Temperature-constant photon counter

Abstract

The invention relates to a temperature-constant photon counter composed of a mechanism part and a circuit part. the counter is characterized by comprising a shielding darkroom, a temperature constant structure, a circuit board fixing structure and a photon measuring structure; the shielding darkroom is composed of a pedestal, and a front end cap, a rear end cap, a shielding tube, a lens, a base block and a panel connector fixed on the pedestal; the temperature constant structure comprises a radiating fin, a fan, springs, a semiconductor cooling sheet, a conduction block and a temperature sensor; the circuit board fixing structure comprises a support plate and a partition plate fixed on the base block; and the photon measuring structure comprises a photomultiplier, a base circuit board, a power socket, a signal socket, a control circuit board, a signal processing circuit board and a high-voltage circuit board. The temperature-constant photon counter is compact in structure, small in size, narrow in temperature fluctuation, high in reliability, low in electromagnetic interference, low in dark counting and suitable for photon measuring and counting in food, medical and chemical industries.

Description

Technical field: [0001] The invention relates to the technical field of photon measuring equipment, in particular to a constant temperature photon counter especially suitable for measuring and counting photons in food, medicine and chemical industry. Background technique: [0002] Photon counters are widely used in medical, food, and chemical fields. It can be used for quantitative measurements, wavelength-specific photon testing, etc. Because the photomultiplier tube is greatly affected by the ambient temperature, sometimes some measurements require high dark noise. Therefore, it is an effective measure to use a semiconductor refrigeration chip with Peltier effect for constant temperature treatment. In addition, the photomultiplier tube environment electromagnetic field interference Cause unstable work, so multi-layer electromagnetic shielding should be considered. The existing device has the following disadvantages: (1) no constant temperature control system, greatly aff...

AI Technical Summary

Problems solved by technology

Because the photomultiplier tube is greatly affected by the ambient temperature, sometimes some measurements require high dark noise. Therefore, it is an effective measure to use a semiconductor refrigeration chip with Peltier effect for constant temperature treatment. In addition, the photomultiplier tube environment electromagnetic field interference Cause unstable work, so multi-layer electromagnetic shielding should be considered

The existing device has the following disadvantages: (1) no constant temperature control system, greatly affected by ambient temperature; (2) poor shielding, greatly affected by external electromagnetic interference; (3) not compact structure, large volume

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