SU1375955A1 - Photometer - Google Patents

Abstract

The invention relates to optoelectronic instrumentation and can provide, in photometry, polarimetry, spectrometry, measurement of the intensity of radiation sources with regard to the background of the sky KocNOT4ecKoro. The purpose of the invention is to improve the measurement accuracy and expand the range of the objects under study. The photometer contains an inclined oscillating mirror aperture installed along the beam, a light filter unit, a lens, a photo receiver, a synchronization unit, a register, a visual guide, on the axis of which behind the aperture there is an illuminator associated with the synchronization unit. According to the synchronization block signal, the diaphragm moves from one extreme position to another. At the same time, only the extreme positions of the diaphragm are interrupted during the measurement movement time. 2 Il. S (l

Description

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The invention relates to optoelectronic instrument making and can be used in photometry, polarimetry, spectrometry, and astrophysics to measure the intensity of radiation sources, taking into account the background of the cosmic sky.

The purpose of the invention is to improve the measurement accuracy and expand the range of the objects under study.

Fig. 1 shows the block diagram of the photometer in Fig. 2, a timing diagram of the control of the synchronization unit.

The photometer contains an inclined mirror oscillating diaphragm 1, a light filter unit 2, a lens 3, a photodetector 4, a recording device 5, which includes a shaping amplifier 6, a counter 7, a register 8, and also a synchronization unit 9, an illuminator 10 designed to illuminate the aperture, and visual guide 1 1.

The photometer works as follows.

The radiation from the object under study and the background is separated by the oscillating diaphragm 1 and is transmitted through the optical filters 2, the lens 3 to the photo receiver 4, which is switched on in the photon counting mode. The pulses from the output of the photodetector arrive at the recording device 5, where they are formed on the amplifier-shaper 6, then arrive at the counting input of the counter 7. At the same time, the synchronization unit 9 generates a sequence of signals according to the timing diagram / Fig.2 |,

Figure 2 shows the waveforms generated by the synchronization unit: 12 is the counter lock signal, 13 is the write signal to the register, 14 is the counter reset signal, 15 is the aperture illumination signal.

At certain intervals, the meter 7 is polled. In this case, the blocking input is blocked by the blocking signal 12. After the time D required to establish transients in the counter, a write signal 13 is generated in the register, after which the counter is zeroed by the reset signal 14. Simultaneously with the blocking signal 12, the aperture illumination signal 15 is operated and supplied to the illuminator 10. The duration of the blocking signal must be longer than the duration of the aperture illuminating signal for a time, which consists of a delay of the afterglow of the illuminator, a natural delay of the photodetector, and a delay of the amplifier —former . Introducing a delay of AND eliminates the ingress of scattered light from the illuminator to the photodetector during the measurement of the investigated luminous flux.

Counter polling frequency (which is equal to the illumination illuminator frequency). should be chosen such that the luminous flux from the illuminator is greater than the threshold of mirror stimulation / eye (approximately 50 quanta / s).

 According to the signal of the synchronization unit 9, the diaphragm 1 moves from one extreme position to the other. At the same time, at the time of moving the measurement, the illumination of the diaphragm is interrupted and turned off; therefore, only the extreme positions of the diaphragm are visible.

Claims (1)

Formula of the invention A photometer containing an inclined mirror aperture arranged along the beam; a lens unit; a photodetector; a recording device including a series-connected amplifier-former, a counter and a register; a synchronization unit connected to the register and actuator of the movement of the mirror aperture; and a visual guide, This is due to the fact that, in order to improve the measurement accuracy and expand the range of the objects under study, an illuminator located on the optical axis of the visual guide behind the mirror aperture, and the synchronization unit is connected to the counter and illuminator. i1 and 1375955 (