THORLABS PDA20H Manuale utente

PDA20H(-EC)

PbSe Preamplified

Detector

User Guide

PbSe Preamplified Detector

Page 1 Rev F, March 11, 2015

Table of Contents

Warning Symbol Definitions .................................... 2

Description................................................................. 3

Introduction.............................................................3

MaintenanceandCare.............................................3

Setup and Operation ................................................. 4

Setup.......................................................................4

Operation................................................................4

Fiber Adapters & Other Accessories ...................... 5

Specifications ............................................................ 6

ElectricalSpecifications............................................6

GeneralSpecifications.............................................6

Photosensitivity.......................................................7

Drawing ...................................................................... 8

Regulatory.................................................................. 9

Thorlabs Worldwide Contacts................................ 10

PbSe Preamplified Detector Chapter 1: Warning Symbol Definitions

13133-D04 Page 2

Warning Symbol Definitions

Below is a list of warning symbols you may encounter in this manual or on your

device.

Symbol Description

Direct Current

Alternating Current

Both Direct and Alternating Current

Earth Ground Terminal

Protective Conductor Terminal

Frame or Chassis Terminal

Equipotentiality

On (Supply)

Off (Supply)

In Position of a Bi-Stable Push Control

Out Position of a Bi-Stable Push Control

Caution: Risk of Electric Shock

Caution: Hot Surface

Caution: Risk of Danger

Warning: Laser Radiation

Caution: Spinning Blades May Cause Harm

PbSe Preamplified Detector

Page 3 Rev F, March 11, 2015

Description

Introduction

The PDA20H is a voltage-amplified PbSe detector designed for detection of light

signals from 1.5 µm to 4.8 µm. A buffered output drives a 50 input impedance

up to ±5 V. The PDA20H housing includes a removable SM1T1 threaded coupler

that is compatible with Thorlabs SM05- (0.535”-40) and SM1-threaded (1.035”-

40) accessories. This allows convenient mounting of external optics, light filters,

and apertures, as well as providing an easy connection to Thorlabs’ cage

systems.

The PDA20H has two 8-32 tapped mounting holes with a 0.25” mounting depth

and includes a 120 VAC AC/DC power supply. The PDA20H-EC has two M4

tapped mounting holes and includes a 230 VAC AC/DC power supply.

Maintenance and Care

There are no serviceable parts in the PDA20H optical head or power supply. The

housing may be cleaned by wiping with a soft damp cloth. The window of the

detector should only be cleaned using optical grade wipes. If you suspect a

problem with your PDA20H, please call Thorlabs and an engineer will be happy

to assist you.

PbSe Preamplified Detector Chapter 3: Setup and Operation

13133-D04 Page 4

Setup and Operation

Setup

To properly unpack and assemble your PDA20H, follow the steps below.

Unpack the optical head and install a Thorlabs Ø1/2” TR post into one of the 8-32

(M4 in –EC version) tapped holes. Mount into a PH post holder.

Connect the 3-pin power supply plug into the mating receptacle on the PDA20H.

Plug the power supply into a 50 – 60 Hz, 100 – 120 VAC outlet (220 – 240 VAC

for –EC version).

Attach a 50 coaxial cable (for example, Thorlabs’ 2249-C-24) to the BNC

output port.

Note: When running cable lengths longer than 12”, we recommend terminating

the opposite end of the coax with a 50 resistor (such as Thorlabs’ item number

T4119) for maximum performance.

Operation

To power on the PDA20H, turn the POWER switch to the “I” position. (“O”

indicates the unit is off).

The light-to-voltage conversion can be estimated for a 22 C ambient

temperature by consulting the photosensitivity graph on Page 7. The data shown

is for a 50 load.

The maximum output of the PDA20H is ±10 V for high impedance loads (±5 V for

50 loads). The output signal should be below the maximum output voltage to

avoid saturation. If necessary, use external neutral density filters to reduce the

input light level.

PbSe Preamplified Detector

Page 5 Rev F, March 11, 2015

Fiber Adapters & Other Accessories

Thorlabs sells a number of accessories that are compatible with the SM05

(0.535”-40) and SM1 (1.035”-40) threads on the housing, including FC, SMA, and

ST fiber adapters, stackable lens tubes for mounting optics, and cage assemblies

that allow the detector to be incorporated into elaborate 3D optical assemblies.

CAUTION

The PDA20H was designed to allow maximum accessibility to the

photodetector by having the front surface of the diode flush with the outside

of the PDA housing. When using fiber adapters, make sure that the fiber

ferrule does not crash into the detector. Failure to do so may cause damage

to the diode and/or the fiber. An easy way to accomplish this is to install a

SM1RR retaining ring (included with the PDA20H) inside the SM1T1 threaded

coupler before installing the fiber adapter.

PbSe Preamplified Detector Chapter 5: Specifications

13133-D04 Page 6

Specifications

Electrical Specifications

Detector PbSe

Active Area 2 x 2 mm

Wavelength Range 1.5 m to 4.8 m

Peak Wavelength (λp) 4.0 m

Bandwidth (-3 dB) 0.2 Hz to 10 kHz

Rise Time (0 - 63%) 35 s

Voltage Gaina50x / 100x

Output Voltagea±5 V / ±10 V

NEPb1.5 x 10-10 W/Hz

Detectivity, D* (at λp) 1.3 x 109cm × Hz/W

Peak Sensitivity 3.0 x 103 V/W (Typ.)

1.5 x 103 V/W (Min.)

General Specifications

On / Off Switch Slide

Output BNC

Package Dimensions 2.76” x 1.70” x 0.83”

(70.1 mm x 43.2 mm x 21.1 mm)

Weight 0.15 lbs (Detector Only)

2.5 lbs (Detector and Power Supply)

Accessories SM1T1 Coupler

SM1RR Retaining Ring

Storage Temperature -25 to 70 C

Operating Temperature 10 to 40 C

AC Power Supply AC – DC Converter

Input Power

100 – 120 VAC

(220 – 240 VAC for –EC Version)

50 – 60 Hz, 5 W

Value at 50 Ωload / Value at Hi-Z load.

NEP measurement parameters: 300 K blackbody source, 600 Hz chopping

frequency, 635 Hz bandpass filter with 70 Hz noise bandwidth and 22



C ambient

temperature.

PbSe Preamplified Detector

Page 7 Rev F, March 11, 2015

Photosensitivity

Data shown in graph above is for a 50 Ωload.

PbSe Preamplified Detector Chapter 6: Drawing

13133-D04 Page 8

Drawing

0.83"

(21.1 mm)

1.70"

(43.2 mm) 1.89"

(48.0 mm)

2.10"

(53.3 mm)

1.04"

(26.4 mm)

2.76"

(70.1 mm)

0.75"

(19.1 mm)

1.03"

(26.2 mm)

0.79"

(20.1 mm)

0.50"

(12.7 mm)

Power Supply

Connection

SM05 (0.535"-40)

Internal Thread

Removable SM1T1 Threaded

Coupler with Internal SM1

(1.035"-40) Thread

Power Switch

8-32 (M4)

Tapped Holes

for Ø1/2" Posts

Power

Indicator

LED

Output BNC

PbSe Preamplified Detector

Page 9 Rev F, March 11, 2015

Regulatory

As required by the WEEE (Waste Electrical and Electronic Equipment Directive)

of the European Community and the corresponding national laws, Thorlabs offers

all end users in the EC the possibility to return “end of life” units without incurring

disposal charges.

This offer is valid for Thorlabs electrical and electronic equipment:

Sold after August 13, 2005

Marked correspondingly with the crossed out

“wheelie bin” logo (see right)

Sold to a company or institute within the EC

Currently owned by a company or institute within

the EC

Still complete, not disassembled and not

contaminated

As the WEEE directive applies to self-contained

operational electrical and electronic products, this end of life take back service

does not refer to other Thorlabs products, such as:

Pure OEM products, that means assemblies to be built into a unit by the user

(e.g. OEM laser driver cards)

Components

Mechanics and optics

Left over parts of units disassembled by the user (PCB’s, housings etc.).

If you wish to return a Thorlabs unit for waste recovery, please contact Thorlabs

or your nearest dealer for further information.

Waste Treatment is Your Own Responsibility

If you do not return an “end of life” unit to Thorlabs, you must hand it to a

company specialized in waste recovery. Do not dispose of the unit in a litter bin

or at a public waste disposal site.

Ecological Background

It is well known that WEEE pollutes the environment by releasing toxic products

during decomposition. The aim of the European RoHS directive is to reduce the

content of toxic substances in electronic products in the future.

The intent of the WEEE directive is to enforce the recycling of WEEE. A

controlled recycling of end of life products will thereby avoid negative impacts on

the environment.

Wheelie Bin Logo

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