Biomedical subjects

E N Stenow

Publications and source records attributed to E N Stenow.

3 recordsLinked to original sources

PubMed1996

Optical aspects of a fibre-optic sensor for respiratory rate monitoring.

A new sensor for respiratory rate monitoring is described. The sensor uses an optical fibre that detects the evaporated humidity from the mouth and/or nose at each exhalation. The condensed humidity substantially alters the coupling of light from the optical fibre to the surrounding medium, which can be monitored by a photo-detector. The sensing principle is evaluated using ray-tracing simulation and scattering measurements.

Computer Simulation↗

PubMed1994

Design and evaluation of a fibre-optic sensor for limb blood flow measurements.

A fibre-optic microbending sensor for clinical use in venous occlusion plethysmography (VOP) has been developed. The sensor utilizes the microbending principle to detect the volume expansion of a limb following venous occlusion. This principle is based on the loss of energy in an optical fibre that undergoes mechanical perturbations. A comparative study of 10 healthy subjects has been made between the new fibre-optic sensor and a mercury strain-gauge sensor. Each subject's limb blood flow was recorded 10 times. The two sensor types were positioned closely together on the same limb. The result of the study shows a high correlation (r = 0.949) verifying that the fibre-optic sensor's performance makes it a suitable alternative to the mercury strain-gauge sensor.

Adult↗

PubMed1993

Venous occlusion plethysmography using a fiber-optic sensor.

This paper presents the results of comparative testing of a fiber-optic sensor used as an alternative to the mercury strain-gauge in a clinically well-established technique for limb blood flow assessment, venous occlusion plethysmography. In this research the measurement of volume changes following venous occlusion has been performed with a variety of methods including the commonly used mercury strain-gauge. Temperature drift and long-term instability are problems associated with the mercury strain-gauge. In addition, environmental protection authorities are prohibiting the marketing of mercury sensors, beginning in 1993. Evaluation and optimization of the fiber optic microbending sensor is described in detail. Comparison with the mercury strain-gauge sensor is made for in lower limb blood flow measurements.

Equipment Design↗