Fluid evaluation apparatus and method, computer program, and recording medium

A fluid evaluation method in a fluid evaluation apparatus including:

• an irradiator configured to irradiate a fluid with light, and a light receiver configured to receive scattered light from the fluid and configured to output a light receiving signal, said fluid evaluation method comprising:
• mapping an input point, that is on a first plane defined by a light amount and a frequency, on a second plane defined by a flow volume of the fluid and a concentration of the fluid by transformation to determine at least one of the flow volume and the concentration,
• wherein the light amount and the frequency are respectively indicated by light amount information, which indicates the light amount of the scattered light included in the light receiving signal, and by frequency information, which indicates the frequency associated with a beat signal caused by a Doppler shift of the light included in the light receiving signal.

A non-transitory computer readable medium recording a computer program for making a computer, which is provided in a fluid evaluation apparatus including:

• an irradiator configured to irradiate a fluid with light, and a light receiver configured to receive scattered light from the fluid and configured to output a light receiving signal, perform a method comprising:
• mapping an input point, that is on a first plane defined by a light amount and a frequency, on a second plane defined by a flow volume of the fluid and a concentration of the fluid by transformation to determine at least one of the flow volume and the concentration,
• wherein the light amount and the frequency are respectively indicated by light amount information, which indicates the light amount of the scattered light included in the light receiving signal, and by frequency information, which indicates the frequency associated with a beat signal caused by a Doppler shift of the light included in the light receiving signal.