Optical analysing equipment for determining parameters of gaseous substances flowing through a duct

Optical analysing equipment for determining parameters of gaseous substances flowing through a duct, comprising:

• a light source arranged on one side of the duct,
• an optical arrangement produces, from the light of the light source, a first and a second beam,
• a light receiver which is arranged on the same side of the duct as the light source,
• calibrating channel means arranged to define a calibrating channel from the optical arrangement to the light receiver and including at least one calibrating cell into which a calibrating medium is introducible, the optical arrangement directing the first light beam through the calibrating channel means,
• measuring channel means which is arranged to define a measuring channel from the optical arrangement to the light receiver, which extends a distance into the duct and then back to the light receiver and which has an open portion for providing a measuring path of a predetermined length in the duct, the optical arrangement directing the second light beam through the measuring channel means,
• light control means by which the light receiver can be caused to selectively receive the first or the second light beam, and
• gas supply means for supplying the calibrating medium to the calibrating cell.

Optical analysing equipment for determining parameters of gaseous substances flowing through a duct, comprising:

• a fixed light source which is arranged on one side of the duct,
• a fixed optical arrangement which simultaneously produces, from the light of the light source, a first and second beam,
• a light receiver arranged opposite the light source on the other side of the duct,
• calibrating channel means extending through the duct, the fixed optical arrangement directing the first beam through the calibrating channel means to the light receiver,
• at least one calibrating cell disposed in the calibrating channel means, said calibrating cell being a separate element from said calibrating channel means and receiving a calibrating medium, the first beam passing through said calibrating cell,
• measuring channel means extending through the duct and arranged to provide a measuring path of a predetermined length in the duct, the fixed optical arrangement directing the second beam through the measuring channel means to the light receiver, and
• light control means by which the light receiver can be caused to selectively receive the first or the second light beam.

Optical analysing equipment for determining parameters of gaseous substances flowing through a duct, comprising:

• a light source arranged on one side of the duct,
• an optical arrangement produces, from the light of the light source, a first and a second beam,
• a light receiver which is arranged on the same side of the duct as the light source,
• calibrating channel means arranged to define a calibrating channel from the optical arrangement to the light receiver, the optical arrangement directing the first light beam through the calibrating channel means, said calibrating channel means being arranged outside the duct,
• at least one calibrating cell disposed in and forming a part of the calibrating channel means, said calibrating cell receiving a calibrating medium, the first beam passing through said calibrating cell,
• measuring channel means which is arranged to define a measuring channel from the optical arrangement to the light receiver, which extends a distance into the duct and then back to the light receiver and which has an open portion for providing a measuring path of a predetermined length in the duct, the optical arrangement directing the second light beam through the measuring channel means, and
• light control means by which the light receiver can be caused to selectively receive the first or second light beam.

Optical analysing equipment for determining parameters of gaseous substances flowing through a duct, comprising:

• a light source arranged on one side of the duct,
• an optical arrangement produces, from the light of the light source, a first and a second beam,
• a light receiver which is arranged on the same side of the duct as the light source,
• calibrating channel means arranged to define a calibrating channel from the optical arrangement to the light receiver, the optical arrangement directing the first light beam through the calibrating channel means, the calibrating channel means including,
• two parallel tubular members, each of the two parallel tubular members extending into the duct and having a first end spaced from walls of the duct, at least one of said two parallel tubular members forming a calibration cell, and
• means for changing the direction of the first light beam, the mean for changing being positioned at the first end of each of the two parallel tubular members,
• measuring channel means which is arranged to define a measuring channel from the optical arrangement to the light receiver, which extends a distance into the duct and then back to the light receiver and which has an open portion for providing a measuring path of a predetermined length in the duct, the optical arrangement directing the second light beam through the measuring channel means, and
• light control means by which the light receiver can be caused to selectively receive the first or second light beam.