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  • #13 - Spirometer

Labs Idea #13: Spirometer

  • Motivation/Summary
  • Approach/Measurement
  • Implementation

Author: Sensirion Innovations Team
March 2018


Motivation/Summary

A spirometer is used for lung function testing. The exhaled air volume is plotted against time to identify lung diseases such as COPD, asthma and others. It is a simple, quick, and painless way to check lungs and airways. Traditional analog sensing technologies with paddle wheels or turbines could be substituted by digital low cost sensing technologies, whithout sacrificing accuracy specifications. To meet accuracy requirements Sensirion's thermal flow sensor calibrated for differential pressure provides an attractive solution at lower cost than many ultrasonic sensors.


Approach/Measurement

Sensirion's differential pressure sensor is a semiconductor MEMS version of the traditional hot wire anemometer. The sensing principle is based on thermal conductivity of the gas flowing over the sensor surface (Figure 1).

Figure 1: Thermal measurement principle

As opposed to diaphragm based differential pressure sensors, Sensirion's CMOSens differential pressure sensor characteristic shows high sensitivity especially at low differential pressures (Figure 2). This allows to reliably measure ultra-low flows or differential pressures.

Figure 2: Sensirion sensors are more sensitive at low differential pressures than diaphragm type pressure sensors

To measure the exhaled air flow the differential pressure sensor was attached to a spirometer tube in bypass configuration (Figure 3).

Figure 3: SDPxxx differential pressure sensor attached to a flow tube in bypass configuration
Spirometer prototype. SDP8xx sensor connected to a spirometer flow tube

For easy cleaning of the flow tube this spirometer design study using Sensirion's SDP3x differential pressure sensor is detachable from the spirometer tube (Figure 4).

Figure 4: SDP3x differential pressure sensor detachable from 3D printed prototype flow tube

The measurement results demonstrate that Sensirion's differential pressure sensor can be used as a flow sensor in spirometers due to its high sensitivity even at lowest flows (Figure 5).

Figure 5: Recorded signal of person breathing through spirometer prototype

Conclusion

  • Sensirion's SDP3x differential pressure sensor in bypass configuration proves to be highly sensitive for pulmonary function testing.
  • Sensor is detachable from the flow tube housing, making the spirometer body fully washable.

Implementation

Sensirion's SDP3x differential pressure sensor or EK-P4 evaluation kit can be sourced from distributors listed on the Sensirion website.


Patent Information

No information or recommendation presented on this website do absolve you from the obligation of investigating the possibility of infringement of third parties’ rights and, if necessary, clarifying the position.


Related Products to this Article

Sensirion Differential Pressure Sensors SDP3x

Differential Pressure Sensor SDP3x

The SDP3x differential pressure sensor measures just 5mm x 8mm x 5mm, opening up new dimensions of integration and applications possibilities. It features excellent accuracy and long-term stability.

Sensirion Differential Pressure EK-P4 1

Evaluation Kit EK-P4

The evaluation kit EK-P4 enables an easy and cost-efficient evaluation and qualification of Sensirion's SDP3x differential pressure sensors. Test now the features of the differential pressure sensor.


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