Sensors multi-parameter

The sensors discussed in this Chapter are dealt with in five sections. The first three (Sections 4.2-4.4) are devoted to single-parameter sensors, which are dealt with in increasing order of use (viz. those involving a gas-liquid, liquid-liquid or liquid-solid interface). A further distinction is made according to the type of detector involved. Section 4.5 is concerned with multi-parameter sensors, which are still unfortunately much less common. 

Sensors allowing two or more analytes to be determined by a simple procedure are technically more complex than single-parameter sensors, but also more advantageous, which justifies the R D endeavours devoted to them. Few multi-parameter sensors have so far been developed, however, and even fewer are actually operative, of which those commercially available are included. Progress in this area is therefore much needed and desired. Multideterminations based on sensors can be accomplished (a) by using a detector capable of distinguishing the signal produeed by each analyte, whether as... 

Depending on their sensing ability, flow-through sensors can be classified into single-parameter and multi-parameter according to whether they can sense one or more analytes on passage of each sample. Multideterminations usually rely on the use of an instrument e.g. a diode array spectrophotometer) for virtually simultaneous multidetection e.g. [20]). 

Such an ISFET was originally used for detecting pH changes but by casting with ion selective membranes a lot of different ion-selective sensors can be obtained in principle [38,39]. Even a multi-parameter electrolyte sensitive chip for clinical applications was invented [39]. 

L. Torsi, A. Dodabalapur, L. Sabbatini, and P. G. Zambonin, Multi-parameter gas sensors based on organic thin-film transistors , Sensors And Actuators B - Chemical 67, 312 (2000). 

For the group of sensors and portable instruments, the cost assessment is illustrated for an UV photometer, a colorimetric test kit as well as a multi-parameter probe... 

Sanders, S.T., T. P. Jenkins, and R. K. Hanson. 2000. Diode-laser sensor system for multi-parameter measurements in pulse detonation engine flows. AIAA Paper No. 2000-3592. 

Figure 10. Schematic of proposed SOA-based fiber laser sensor system for multi-parameter sensing, in which FBGi and FBG2 are taken as vibration/temperature and humidity sensors, respectively. FBG3 and FBG4 are two wavelength-matched reference FBGs. 1-km long fiber used in sensor system is to verify a remote sensing ability of system...

Udd, E. [2007]. Review of multi-parameter fiber grating sensors. Proceedings of SPIE in Fiber Optic Sensors and Applications V, Vol. 6770, SPIE, Boston, MA, USA, pp. 1-10. 

N. Yazdi, A. Mason, K. Najafi, K.D. Wise, A generic interface chip for capacitive sensors in low-power multi-parameter microsystems. Sensors and Actuators A Physical... 

Lawrence C M, Nelson D V, Makino A et al., Modeling of the multi-parameter Bragg grating sensor . In Proc. SPIE - Third Pacific Northwest Fiber Optic Sensor Workshop, 1997, 3180, 42-9. 

In many remote-sensing applications the number of measurements Nf exceeds the number of retrieved parameters This is characteristic of new advanced sensors with multi-spectral, multi-angle [20-23, etc.], and polarimetric... 

The planned project features a multi-sensor approach as it will gather data on physical, chemical and biological anomalies over a wide range of frequencies and parameters in a single measuring campaign. 

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