SU1404838A1 - Electronic photometer for observing quickly-moving sky objects - Google Patents

Abstract

The invention relates to practical astrophysics, in particular, intended to register a light signal under conditions of high background value when observing fast moving celestial objects. The purpose of the invention is to increase the registration accuracy. The light flux from the observed celestial object and the sky background gets into the lens and focuses in one from the coupled diaphragm version, in the other focuses the light from the sky background in the front area. Between the lens and the aperture is placed shutter. In close proximity to the diaphragm is placed a modulator driven by an electric motor. The modulator alternately blocks the aperture holes, thereby separating the light fluxes from the object + background and background in time. Then, the light fluxes through the Fabry lens fall on the photocathode of the photoelectron multiplier (PMT), in which the light fluxes are converted into current pulse flows, which are fed from the anode of the photomultiplier to the amplifier, and then to the discriminator, where the amplitude pulses are discriminated and standardized. . Thus, the converted current pulse streams arrive at the information input of the delay device and subtract the background signal. In the device, the flows from the object + the background and the background, under the control of the modulator position sensor signal, are distributed to two channels. In the background channel, a signal delay is implemented for a time, which is set by the delay time sensor. After the delay, the background stream is subtracted from the object + background stream, and the result is fed to a recording device. 1 silt. s (L QG 00 CX)

Description

The invention is intended to be used in practical astrophysical kb, in particular for recording a light signal under conditions of a high background value, when observing fast-moving celestial bodies.

The aim of the invention is to improve the accuracy of signal acquisition.

The drawing shows the block diagram of the electrophotometer.

The spectrophotometer contains a lens 1, a shutter 2, a diaphragm 3 with two holes (paired) located in the focus of the lens. The modulator 4p is located in close proximity to the diaphragm 3. The electric motor 5 is mechanically coupled to the modulator 4, Next is the Fabry 6 lens, a photomultiplier tube (PMT) 7, which is powered by a high-voltage stabilized power source 8. The output of the PMT is connected to the amplifier 9, after which the discriminator 10 stands, the digital delay device and the subtraction of the background signal II, to which the modulator position sensor 12 is connected via the driver 13 and the delay time sensor 14; the recording device 15 is connected to the output of the device.

Luminous flux from a celestial object and the sky background through the lens 1 enters one of the apertures of the diaphragm 3, the light from the sky background enters the second hole. Shutter 2 opens prior to observation. The modulator, alternately overlapping the aperture holes, separates in time the light fluxes from the object plus the background and sky background. The modulator is driven by an electric motor 5. Through the Fabry 6 lens, light fluxes are fed to the photocathode of the PMT 7. In a photoelectric multiplier, the light flux is converted into current pulses, which through amplifier 9 arrive at the discriminator 10 In the discriminator, current pulses are discriminated by amplitude, standardized and amplified arrive at the information input of the device for delaying and subtracting the signals of the background 11. In the device, according to the signals of the sensor 12

the position of the modulator formed in the imaging unit 13, the signal flow from the object plus the background and the background is distributed over two channels. The background channel implements a delay of the background signals for a time, which is determined by the delay time sensor 14, which is associated with the guiding system behind the object, and the delay time itself is determined by the time the image of the background diaphragm moves to the same point in the sky where the object is observed. Next, the background signal is subtracted from the signal from the object plus the background, and the result is fed to a recording device.

The increase in the accuracy of the registration of the signal from the object is due to the fact that the subtraction of the sky background is made from the same region of the sky where the object, Toe, is observed. the magnitude of the background that was recorded with the object, and the subtracted magnitude of the background, are the same. For example, if a star hit the diaphragm along with the object, then the signal from it will be subtracted.

Claims (1)

Invention Formula An electrophotometer for observing fast moving celestial objects, containing successively located and optically coupled lens, shutter. A paired diaphragm, a modulator with a position sensor and a driver, a photomultiplier lens and an electrically connected amplifier, a discriminator and a recording unit, differing from the fact that, in order to increase the recording accuracy, a digital delay signal and subtraction of the background signal has been introduced into it and a time delay sensor, with the output of the discriminator connected to the information input of the TSUSVF, the first control input of which is connected through the shaper to the modulator position sensor, the second control input under It is connected to the time delay sensor, and the output of the TSUSVF is connected to the recorder.