Photoelectric pyrometer for measuring temperature of bodies of small cross-sectional dimensions which vary with respect to optical axis of pyrometer

摘要

Disclosure is made of a photoelectric pyrometer for measuring the temperature of bodies of small cross-sectional dimensions which vary with respect to the optical axis of the pyrometer. The pyrometer comprises, in successive arrangement, an objective, a stationary field diaphragm, a slit obturator, an aperture diaphragm, a condenser sighted at the aperture of the stationary field diaphragm, and a photoelectric converter arranged in the sharp image plane of the condenser. The light-sensitive surface of the photoelectric converter receives two trains of light pulses. One of these pulse trains is formed by the above-mentioned units, whereas the other is formed by the obturator arranged across the path of a luminous flux generated by an optical feedback radiation source. The photoelectric converter produces two trains of trapezoidal electric pulses of a variable duration and on-off ratio. For accurate measurement of the amplitude of these pulses, provision is made for a device whose purpose is to convert the amplified electric pulses into square pulses of a fixed duration and an amplitude equal to that in the middles of the amplified electric pulses. The device has its input connected to an output of an amplifier, whereas outputs of the device are connected to inputs of a storage and comparison device.