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Flexible lock-in detection system based on synchronized computer plug-in boards applied in sensitive gas spectroscopy

Andersson, Mats LU ; Persson, Linda LU ; Svensson, Tomas LU and Svanberg, Sune LU (2007) In Review of Scientific Instruments 78(11).
Abstract
We present a flexible and compact, digital, lock-in detection system and its use in high-resolution

tunable diode laser spectroscopy. The system involves coherent sampling, and is based on the

synchronization of two data acquisition cards running on a single standard computer. A

software-controlled arbitrary waveform generator is used for laser modulation, and a four-channel

analog/digital board records detector signals. Gas spectroscopy is performed in the wavelength

modulation regime. The coherently detected signal is averaged a selected number of times before it

is stored or analyzed by software-based, lock-in techniques. Multiple harmonics of the modulation

signal 1f, 2f,... (More)
We present a flexible and compact, digital, lock-in detection system and its use in high-resolution

tunable diode laser spectroscopy. The system involves coherent sampling, and is based on the

synchronization of two data acquisition cards running on a single standard computer. A

software-controlled arbitrary waveform generator is used for laser modulation, and a four-channel

analog/digital board records detector signals. Gas spectroscopy is performed in the wavelength

modulation regime. The coherently detected signal is averaged a selected number of times before it

is stored or analyzed by software-based, lock-in techniques. Multiple harmonics of the modulation

signal 1f, 2f, 3f, 4f, etc. are available in each single data set. The sensitivity is of the order of 10−5,

being limited by interference fringes in the measurement setup. The capabilities of the system are

demonstrated by measurements of molecular oxygen in ambient air, as well as dispersed gas in

scattering materials, such as plants and human tissue. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Review of Scientific Instruments
volume
78
issue
11
publisher
American Institute of Physics
external identifiers
  • pmid:18052465
  • wos:000251325900010
  • scopus:36749031241
ISSN
1089-7623
DOI
10.1063/1.2813346
language
English
LU publication?
yes
id
f7d2a3ee-ac09-4ab8-a934-4ce62f990966 (old id 795985)
date added to LUP
2007-12-28 11:09:13
date last changed
2017-02-12 04:08:59
@article{f7d2a3ee-ac09-4ab8-a934-4ce62f990966,
  abstract     = {We present a flexible and compact, digital, lock-in detection system and its use in high-resolution<br/><br>
tunable diode laser spectroscopy. The system involves coherent sampling, and is based on the<br/><br>
synchronization of two data acquisition cards running on a single standard computer. A<br/><br>
software-controlled arbitrary waveform generator is used for laser modulation, and a four-channel<br/><br>
analog/digital board records detector signals. Gas spectroscopy is performed in the wavelength<br/><br>
modulation regime. The coherently detected signal is averaged a selected number of times before it<br/><br>
is stored or analyzed by software-based, lock-in techniques. Multiple harmonics of the modulation<br/><br>
signal 1f, 2f, 3f, 4f, etc. are available in each single data set. The sensitivity is of the order of 10−5,<br/><br>
being limited by interference fringes in the measurement setup. The capabilities of the system are<br/><br>
demonstrated by measurements of molecular oxygen in ambient air, as well as dispersed gas in<br/><br>
scattering materials, such as plants and human tissue.},
  articleno    = {113107},
  author       = {Andersson, Mats and Persson, Linda and Svensson, Tomas and Svanberg, Sune},
  issn         = {1089-7623},
  language     = {eng},
  number       = {11},
  publisher    = {American Institute of Physics},
  series       = {Review of Scientific Instruments},
  title        = {Flexible lock-in detection system based on synchronized computer plug-in boards applied in sensitive gas spectroscopy},
  url          = {http://dx.doi.org/10.1063/1.2813346},
  volume       = {78},
  year         = {2007},
}