This paper deals with a design procedure of pneumatic pressure probes in frequency domain by using Brown's line model. The technique may be summarized as follows;
1. The frequency response of the probe can be presented by non-dimensional three parameters.
2. If the non-dimensional parameter Ω₁(=a√ω₁/ν) is constant (a: radius of line, ν: kinematic viscosity, ω₁: fundamental natural angular frequency), the gain of pressure probe at ω=ω₁, |G_c(jω₁)|, also becomes constant.
3. When Ω₁=2.44, the gain |G_c(jω₁)| becomes 0.707. This is the most suitable condition for the pressure measurments in frequency and time domains.
The characteristics of the probe are evaluated by experiments, and excellent results are obtained.