FAQ's (Frequently Asked Questions)


Can I look directly at a laser beam with a Find-R-Scope
®?

Are laser safety glasses required when using the Find-R-Scope®?

Can I see the infrared laser beam in "mid-air" with a Find-R-Scope?

Can I get a video output directly from my Find-R-Scope® ?

Is there a way I can save images from my Find-R-Scope® ?

I seem to have a problem focusing the viewer?

What is the minimum temperature at which Infrared Viewers will display objects based on the object’s own emitted energy?

My Find-R-Scope® has an unusual battery that is a silver tube aproximately 1” in diameter x 2.5” long?

I have a vintage Find-R-Scope® that has a battery for which I cannot find a replacement

I have just replaced my battery and the viewer is not working?

My viewer stopped working. Is there anything I can do to determine what is wrong?

I believe that my Find-R-Scope® needs repair. What can I do?

How do I return a Find-R-Scope® to FJW for evaluation and repair?

Is there a minimum charge for FJW to evaluate and repair my unit?

The display on my viewer continues to glow green even after the power switch is switched off. Is there something wrong?

Q: Can I look directly at a laser beam with a Find-R-Scope® ?

A:   Do not look at the beam directly with the Find-R-Scope®. The Find-R-Scope® is not to be considered a safety device. Find-R-Scope® viewers are not intended to withstand high-power laser emissions. Always wear required eye protection when using the Find-R-Scope®.

Q: Are laser safety glasses required when using the Find-R-Scope® ?

A:   Yes, laser safety equipment is required when using a Find-R-Scope®. A Find-R-Scope® Viewer is not intended to be used as, nor does it perform as eye-safety equipment. Infrared viewers are not designed to withstand high power laser beams. The Find-R-Scope® has been designed to be used with safety eyewear and still provide an excellent view of the infrared image.

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Q: Can I see the infrared laser beam in "mid-air" with a Find-R-Scope?

A:   No, not really, except under very specific conditions.

First of all, one should ask “How do we see light?” We see light when it is radiated directly at us from its source, or when it is reflected directly at us by an object or interface. We do not see it when it is traveling through the air, (for example, from left to right in front of us), unless it is reflected towards us by an object or particulate matter within the air.

One common example of seeing light reflected towards us by suspended particulate would be when we see automobile headlights reflecting off the billions of water droplets suspended within a cloud of fog. However, in a perfectly clean room with no suspended particulate in the air, we could not see a beam of light moving past us.

Some people may be fooled to think we can see lasers in mid-air because we have all seen photos of laser systems that show the laser path in mid-air. These have all been taken using some reflective medium in the path such a fog, smoke, etc.

Infrared viewers are often used to display the laser beam profile and placement once it has reflected off of a non-specular object such as a white cardboard, etc.
                                               

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Q: Can I get a video output directly from my Find-R-Scope® ?

A:   Yes, certain models have built-in video outputs. The Electronic Find-R-Scope® model numbers 89400 and 89400P, the Thermal Viewer model 89600, and the Infrared Viewer/Camera models 85400, 85345, 86400 and 86345 have a standard video output.

For models that do not have a standard video output, you can replace the eyepiece with the optional FJW model 85643 Video Relay Assembly and attach a miniature CCD camera to the relay. FJW offers model 85291 Miniature CCD Camera for this purpose.

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Q: Is there a way I can save images from my Find-R-Scope® ?

A:   Yes! If you have a viewer model with a video output or CCD camera attached. (See “Can I get a video output directly from my Find-R-Scope® ?” above.)

There are two typical ways to save images. You can use a video recorder to save the video output, or you can use the video output to feed a Video Capture/Frame Grabber card in your computer.

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Q: I seem to have a problem focusing the viewer?

A:   The Find-R-Scope® has two elements that need to be adjusted for optimum focus. It has the objective lens on the front of the instrument, and the diopter adjustment within the eyepiece. This eyepiece control enables nearsighted or farsighted users to make dioptric adjustments to the eyepiece. The diopter is adjusted by turning the rubber eyeshield.

Most users use a three step process for best focus. To focus, point the viewer at your target and focus the objective lens on your target as best as possible. Next, adjust the diopter control until the target is in best focus. Finally, while continuing to view your target, focus the objective lens on your target for best focus.

As an alternative, you can perform this three step process first on a different target that has a high contrast edge (such as printed text). This will allow you to pre-adjust the diopter to your particular eye. After using this method to adjust the diopter to your eye, when you look at your actual target you will simply need to adjust the objective lens on your target.

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Q: What is the minimum temperature at which Infrared Viewers will display objects based on the object’s own emitted energy?    

A:   It varies depending on the instrument’s spectral sensitivity and the emissivity of the emitting object. Please refer to Technical Note 103 in the Tech Support page of this Web site. It contains a Table and discussion of the minimum temperature at which objects can be observed based on their own temperature. If you want to image your target based on temperature, consider our 85770 Infrared Imager.          

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Q: My Find-R-Scope® has an unusual battery that is a silver tube aproximately 1” in diameter x 2.5” long?

A:   Don’t feel bad, many individuals make this mistake. The “battery” described is not actually a battery at all. It is the high voltage power supply. This is the component that boosts the battery voltage from 1.5 Volts up to 12,000 Volts. It can also be identified by a serial number and the letters “FJW” engraved on its outer shell. To help identify this item and the proper battery for your system, review Tehnical Note 104 available in the Tech Support page on this site.                                                                                 

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Q: I have a vintage Find-R-Scope® that has a battery for which I cannot find a replacement. 

A:   Because the Find-R-Scope® products typically have a very long life, there are units that are in the field that once used mercury batteries. For environmental reasons, these batteries are no longer available. To confirm your battery type and to determine your battery upgrade solution, please refer to Technical Note 104 in the Tech Support page of this Web site. It contains photos to confirm which style unit you have and explains the path to upgrade your unit to accept a standard C-cell battery.                                                            

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Q: Can the Find-R-Scope® be valuable in art restoration and detecting art fraud?

A:   Yes! The most popular models for these applications are model 85700 which is sensitive from 400-1800 nm, and the 85706 which is sensitive from 400-2200 nm. They have been used to view under-drawings, detect artist changes in the drawing/style of work, and to see the condition of painting beneath an obscuring layer of darkened varnish or over-glazing. In addition, sometimes inscriptions are more legible. They have also proved useful in document restoration applications.

Please refer to
Technical Note 107 in the Tech Support page of this Web site. It contains more details about this application including details on pigment characteristics.                                   

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Q: I will not be using the viewer for a while, are there any special storage requirements?

A:   We suggest that you remove the battery from the Find-R-Scope® and store the viewer in its carrying case.  

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Q: I have just replaced my battery and the viewer is not working?

A:   Because many common flashlights have a spring contact on the negative end of the battery, it may appear that the battery negative terminal should be pointing towards the spring in the end cap of the Find-R-Scope®. This is not correct!

To properly replace the battery, the tip or positive terminal of the battery should be pointing towards the spring in the end cap. There should be a label inside the end cap tube showing the proper battery orientation. If you have any questions, please feel free to contact us.                           
              

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Q: My Find-R-Scope® stopped working. Is there anything I can do to determine specifically what is wrong?

A:   Make sure that the battery is fresh. (Please read, “I have just replaced my battery and the viewer is not working?”). After confirming that the fresh battery is installed properly, make sure that the switch is in the “on” position and the lens cap is off. If there is ambient light in the room observe if the tube displays a green image. If not, with the switch in the “on” position, put the instrument up to your ear and listen for a high pitched whine. If you do not hear the whine, it would appear that the power supply is inoperative. (Note: Only viewers shipped before May of 2009 will make the whining sound. Newer units do not make this sound.) If you have confirmed that a fresh battery is properly installed, then the lack of the power supply whine may be due to a failed switch, a broken wire, or a faulty power supply. If you can hear the power supply whine but the tube does not light, it is possible that there is a broken wire or the Image Converter Tube has failed.

The best way to ascertain the exact problem is to send it to FJW for evaluation. In this way you will not have the risk of replacing the wrong part.                                                                          

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Q: I believe that my Find-R-Scope® needs repair. What can I do?

A:   First read “My Find-R-Scope® stopped working. Is there anything I can do to determine what is wrong?” which is listed above. If your battery is good and in place correctly and the unit still does not work, you should return it to FJW Optical Systems, Inc. for evaluation and repair. To accomplish that read “How do I return a Find-R-Scope® to FJW for evaluation and repair?” that is listed below.

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Q: How do I return a Find-R-Scope® to FJW for evaluation and repair?

A:   Print the RMA form on this website, complete the form and fax or e-mail it to us. We will respond to you with an RMA number and shipping instructions. Make sure to safely pack your unit, (preferably in its carrying case and then inside a shipping carton), and mark the outside of your package with the RMA number.

      RMA Request Form

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Q: Is there a minimum charge for FJW to evaluate and repair my unit?

A:   After you receive an RMA number and return your unit to FJW, we will troubleshoot and evaluate your unit. Once your unit is evaluated, and before proceeding with any additional work, we will call you and report our findings and your cost to repair the unit. If the unit is still within its limited warranty period, there is no charge for covered repairs.                                                                                                    

For units or repairs that are not covered by the limited warranty, there is a $50.00 charge to troubleshoot/evaluate each unit. If you decide to proceed with the repair, and the repair charge is greater than $295.00, then the $50.00 evaluation fee will be waived. If you choose not to repair the unit, the $50.00 evaluation fee applies.

      RMA Request Form

It is your responsibility to ship the unit to us. For repairs made under the limited warranty, FJW will pay for standard return shipping to you. For complete Limited Warranty details, see Terms & Conditions      

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Q: The display on my viewer continues to glow green even after the power switch is switched off. Is there something wrong?

A: No, it is normal for the viewer to continue to operate for some period of time after the switch is turned off.

More Detail:
The Infrared and UV Viewers use an image conversion tube. These tubes are sensitive from the UV through visible, and into the near IR. When the viewer is switched on, the Image Conversion Tube is charged by the Battery and 12,000 volt Power Supply. If the lens cap is still on the viewer there will be no visible change within the eyepiece, it will remain dark. If the lens cap is removed and the viewer is switched on (in a normally lit room), the phosphor display screen in the eyepiece will light up, (turning a brighter green).

To determine if the High-Voltage Power Supply is energized by the Battery and is currently charging the tube, hold the viewer near your ear. You should hear a high pitched whine when the power supply is operating. When you turn the switch off, the whine will stop.

Because the Image Conversion Tube acts like a capacitor and will hold a charge, the unit will continue to operate for some time after the switch is turned off. It will operate until the Image Conversion Tube becomes mostly discharged. The brighter the scene that the viewer sees, the faster the tube will discharge and the display will fade.

 

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