Final answer:
Infrared gas analyzers, mass spectrometers, and photoacoustic gas analyzers can be used for breath-by-breath measurements of CO2, with infrared gas analyzers being the most commonly used for this purpose.
Step-by-step explanation:
For breath-by-breath measurements of CO2, the type of gas analyzer suited for this application would typically be an Infrared gas analyzer. This device can detect and measure the amount of carbon dioxide in a breath due to the characteristic absorption of infrared light by CO2 molecules. It is often used in medical and exercise physiology contexts to assess the metabolic rate and respiratory function. The Mass spectrometer can also be utilized to measure CO2 as it can differentiate and quantify gases based on their mass-to-charge ratio. The Photoacoustic gas analyzer uses the photoacoustic effect to measure gas concentration and can be applied for CO2 measurement. However, the Paramagnetic gas analyzer, which relies on the paramagnetic properties of oxygen, is primarily used for measuring oxygen levels, not carbon dioxide.