SU934242A1 - Multirange photometer - Google Patents

Description

one

The invention relates to a technique for measuring the intensity of radiation, namely, pulsed and continuous radiation, and can be used in photometers with a wide dynamic range.

Known multilimit photometer containing the photodetector, the unit for automatic selection of the measurement limit and the recorder 1.

The closest technical solution to the invention is a multi-limiting photometer comprising a series-connected photodetector, an automatic measuring limit selection unit and a recording unit, the automatic measuring limit selection block made in the form of a resistive divider, each of the n outputs of which are connected to the input of one of the n comparators, the other inputs of which are connected to the source of the reference voltage, and the outputs are connected to the registration unit and the decipher with analog keys at output 2.

A disadvantage of the known device is the limited speed due to the time-sequential search of the measurement limit.

The purpose of the invention is to increase speed.

To achieve this goal in a multi-range photometer containing series-connected photoretector,

5 an automatic measurement limit selection unit and a registration unit, the automatic measurement limit selection unit is made in the form of a resistive divider, each of whose n outputs are connected to the home of one of the n comparators, the other inputs of which are connected to a source of reference voltage, and the outputs are connected to the block registration and decoder with analog keys on the output, the input of the resistive divider is connected to the output of the photodetector,

15 and n its outputs through the corresponding analog keys of the decoder are connected to the input of the registration unit.

The drawing shows a diagram of the device.

2Q The device contains a series-connected photodetector 1, a unit 2 for automatic selection of the measurement limit, and a unit 3 for registration. The unit 2 for automatic selection of the measurement limit is made, in the form of a resistive divider 4, each of

The n outputs of which are connected to the input of one nz n Comparators 5, the other inputs of which are connected to the source 6 of the reference voltage 6, and the outputs are connected to the recording unit 3 and the decoder 7 with the analog keys 8 on the output. The input of the resistive divider 4 is connected to the output of the photodetector 1, and n its outputs through the corresponding analog keys 8 of the decoder 7 are connected to the input of the recording unit 3. The decoder can be, for example, performed on the elements HE 9 and 10, through the elements 10 and the corresponding outputs of the comparators 5 are connected to the inputs of analog switches 8, and the second inputs of the elements 10 and 10 are connected to the outputs of the elements HE 9, whose input is connected to the output of the neighboring comparator .

The device works as follows.

The magnitude of the reference voltage is chosen equal to the conditional lowest measurement limit. If the output signal of the photodetector 1 does not exceed the conditional lower limit, then the output signals of all the comparators 5 are zero, as well as the output signals of all the corresponding elements I. Consequently, the analog key elements 8 are disconnected, except for the key element of the output A.E. photodetector 1, which is closed by a single signal of the corresponding element HE 9. Thus, the output signal of the photoreceiver 1 is directly transmitted to block 3 of registration.

If the output signal of the photodetector 1 exceeds a decimal order, the lower conditional limit or becomes equal to it, then the corresponding comparator 5, connected by an electrical input directly to the output of the photodetector 1, will form a single signal. With this single signal, after its inversion, the previously closed analog key is opened and the adjacent single key of the corresponding element And 10 is simultaneously closed, the adjacent analog key connected to the output of the first stage divider is closed. Further

the measurement process continues in a known manner.

As the output signal of the photodetector 1 changes, the corresponding comparators 5 operate, according to which signals

only one of the analog keys 8 is closed.

The signals of the comparators 5 simultaneously indicate the scale of the conversion of the measured value, which are transmitted to the block

3 registrations.

The invention allows the selection of the limit directly in the measurement cycle with a small delay in time due to the speed of the key and logic elements and comparators, thereby

The photometer's response speed increases over a wide range of measured values.

Claims (2)

Invention Formula A multilimit photometer containing a series-connected photodetector, an automatic measuring limit selection unit and a recording unit, the automatic measuring limit selection block made in the form of a resistive divider, each of whose n outputs is connected to the input of one of the n comparators, the other inputs of which are connected to the reference voltage source and outputs with a registration unit and a decoder with analog output keys, characterized in that, in order to increase its speed, the resistive input is bodies connected to the output of the photodetector and its n outputs via respective analog switches decoder connected to the input of the recording unit. Sources of information taken into account during the examination 1. US Patent No. 3972626, cl. G 01 J 1/44, published 1976. 2. G. Sh. Bikmurzin. Amplifier with automatic selection of the gain factor. “Instruments and Experimental Technique, 1980, No. 5, p. 114-115 (prototype).