Radiation pyrometers

Claim 2

Temperature measuring apparatus comprising detector means for generating an electrical signal having a magnitude proportional to the intensity of radiant energy impinging thereon; means for conducting radiant energy from a body subjected to temperature measurement to said detector means including an optical component adapted to lie in the optical path between said body and said detector means, said component being capable of transmitting radiant energy impinging thereon; and means adapted to be interposed between the optical component and the body subjected to temperature measurement for keeping foreign material from collecting on said component, said last-mentioned means comprising a housing surrounding said optical component; interface means in said housing adjacent said optical component for keeping foreign material from reaching said component; means in said housing on the opposite side of said last-mentioned means from said optical component providing an annular plenum; means providing an inlet to said housing and to said plenum; means providing outlets through which fluid can flow from said plenum into said housing; a first baffle means in said housing for directing fluid exiting through said outlets across said interface means to keep foreign material from collecting thereon, said first baffle means having an aperture through which radiant energy can pass to said interface means; means providing a fluid outlet from said housing along the optical path through which energy emitted from the body subjected to temperature measurement can pass; and a second baffle means in said housing for directing fluid exiting from said plenum first into entraining relationship with the fluid directed across said interface means and then through the outlet from the housing, said second baffle means also being apertured so that radiant energy can pass therethrough to said interface means.

Claim 3

Temperature measuring apparatus comprising detector means for generating an electrical signal having a magnitude proportional to the intensity of radiant energy impinging thereon, means for conducting radiant energy from a body subjected to temperature measurement to said detector means, and filter means in the optical path between said body and said detector means for keeping from said detector means energy having wavelengths longer than a specified maximum wavelength and thereby making said apparatus insensitive to changes in the temperature of the detector means, the means for conducting radiant energy to the detector means including a fiber optics device having one end adjacent said detector means and a lens in the optical path between the body subjected to temperature measurement and the fiber optics device for focusing radiant energy emitted from said body onto the outer end of the fiber optics device, said apparatus further including means adapted to be between the lens and the body subjected to temperature measurement for keeping foreign material from collecting on said lens which comprises a housing surrounding said lens; an interface window in said housing adjacent said lens for keeping foreign material from reaching said lens; means in said housing on the opposite side of said window from said lens providing an annular plenum; means providing an inlet to said housing and to said plenum; means providing outlets through which fluid can flow from said plenum into said housing; a first baffle means in said housing for directing fluid exiting through said outlets across said interface window to keep foreign material from collecting thereon, said first baffle means having an aperture through which radiant energy can pass to said window; means providing a fluid outlet from said housing along the optical path through which energy emitted from the body subjected to temperature meansurement can pass; and a second baffle means in said housing for directing fluid exiting from said plenum first into entraining relationship with the fluid directed across said interface window and then through the outlet from the housing, said second baffle means also being apertured so that radiant energy can pass therethrough to said interface window.

Claim 4

Temperature measuring apparatus comprising detector means for generating an electrical signal having a magnitude proportional to the intensity of radiant energy impinging thereon, means for conducting radiant energy from a body subjected to temperature measurement to said detector means, and filter means in the optical path between said body and said detector means for keeping from said detector means energy having wavelengths longer than a specified maximum wavelength and thereby making said apparatus insensitive to changes in the temperature of the detector means, the means for conducting radiant energy to the detector means including a fiber optics device having one end adjacent said detector means and a lens in the optical path between the body subjected to temperature measurement and the fiber optics device for focusing radiant energy emitted from said body onto the outer end of the fiber optics device, said apparatus further including means adapted to be between the lens and the body subjected to temperature measurement for keeping foreign material from collecting on said lens which comprises a housing surrounding said lens; an interface window in said housing adjacent said lens for keeping foreign material from reaching said lens; means in said housing on the opposite side of said window from said lens providing an annular plenum; means providing an inlet to said housing and to said plenum; means providing outlets through which fluid can flow from said plenum into said housing; a first baffle means in said housing for directing fluid exiting through said outlets across said interface window to keep foreign material from collecting thereon, said first baffle means having an aperture through which radiant energy can pass to said window; means providing a fluid outlet from said housing along the optical path through which energy emitted from the body subjected to temperature meansurement can pass; and a second baffle means in said housing for directing fluid exiting from said plenum first into entraining relationship with the fluid directed across said interface window and then through the outlet from the housing, said second baffle means also being apertured so that radiant energy can pass therethrough to said interface window.