2004
DOI: 10.1117/12.523267
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Optimum injection current waveform for a laser rangefinder based on the self-mixing effect

Abstract: In a self-mixing type laser range finder the current of the laser is modulated with a triangle wave to produce a range of optical frequencies. However, the electrical signal does not produce a perfect linear sweep in optical frequency due to thermal and other effects in the laser. This leads to errors in the accuracy and resolution of the range finder. In this paper, we describe and implement a method in software to systematically determine the optimal shape of the injected waveform needed to eliminate these t… Show more

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Cited by 9 publications
(4 citation statements)
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“…The frequency modulation is typically achieved by modulating the laser bias current with an ostensibly triangular waveform [6]. In practice, the laser frequency does not change linearly with current, and the triangle waveform is usually predistorted to compensate for thermal and other effects to produce a linear frequency sweep [38,50]. However, for illustrative purposes we will assume a linear link between current changes and frequency changes.…”
Section: B Absolute Distancementioning
confidence: 99%
See 1 more Smart Citation
“…The frequency modulation is typically achieved by modulating the laser bias current with an ostensibly triangular waveform [6]. In practice, the laser frequency does not change linearly with current, and the triangle waveform is usually predistorted to compensate for thermal and other effects to produce a linear frequency sweep [38,50]. However, for illustrative purposes we will assume a linear link between current changes and frequency changes.…”
Section: B Absolute Distancementioning
confidence: 99%
“…Numerical solution of this equation provides important insight into the way a self-mixing sensor functions. The excess-phase equation has been used to estimate semiconductor laser parameters under weak feedback [36] to improve the accuracy of a self-mixing sensor by utilizing fringe loss information (predicted by the model as the level of feedback increases) [37] and to compensate for thermal effects in laser range-finding applications [38].…”
Section: Introductionmentioning
confidence: 99%
“…However the dynamic effect of the heat introduced due to current modulation was not investigated. Agnew et al in [47] carried the detailed investigation on variation in temperature and emission frequency due to thermal effect; Bertling in [49] describes variation of temperature with measurement time; and the thermal coefficient variations with the monitoring time interval after changing the magnitude of injected current is described in [46].…”
Section: Introductionmentioning
confidence: 99%
“…An alternative method of acquiring the average peak spacing has been described in previous papers [15][16][17]. This method detects the average frequency of the peak occurrence in the frequency domain.…”
Section: Application To Displacement and Range Findingmentioning
confidence: 99%