Tandem demodulation lock-in amplifier based on digital signal processor for dual-modulated spectroscopy

2009 ◽  
Vol 80 (3) ◽  
pp. 033112 ◽  
Author(s):  
Jianhuan Qin ◽  
Zhiming Huang ◽  
Yujian Ge ◽  
Yun Hou ◽  
Junhao Chu
Keyword(s):  
Digital Signal Processor ◽  
Digital Signal ◽  
Lock In ◽  
Signal Processor

A modular, low-cost, digital signal processor-based lock-in card for measuring optical attenuation

2001 ◽  
Vol 72 (1) ◽  
pp. 247-251 ◽  
Author(s):  
L. A. Barragán ◽  
J. I. Artigas ◽  
R. Alonso ◽  
F. Villuendas
Keyword(s):  
Digital Signal Processor ◽  
Low Cost ◽  
Digital Signal ◽  
Optical Attenuation ◽  
Lock In ◽  
Signal Processor

Digital lock in amplifier: study, design and development with a digital signal processor

2004 ◽  
Vol 28 (4) ◽  
pp. 157-162 ◽  
Author(s):  
Javier Gaspar ◽  
Suei Feng Chen ◽  
Alejandro Gordillo ◽  
Mateo Hepp ◽  
Pablo Ferreyra ◽  
...  
Keyword(s):  
Study Design ◽  
Digital Signal Processor ◽  
Digital Signal ◽  
Design And Development ◽  
Lock In ◽  
Signal Processor

Step-Scanning Interferometer with Digital Signal Processing

1993 ◽  
Vol 47 (9) ◽  
pp. 1345-1349 ◽  
Author(s):  
Christopher J. Manning ◽  
Peter R. Griffiths
Keyword(s):  
Signal Processing ◽  
Digital Signal Processing ◽  
Digital Signal Processor ◽  
Modulation Frequency ◽  
Depth Profiling ◽  
Digital Signal ◽  
Scanning Interferometer ◽  
Ft Ir ◽  
Lock In ◽  
Signal Processor

A novel step-scan FT-IR spectrometer incorporating a digital signal processor for demodulation of the detector signal is described. The potential advantages of this method of signal processing are discussed and illustrated. The instrument is based on a commercial cube-corner interferometer which has been modified by replacement of the drive motor with a stepper motor-micrometer and piezoelectric transducer combination. The interferometer retardation is feedback controlled by a 486–50 personal computer, which also controls the digital signal processor and collects spectral data. More than one phase modulation frequency can be imposed simultaneously, allowing for a multiplex advantage in photoacoustic depth profiling. Digital signal processing allows for simultaneous demodulation of multiple frequencies which would normally require several lock-in amplifiers. Data that illustrate the feasibility of these concepts are presented. The suitability of this instrument for double-modulation step-scan FT-IR measurements such as polymer stretching and electrochemically modulated step-scan FT-IR is also discussed.

High Voltage Driver for RSFQ Digital Signal Processor

2007 ◽  
Vol 17 (2) ◽  
pp. 470-473 ◽  
Author(s):  
Igor I. Soloviev ◽  
M. Raihan Rafique ◽  
Henrik Engseth ◽  
Anna Kidiyarova-Shevchenko
Keyword(s):  
High Voltage ◽  
Digital Signal Processor ◽  
Digital Signal ◽  
Signal Processor
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