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Auto-optic recording pyrometer
464
CURRENT TOPICS
and equipment until the rocket is ready to be fired. The shelter has twelve 30-ft. aluminum panels which are shaped like the petals of a flower. After installation, they radiate from a circle around the missile. When preliminary adjustments on the missile are completed, synchronized motors raise the panels, closing them around the rocket. When the missile is ready for firing, electronicequipment takes over, causing the panels to open up and return to the ground. Doors in the 30-ft. sections allow workers to go inside for inspection of the launching apparatus. Other openings carry fuel lines to the missile. The interior of the shelter is coated with a paint capable of resisting temperatures of over 1000 F. The engineering firm of Barnes and Reinecke, Incorporated, Chicago, Illinois, holds the principal Army contract for production of the shelter. Auto-Optic Recording Pyrometer.An optical recording pyrometer that can measure extremely high temperatures with milliseconds response time has been announced by Avco Research and Advanced Development Division of Wilmington, Mass. Developed to measure the high surface temperatures of sample materials exposed to Avco’s 10,000 C. electric-arc air-heater, the new pyrometer may be operated unattended when conditions are hazardous to personnel. Even under adverse conditions such as an electric-arc experiment, the pyrometer has given reliable measurements of sample brightness temperatures within f20 C. It accurately measures surface changes in temperature over an area of $-in. diameter in the range of 1400 C. to 3000 C. A recorder may be plugged into the pyrometer to provide a complete record
[J. F. I.
of temperature versus time for the entire operation. Called the Auto-Optic Recording Pyrometer, the radiation-sensitive element is a high-vacuum phototube. Monochromatic light of wavelength 0.65 micron is focused upon an opaque plate having a small opening which admits the radiant energy to the phototube. The phototube output is amplified by a highly stable amplifier mounted in the pyrometer housing. The output may be read on the builtin meter or from an external recorder. A remote recorder attached to the pyrometer is used by Avco to study high-temperature properties of new materials being developed for possible use on space vehicles. The instrument is calibrated by comparing the output with the known brightness temperature of a standard tungsten lamp. TASI Will Double the Capacity of Submarine Telephone Cables.-&4 new system which will increase the number of telephone conversations carried by underseas telephone cables perhaps by as much as two times is under development at Bell Telephone Laboratories. The system is called TASI, which stands for Time Assignment Speech Interpolation. In a normal two-way telephone conversation, one person on the average will be speaking only half the time, and even while he is speaking, there will be significant gaps and pauses in his speech. Thus, if the two directions of transmission are separated, each transmission path is idle, on the average, more than half the time. If two conversations are interlaced to take advantage of these gaps, greater use can be made of existing transmission facilities. It is this interlacing process which leads to the designation Time Assignment Speech Interpolation.
CURRENT TOPICS
and equipment until the rocket is ready to be fired. The shelter has twelve 30-ft. aluminum panels which are shaped like the petals of a flower. After installation, they radiate from a circle around the missile. When preliminary adjustments on the missile are completed, synchronized motors raise the panels, closing them around the rocket. When the missile is ready for firing, electronicequipment takes over, causing the panels to open up and return to the ground. Doors in the 30-ft. sections allow workers to go inside for inspection of the launching apparatus. Other openings carry fuel lines to the missile. The interior of the shelter is coated with a paint capable of resisting temperatures of over 1000 F. The engineering firm of Barnes and Reinecke, Incorporated, Chicago, Illinois, holds the principal Army contract for production of the shelter. Auto-Optic Recording Pyrometer.An optical recording pyrometer that can measure extremely high temperatures with milliseconds response time has been announced by Avco Research and Advanced Development Division of Wilmington, Mass. Developed to measure the high surface temperatures of sample materials exposed to Avco’s 10,000 C. electric-arc air-heater, the new pyrometer may be operated unattended when conditions are hazardous to personnel. Even under adverse conditions such as an electric-arc experiment, the pyrometer has given reliable measurements of sample brightness temperatures within f20 C. It accurately measures surface changes in temperature over an area of $-in. diameter in the range of 1400 C. to 3000 C. A recorder may be plugged into the pyrometer to provide a complete record
[J. F. I.
of temperature versus time for the entire operation. Called the Auto-Optic Recording Pyrometer, the radiation-sensitive element is a high-vacuum phototube. Monochromatic light of wavelength 0.65 micron is focused upon an opaque plate having a small opening which admits the radiant energy to the phototube. The phototube output is amplified by a highly stable amplifier mounted in the pyrometer housing. The output may be read on the builtin meter or from an external recorder. A remote recorder attached to the pyrometer is used by Avco to study high-temperature properties of new materials being developed for possible use on space vehicles. The instrument is calibrated by comparing the output with the known brightness temperature of a standard tungsten lamp. TASI Will Double the Capacity of Submarine Telephone Cables.-&4 new system which will increase the number of telephone conversations carried by underseas telephone cables perhaps by as much as two times is under development at Bell Telephone Laboratories. The system is called TASI, which stands for Time Assignment Speech Interpolation. In a normal two-way telephone conversation, one person on the average will be speaking only half the time, and even while he is speaking, there will be significant gaps and pauses in his speech. Thus, if the two directions of transmission are separated, each transmission path is idle, on the average, more than half the time. If two conversations are interlaced to take advantage of these gaps, greater use can be made of existing transmission facilities. It is this interlacing process which leads to the designation Time Assignment Speech Interpolation.