themainHelmholtz cell structure and the exterior. As a result, penetration of the external acoustic noise into the cell was substantially reduced in comparison to earlier open Helmholtz cell designs. Although the presented cell is...
متن کاملSignal-to-Noise Analysis of the Improved Open Photoacoustic Helmholtz Cell
Open photoacoustic cells are often used in continuous-flow photoacoustic measurements. Such cells are sensitive to external noise penetration. The improved open photoacoustic Helmholtz cell has much better external noise attenuation than the previously known designs. This paper describes how mechanical dimensions of such a cell influence its signal-to-noise ratio. The analysis was performed by ...
متن کاملClosed/Open-Cell Photoacoustic Imaging for Spectroscopic Measurements
Photoacoustic imaging using a closed photoacoustic cell and an open photoacoustic cell with gasmicrophone detection scheme was described. R/G/B LED light sources were used for the closed photoacoustic (PA) cell configuration. The colored specimen enclosed in a PA cell was imaged with R/G/B color light sources, and an image restored from the inverted PA images was compared with the original imag...
متن کاملSingle-cell photoacoustic thermometry.
A novel photoacoustic thermometric method is presented for simultaneously imaging cells and sensing their temperature. With three-seconds-per-frame imaging speed, a temperature resolution of 0.2°C was achieved in a photo-thermal cell heating experiment. Compared to other approaches, the photoacoustic thermometric method has the advantage of not requiring custom-developed temperature-sensitive b...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Acta Physica Polonica A
سال: 2008
ISSN: 0587-4246,1898-794X
DOI: 10.12693/aphyspola.114.a-211