PMID- 25085179
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20150520
LR  - 20140802
IS  - 1089-7623 (Electronic)
IS  - 0034-6748 (Linking)
VI  - 85
IP  - 7
DP  - 2014 Jul
TI  - Optical system for liquid level measurements.
PG  - 075113
LID - 10.1063/1.4890437 [doi]
AB  - This work describes the development of a novel laser instrument for non-contact 
      liquid level measurements. The physical principle of operation is based on the 
      self-mixing effect induced in the laser diode by modulating the laser wavelength. 
      The frequency main tone of the resulting fringes is proportional to the absolute 
      target distance. A high speed FPGA (Field Programmable Gate Array) electronic 
      performs the data acquisition and elaboration. The high elaboration/acquisition 
      speed improves the chance of acquiring good signal also on a moving liquid 
      target. The optical characteristics of the liquid surface have been studied in 
      order to identify the optimal optical configuration when the surface is flat as 
      well as when the surface is rippled. The final low-cost instrument works in real 
      time and is able to track a filling process with 2.5 cm/s of speed, with 
      resolution better than 1 mm for distances up to 50 cm.
FAU - Melchionni, D
AU  - Melchionni D
AD  - Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, 
      Milan, Italy.
FAU - Norgia, M
AU  - Norgia M
AD  - Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, 
      Milan, Italy.
LA  - eng
PT  - Journal Article
PL  - United States
TA  - Rev Sci Instrum
JT  - The Review of scientific instruments
JID - 0405571
EDAT- 2014/08/03 06:00
MHDA- 2014/08/03 06:01
CRDT- 2014/08/03 06:00
PHST- 2014/08/03 06:00 [entrez]
PHST- 2014/08/03 06:00 [pubmed]
PHST- 2014/08/03 06:01 [medline]
AID - 10.1063/1.4890437 [doi]
PST - ppublish
SO  - Rev Sci Instrum. 2014 Jul;85(7):075113. doi: 10.1063/1.4890437.