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• W55363375 abstract "Self-mixing laser sensors require few components and can be used to measure distance, vibration, velocity, and flow. The self-mixing sensor is based on a laser which is both the source of radiation and the detector; a portion of the emitted radiation is reflected from the target and re-enters the laser leading to observable variations in the optical power and laser terminal voltages.Vertical-Cavity Surface-Emitting Lasers (VCSELs) have low threshold currents which make them suitable for portable, battery powered devices. However, the terminal voltage variations in VCSEL based self-mixing sensors are small (of the order of 1 mV). Due to the absence of suitable off-the-shelf laser drivers for driving VCSELs such that the small terminal voltgage variations can be acquired, a custom laser driver and amplifier was designed and characterised. This driver opened up the possibility of a range of new experiments with VCSEL based self-mixing sensors.In order to be able to better understand the outcomes of experiments, an accurate model of the self-mixing effect is beneficial. Although there has been many mathematical models in the literature to describe the self-mixing effect, a practically useful model has not been described in a complete manner. I seek to present a complete, easily replicable, self-mixing model to accurately model self-mixing sensors.Theoretical models are only as good as the model parameters used. It is therefore important to characterise real lasers so that models can accurately mimic their behaviour. Key characteristics for self-mixing laser sensors are the signal-to-noise ratio (SNR) and the beam profile. Insufficient SNR will prevent the quantity of interest from being obtained. I provide insight into parameters that effect the SNR and attempt to elucidate the phenomena responsible for the SNR variations. I compare several different beam profiling methods and reconcile the results from the different methods. The beam-profile has a strong effect on the spectrum obtained from a self-mixing velocity sensor.The self-mixing velocimetry sensor relies on scattering of the incoming beam which also leads to a dynamic speckle effect. This speckle effect leads to random variations in the phase and amplitude of the self-mixing velocimetry signal. I provide a theoretial treatment of the speckle effect to allow its influence to be modelled. The theoretical model is then compared to experimental signals that validates the model.The self-mixing flow sensor operates on a similar principle to the self-mixing velocimetermlight scattered off the fluid causes variations in the self-mixing signal that is proportional to the fluid flow rate. Although flow sensors have been demonstrated several times, self-mixing flow sensors have drawbacks that need to be addressed before they become more practically useful. We provide several methods that have been demonstrated to improve the performance of self-mixing flow sensors. These include a rapid scanning system that allows fluid flow to be acquired continuously to generate a flow profile for a relatively large number of points in a matter of seconds. We also demonstrate the use of aVCSEL array that allow flow to be acquired from a plurality of lasers in parallel to reduce acquisition times. Finally, a system based on a blue-emitting GaN laser is described that provides increased flow velocity resolution allowing the resolution of smaller flow rates than can be achieved by the more typical longer wavelength lasers." @default.
• W55363375 created "2016-06-24" @default.
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• W55363375 date "2012-01-01" @default.
• W55363375 modified "2023-09-27" @default.
• W55363375 title "Self-mixing laser sensors: modelling and performance improvements" @default.
• W55363375 hasPublicationYear "2012" @default.
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