Answers are grounded in this paper and cite their sources.
Instrumental study reveals a fourfold noise reduction with a dual-beam laser deflection sensor, indicating that active feedback is required to overcome laser pointing instability.
A compact, dual-beam laser deflection system was built, mainly from commercially available parts. While the detector and electronics yielded noise levels at the theoretical level for the detector, pointing instability of the laser led to an increase in noise by a factor of about 103. The dual-beam arrangement gave only a factor of about 4 improvement over the single-beam mode due to alignment and drift problems. Further improvement requires a feedback system to minimize signal arising from common-mode beam displacements.
No takes yet. Share an insight, caveat, or question.
Pawliszyn et al. (1985) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: