Dual PMT detector

A dual PMT detector is a device that uses two photomultiplier tubes as detection elements. PMT is a vacuum electronic device characterized by high sensitivity and high gain. When the photocathode surface is illuminated, photoelectrons are released due to the photoelectric effect. These photoelectrons undergo continuous multiplication in the multiplication stage, thereby amplifying the electrons and ultimately outputting a current signal through the anode.

The dual PMT detector is a highly sensitive photoelectric detection device that combines the characteristics of photomultiplier tubes (PMT) to achieve accurate measurement and detection of weak light signals. It mainly consists of two photomultiplier tubes, each with an independent photocathode, multiplication system, and anode output structure. This design enables the detector to simultaneously or separately receive and process two different optical signal sources, improving the flexibility and efficiency of detection.

1、 Working principle

When the light signal is irradiated onto the photocathode of PMT, due to the photoelectric effect, the photocathode will release photoelectrons. These photoelectrons undergo a series of multiplication stages to reach the anode and output a current signal. Due to the high gain characteristic of PMT, even very weak optical signals can be effectively amplified and converted into measurable electrical signals.

In a dual PMT detector, two PMTs can work independently or collaboratively. When two PMT receive optical signals simultaneously, simultaneous measurement and comparison of the two signals can be achieved; When it is necessary to measure light signals in different directions or with different characteristics separately, two PMT can be used for detection.

2、 Performance characteristics

1. High sensitivity: able to detect very weak light signals. The dual PMT detector further improves the sensitivity of detection through dual path detection.

2. High gain: The multiplication system can achieve continuous multiplication of electrons, greatly enhancing the strength of the signal. This enables it to effectively amplify and process weak signals.

3. Fast response: PMT has a fast response time and can respond in real-time to changes in optical signals.

4. Good stability: The structural design of PMT gives it good stability and reliability, enabling it to maintain stable performance over long periods of operation.

3、 Application Fields

Dual PMT detectors are widely used in scientific research, industrial production, and medical fields. In the field of scientific research, it can be used for weak light signal measurement and spectral analysis in physics, chemistry, biology and other fields; In industrial production, it can be used for photoelectric detection, optical measurement, and quality control; In the medical field, it can be used for applications such as biological imaging, fluorescence detection, and photodynamic therapy.

4、 Main parameters

Wavelength range: 120~320nm

Wavelength repeatability accuracy: 0.05nm

Calibration accuracy: 0.01nm

Stability:<0.5% @ per hour

Sample detector rotation range: 10 ° -180 °

System vacuum degree: 5x10-3Pa

Chopping frequency: 90Hz

Deuterium lamp light source: MgF2 window, power consumption 200W

Sample rotation angle: 9-60 °

Lock in amplifier full-scale input sensitivity (current input): 10Fa-10mA

⼊ Mouth slit \ \ Mouth slit \ \ Precision online adjustable width: 120~320nm

Detector: Dual PMT detector (sample PMT detector and reference light PMT detector)