Patent ID: 8564768

Claim:
A device for making optical measurements of a fluid at elevated pressures and temperatures, the device comprising: a body comprising a fluid pathway; a source of light; a light detector; a first lens in optical in communication with the source of light, wherein the first lens includes a spherical surface that is exposed to fluid in the fluid pathway and the first lens collimates light from the source and directs the light through the fluid pathway; a first sealing ring in contact with the spherical surface of the first lens to generate a seal between the first lens and the body; a first retainer for holding the first lens in place; a second lens in optical communication with a light detector, wherein the second lens includes a spherical surface that is exposed to fluid in the fluid pathway and the second lens directs the collimated light from the fluid pathway towards the light detector; a second sealing ring in contact with the spherical surface of the second lens to generate a seal between the second lens and the body; and a second retainer for holding the second lens in place.