光子计数PMT检测系统

独立PMT外壳，用于光谱的定量测量和低光强度成像

在紫外/可见/近红外光谱中，光电倍增管（PMT）是用于低光强度定量测量的理想检测器。PMT灵敏度高，具有非常宽的动态范围，因此还可以测量高光通量的光。PMT的速度也非常快，所以可以监测光信号的快速变化。另外，光电倍增管坚固耐用，使用寿命长。

HORIBA提供简单独立的PMT外壳，通过开关轻松切换模拟或光子计数模式操作，可兼容光谱范围覆盖185 – 900nm的侧向光电倍增管。对于非制冷PMT外壳，它的暗计数非常低，大约每秒50到500个计数（cps）。

事业部: 科学仪器

产品分类: 定制光谱解决方案

制造商: HORIBA Scientific

概要
配置

Key Benefits

Compact Size
Inexpensive
Operates in Analog or Photon Counting Modes
Detection from 185 to 900 nm
Complete Package
LCD display of output signal
Easy to Use

PMT's are better than photodiodes and APD's for low light detection

Although the quantum efficiency (QE) of a PMT is less than that of a silicon photodiode or avalanche photodiode (APD), a PMT has a much lower limit of low light detection due to the high current amplification (~ 107) of the electron multiplier in the PMT. It is because of this large gain and low noise that a PMT provides significantly better low light sensitivity than a photodiode or APD.

Looking for NIR Detection?

For NIR detection beyond 900 nm please take a look at our CoolOne cooled PMT housing for photomultiplier detection from 185 to 1,200 nm and also our InGaAs detectors for detection from 0.8 to 1.9 μm.

The HORIBA ambient PMT housing includes the following

On/off switch
Complete analog and photon counting circuitry
Analog or photon counting mode/output switch
Line voltage power supply
High voltage power supply
LCD display of PMT high voltage or measured analog signal
Signal out BNC connection
High voltage adjustment knob
External high voltage control input BNC connection (for optional external control)
RF shielded case
Internal socket for most 1 1/8-inch side-on photomultiplier tubes

HORIBA's photomultiplier detection system is very convenient and easy to use. It is built as a complete unit using modern design techniques and components. Everything needed to quantitate the intensity of light is packaged into a compact, attractive housing that attaches conveniently to your experiment. There are no unsightly boxes for power supplies or a multitude of cables tangled on your bench-top. The system incorporates a high voltage supply, all detector electronics, and the controls in a compact, attractive housing that also contains the PMT. You have a choice of standard PMTs to choose from or you can select from any other 1 1/8-inch side-on photomultiplier tubes that operate from -200 to -1,100 Volts DC. The PMT high voltage is shown on a digital display on the housing or you can select to show the actual analog signal from the PMT with just a flip of a switch. The high voltage can be adjusting manually or controlled externally with a signal at the “External Voltage Control” BNC. Power is delivered from an external AC adapter that is included.

Controls

All controls and displays are available on the front and side of the OBB PMT housing.

Control Specifications
	Display	LCD display of high voltage or signal
	Controls	On/Off switch Analog/Digital Mode switch Voltage/Signal Display switch Voltage Adjust potentiometer Analog Gain selection Analog Time Constant selection Analog Offset
	BNC Connectors	Signal Out External Voltage Control

Physical Specifications

Dimensions (WxDxH)	4 x 4 x 8 inches
Weight	4 lbs

High Voltage Power Supply Specifications

Input	± 15 VDC, 250 mA
High Voltage	-200 to -1,100 VDC manually adjustable LCD displays actual cathode voltage
External High	0 to +5 VDC (0 = -200 V, 5 = -1,100 V)
Voltage Adjust	Continuously adjustable
Input Regulation	± 0.05% max. (for 15 V ± 1 V input).
Load Regulation	± 0.05% max.
Ripple	100 mV p-p max.
Temperature Coefficient	± 0.01% max. (+5 to 40°C)
Drift	± 0.03%/hr. max. (after 15 minute warm-up)

Analog Mode Specifications

Gain Settings:	1 µA = 1 V 0.1 µA = 1 V 0.01 µA = 1 V 0.001 µA = 1 V
Time Constant Settings: (with Corresponding Analog Frequency)	0.05 msec (20 KHz) 0.5 msec (2 KHz) 5 msec (200 Hz) 50 msec (20 Hz) 500 msec (2 Hz)
Offset Correction:	± 50 nA
Signal Output on BNC connector:	Analog voltage

Photon Counting Mode Specifications

Linear Dynamic Range:	5 orders of magnitude*
Dead Time:	250 ns
Signal Output on BNC connector:	TTL

* Linear dynamic range of the OBB photon counting PMT housing. The intensities were produced by attenuating the fluorescence emission of a fluorescein sample with neutral density filters.