Author Topic: Hikvision DS-2TP31 series Thermal Camera Teardown (Read 21531 times)

Fraser · « **Reply #25 on:** April 24, 2022, 04:06:46 pm »

Hikvision cleverly incorporated a very accurate FFC shutter design that is used as a calibration reference for the microbolometer measurement process. The standard DS-2TP31 camera uses a conventional “free air” open FFC flag that is vulnerable to temperature errors at the point of flag temperature measurement. Image stacking also appears to have been employed but I do not know the exact purpose of this except to create an average sample for measurement.

I totally agree that the use of thermal imaging cameras was a mixture of science and ‘wishful thinking’ It is very difficult to accurately measure a human's core temperature at a distance, using a thermal camera.That is a topic that has been covered before on this forum though. What impressed me with ten DC-2TP31B was that the design had been enhanced in hardware and firmware to provide meaningful non contact measurements of good accuracy. How accurate the camera is over the full range of ambient temperature, I have not tested. Like some thermal camera manufacturers, Hikvision realised that a weakness in many modern budget thermal cameras was the thermal differential between the FFC flag and the temperature sensor used to enter mine it’s surface temperature. An error in this measurement is transferred to ten measurement system and introduces that error into it. Hikvision positioned a small temperature sensor in a ‘garage’ that reps the FFC shutter at a stable temperature away from air currents. The sensor obtains a reasonable measurement of the shutters surface temperature as a result. Nice idea

As the the accuracy of any master reference for temperature….. that is not known to me at this time. I can say that my test DS-2TP31B easily met the stated specification of measurement accuracy when tested against a Professional Blackbody of known accuracy and emissivity. The permitted error was +/-0.3C between 30C and 45C. My sample unit had an error of +0.1C at 40C in an ambient of 21C and this level of error starts to challenge the accuracy of the Blackbody so an error can be in the cameras measurement, or the Blackbody control loop/deviation etc.

Tim Foo · « **Reply #26 on:** February 04, 2023, 03:24:39 pm »

Before you open up your UTi260B watch this first https://youtu.be/1yYN5GsLT3w

This morning my UTi260B overheated during charging. I always monitor my USB charging and it went to something like 3.5A! That's what trigger my interest.

After disconnecting the charger, I placed the unit in a safer location (outdoors) as a precaution against any possibility of the unit going up in flames. Some spots are hot to the touch. The hottest spot is near the (finger) trigger switch is in excess of 54°C, measurement done with an IR Thermometer about 20 min after disconnection. It took me a bit of time to recompose myself after moving the unit.

5 hours latter after letting the unit to cool down, as expected that unit wouldn't startup.

I would now recommend everyone to exercise caution when charging thier UTi260Bs. It may be sensible to place the unit in some place where any fire dammage can be controlled in case the battery chargging goes wrong.

I will attempt opening the unit up very soon.

Meanwhile I am open to any advice.

vip23 · « **Reply #27 on:** September 04, 2023, 12:42:01 pm »

Hello. Found this menu, maybe it will help. Back button three times, up once.

nikitasius · « **Reply #28 on:** September 30, 2023, 09:07:55 am »

Some folks selling it 600€
The 31B model 🤣🤣

Fraser · « **Reply #29 on:** September 30, 2023, 10:46:06 am »

The DS-2TP31B model was a higher priced version of the DS-2TP31 aka E1 camera. The cost was likely due to the “COVID-19” effect on pricing and also the specialist nature of the camera. Whilst it is true that I bought several brand new DS2TP31B cameras at only £60 each, that was just one of those bargains that I stumbled across as the Pandemic began to recede and also people realised that thermal cameras were not the panacea to COVID-19 detection that they once thought they were. I have not seen that great price repeated. I believe it was a surplus dealer who had bought a large number of units and was just dumping them onto the market. He said as much to me and claimed I would never find a lower price.

It is true that the DS-2TP31B has a limited temperature measurement range but thankfully it still offers the full high sensitivity range for the actually imaging that it produces. It is still perfect for things like PCB repair where you are looking for the hot component when injecting a voltage. For £60 they were an absolute bargain. Added to that, they are very accurate for measurements between +20C and +50C which is still a useful range. They also lend themselves to spotting wildlife in the garden. I would think that they would be great for VET work as well as VETS are looking for soft tissue issues that fall within the cameras measurement capabilities.

It does not surprise me that some of these DS-2TP31B cameras are still for sale at high prices. They were not cheap to buy into stock and some dealers are trying to recover their investment so advertise them at cost of higher. They likely hope for another peak in Covid-19 events that might stimulate sales again. I will not knock someone for trying to recover their investment. Some sellers on eBay may have seen the original RRP and are thinking the cameras are still worth that sort of money. The market price of this specialist version of the DS-2TP31 is highly unstable and there are bargains to be had

I just bought the DS-2TP21B which is the bigger brother to the 31B. It is the COVID-19 fever detection version of the HikMicro M10 camera. Still 160 x 120 pixels, but a more capable camera with manual focus, touch screen, Wireless connectivity, video recording, many measurement functions, decent IFOV and it actually measures from 0C to +100C (tested by me). That has turned out to be a really nice thermal camera that is perfect for PCB work etc. I bought it, new in its hard case with two batteries, a desk charger and power supply for only £220. There is another of these cameras on eBay UK at the moment for £300. Still not a bad price for what it offers the user. The RRP on the DS-2TP21B was over 7000 Euros

It can now be bought from UK dealers for prices ranging from just over £1.5K to £3K. The prices were highly inflated during the Pandemic.

https://www.conrad.com/p/hikvision-ds-2tp21b-6avfw-ir-camera-30-up-to-45-c-160-x-120-pixel-wi-fi-fever-detection-2251776

Fraser

Fraser · « **Reply #30 on:** September 30, 2023, 10:59:59 am »

Link to the DS-2TP21B auction.

Consider the specification carefully and make your own decision on whether it offers value for money in the current market. I like mine, but that is because it meets my needs. Your needs may be different !

https://www.ebay.co.uk/itm/256066753767?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=PxmtoXM_Ryu&sssrc=4429486&ssuid=BgpdXaaLSkK&var=&widget_ver=artemis&media=COPY

He is asking £300 or offers. I tried £200 and it was declined. I believe he will more likely accept something like £280.

I have no connection to the seller or the camera they are offering.

Fraser

Fraser · « **Reply #31 on:** September 30, 2023, 11:03:36 am »

The next cheapest price I found on eBay was £549. To me that is getting into serious money for the resolution offered and I would not consider it a bargain at that price. Another seller on eBay UK wants £3.3K for this camera !

https://www.ebay.co.uk/itm/234831838047?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=P_cEFmGMRQy&sssrc=4429486&ssuid=BgpdXaaLSkK&var=&widget_ver=artemis&media=COPY

https://www.ebay.co.uk/itm/234476142785?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=L7ng4TgNRhG&sssrc=4429486&ssuid=BgpdXaaLSkK&var=&widget_ver=artemis&media=COPY

Fraser · « **Reply #32 on:** September 30, 2023, 11:07:55 am »

A refurbished HikMicro M10 that has the full measurement range plus torch and laser function active is available for £779….

https://www.ebay.co.uk/itm/235130267978?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=v18jirrrqzq&sssrc=4429486&ssuid=BgpdXaaLSkK&var=&widget_ver=artemis&media=COPY

Still serious money for a 160 x 120 pixel camera though. I provide these prices only as a guide to the market price and to show the great price variation across the market.

There are bargains to be had but you need to keep your eyes open to spot them before some else does.

Fraser · « **Reply #33 on:** September 30, 2023, 11:20:58 am »

I am not going to defend the RRP of COVID-19 fever detection versions of thermal cameras but there may be some justification in the higher prices beyond just the specialist nature of the camera version and market demand at a time of crisis.

I recently saw a comment on a UK thermal camera dealers site detailing the two available purchase options…… Ex Factory and Calibration Checked. The comment stated that thermal cameras come out of the factory without a calibration certificate as the factory production processes normally provide a camera that makes measurements that fall within its stated tolerances. It was stated that this was a belief of compliance and accuracy, rather than a proven fact….. just like CE marking ! The dealer stated that where the measurements of a cameras measurements need to be of known, proven accuracy, a calibration check and associated certificate is available at additional cost.

With the above in mind, it is plausible that the Covid-19 fever detection cameras with their claimed enhanced measurement accuracy of +/- 0.5 Celsius (+/- 0.3 Celsius if a Blackbody is used) tolerance may have undergone enhanced calibration at the time of production to ensure accuracy. Such calibration can be time consuming so additional cost of production may result. I have no insight into the production of the fever detection versions of cameras beyond noting the hardware enhancements that were employed to improve measurement accuracy.

As a side note, the DS-2TP21B provides a measurement calibration enhancement option in the menu. The camera is pointed at a known accurate Blackbody with Emissivity, distance and temperature known, and a measurement calibration correction is stored. A nice feature to have and one not offered on the DS-2TP31B camera. Such a user accessible feature would be great on all thermal imaging cameras that are capable of taking temperature measurements.

Fraser · « **Reply #34 on:** September 30, 2023, 11:52:44 am »

To show how times have changed….I was watching an auction for a Guide IR T120H COVID-19 fever detection camera as the priced dropped over time. The camera is from the guide IR entry level series so is pretty basic. The resolution is 120 x 90 pixels provided by the Guide Sensmart TIM120 core. The “H” version firmware is heavily modified and offers two modes of operation to detect Fever in humans….. Portrait mode and bulk surveillance mode (my terms, not Guide’s). The portrait mode provides the outline of a face that the user must align with the person being tested. The bulk surveillance mode is more like a normal thermal camera and the measurement function highlights hottest target in view. The temperature measurement range is restricted to improve accuracy. Sadly only one colour palette is available and it is tuned fir fever detection

I saw that the T120H that I was watching had dropped to £80 on eBay. Some years ago I would have bought that in the blink of an eye…. But not any more. My analysis of that camera was that it’s 120 x 90 pixels was a serious restriction on its usefulness when the wide FOV lens was also considered. The fact that there was only the one colour pallet was a real downer for me, and this was a very basic camera that may be purchased from China for around £200 in its normal T120 general use format. I considered £80 too much to pay for a thermal camera with such limitations. The market has virtually exploded with affordable thermal imaging cameras so we can afford to be picky when it comes to hunting for bargains

Someone bought the £80 T120H camera after it being listed for many weeks. Their use case may mean that it was an excellent buy for them. I certainly hope so. That camera could be used for PCB work if a close up lens were fitted. £80 is not much to pay for the benefit that a thermal camera provides when examining faulty laptops etc. Absolute temperature measurements are less important than seeing hot spots worthy of further investigation.

https://www.ebay.co.uk/itm/295942607142

Some may recall that I bought two camera modules from Dahua fever detection tablet kiosks. The seller did not know what they were and I took a risk that the cores within the metal casings might be useful. It turned out that the two metal camera cases contained the Guide IR MobIR AIR USB C thermal camera Dongles. They contain the same TIMO 120 core as the T120H camera. The cameras work with a mobile phone but are the fever detection model so need the fever detection APP for accurate temperature measurements. They work with the standard MobIR AIR APP but measurements are incorrect. Each of those Dahua camera modules cost me only £18.

As a warning though….. I have investigated other Fever Detection kiosk solutions and determined that they use sensors like the Melexis MLX series that provide resolutions of only 32 x 24 pixels, or even less, with a slow response time. Be careful what you buy …. Do your research !

Fraser

nikitasius · « **Reply #35 on:** September 30, 2023, 06:24:14 pm »

Thanks for info Fraser 👍
But i still wanna find 17um hikvision for less than 80€ 😁
It's kind of fun, négociations etc.

nikitasius · « **Reply #36 on:** September 30, 2023, 08:54:49 pm »

Just got brandnew 31B for 80€ + 7€ (delivery & insurance).
Well, lets see next week if it's match the description, online is always risky 😁

nikitasius · « **Reply #37 on:** October 06, 2023, 07:17:09 pm »

Here is my Hikvision DS-2TP31B-3AUF

Thanks Fraser to show me this pearl, it's awesome camera!

And for 87€ (delivery included) it rocks!

Here is gdrive https://drive.google.com/drive/folders/1Meb7P2H3lyOa8La_MXdfiYTKUNFuYO-3

Upd: compared 17μm pixel w/ 12μm w/ hand on the wall
https://drive.google.com/file/d/1NP0NU7LH1SF9pdlrSCEn-YjvY02wud7L/view

nikitasius · « **Reply #38 on:** October 07, 2023, 05:59:24 pm »

Well, even if it display 25-45 range in UI it saves full range.
On last picture it's a tea from Tefal's teapot (w/ green tea inside).
89.7°C could be pretty close to real.

All pictures i took w/ default settings

Fraser · « **Reply #39 on:** October 07, 2023, 06:51:40 pm »

Yes, I noticed that the saved images are fully radiometric and contain the full temperature range rather than the limited one shown on the display. As Bill-W commented, it is likely that the firmware was just changed to only show the Fever Scanning range of temperatures and I hoped to modify the firmware to eliminate that restriction on measurement. Sadly Hikvision firmware updates are encrypted so I have not been able to dig into them. With regard to accuracy, I believe much of the accuracy gains come from the use of a better FFC flag as a temperature reference and likely a factory calibration that is targeted at the fever detection temperature range to achieve greatest accuracy. Such a limited range calibration sill locks the Radiance to Temperature unit curve to the values that came out of ten microbolometer ROIC at time of calibration. The accuracy at temperatures higher and lower than that restricted range will still be pretty accurate

I really like the DS-2TP31 camera. It is well built and produces very good images co side ring it’s 160 x 120 pixel resolution. Hikvision chose wiseLy when it came to the lens FOV. From memory, the IFOV is similar to one of my 320 x 240 pixel cameras that are fitted with much wider angle lenses. I have used my camera for PCB thermal imaging and it does benefit from a close up lens and produces good imagery. That said, I recently bought the DS-2TP21B (basically a modified HikMicro M10) for £220. The 21B is also 160 x 120 pixel resolution but it has the advantage of a manual focus lens and large touch screen display

The close focus capability of the 21B lens means I do not need a close up lens for PCB work

The 21B and 31B are well worth considering if found at a good price, as was the case for me and you Nikitasius

I used the DS-2TP21B to diagnose a shorted MLCC in a £5000 rugged laptop this week. It makes life soooo easy

I own a FLIR E40 (upgraded to E60+) but would not hesitate to pick up the 21B, or even the 31B for a PCB repair. As a side note, it is interesting that the 21B allows the display of temperatures outside the fever detection range, yet the 31B does not.

Fraser

nikitasius · « **Reply #40 on:** October 07, 2023, 08:52:55 pm »

I've seen the forum you posted where folks discuss about modding hikvision firmwares. There almost 50+ pages to read lol 🤓
I will read next week to see where we are and is there are any progress to do w/ that firmware.

Btw here is mine (S/N photoshopped).
Aren't updated yet:
• maybe there are exploits for the old firmwares
• maybe i can make telnet working, there are option in settings but i see no telnet, ever no com via usb (like i have w/ chinese walkietalkies).

nikitasius · « **Reply #41 on:** October 08, 2023, 05:30:38 pm »

Quote from: tisher on January 25, 2022, 10:48:39 am

Any news with configuration file unlock?
Other Hikvision thermal camera use ftp for access
http://ftp.hikvision.ru/01.%20Firmware/01.%20Hikvision/10.%20Thermal/2.%20How%20to/07%20System/

And...
http://ftp.hikvision.ru/01.%20Firmware/01.%20Hikvision/10.%20Thermal/2.%20How%20to/07%20System/How%20to%20get%20thermal%20information%20by%20serial%20port.pdf

Or we can try to repack firmware with some changes
https://ipcamtalk.com/threads/hikvision-firmware-tools-change-language-extract-files-and-create-own-firmware.2664/

Well, just checked, it doesn't unpack E1 firmwares.
We need hik_pack by leecher which is wiped out from ipcamtalk forum. If to do easy way.

nikitasius · « **Reply #42 on:** October 08, 2023, 06:04:53 pm »

Here is our header 02KH https://ipcamtalk.com/threads/02kh-firmware-header.10313/

Here is an example about 03KH https://ipcamtalk.com/threads/you-go-hang-zhou-r6-camera-ds-2cd2x42-firmware-encoding-method.11516/

vip23 · « **Reply #43 on:** April 22, 2024, 11:20:44 am »

The time and date settings are lost. Can you tell me what battery is installed?

Fraser · « **Reply #44 on:** April 22, 2024, 07:36:58 pm »

These cameras often use a rechargeable Lithium cell so yours may just need the camera to be used to recharge the cell.

If the cell has failed (which would be surprising for these cells) you can just measure it’s dimensions and buy the nearest physical size of tagged rechargeable Lithium button cell that you can find.

https://www.sii.co.jp/en/me/battery/products/ms-lithium-2/#:~:text=OUTLINE,and%20highly%20stable%20overdischarge%20characteristics.

Fraser · « **Reply #45 on:** April 22, 2024, 09:05:28 pm »

I just checked my image archives for this camera and the cell is a "ML" series rechargeable LiMnO2 type. You just need the cells dimensions to match it to the correct cell in the series (dimensions form the part number as with non-rechargeable Lithium button cells). Useful details are provided in the Wiki page for button cells.

https://en.wikipedia.org/wiki/Button_cell

The cell should not have failed this soon so it would be worth checking that it is not just discharged due to a lack of use. Also check that the cells very low current trickle charging circuit is working to keep it charged whilst the camera is in use.

Fraser · « **Reply #46 on:** April 22, 2024, 10:19:01 pm »

A possible candidate for this cell….. the ML414H

https://www.sii.co.jp/en/me/datasheets/ms-rechargeable/ml414h/

pixar · « **Reply #47 on:** May 09, 2024, 09:18:34 am »

Hi together,

Fraser, thanks for your awesome teardown. I am following you already with the FLIR E4 hack and now also tried to play around with the Hikvision.

Some insights from me:
- next to the UART port that looks like a port for ethernet, not sure how useful this is, but potentially can be used to play around more
- the things you can do with UART are pretty limited. Hikvision asks for a password pretty soon if you want to go into the "debug" mode (similar to here: https://ipcamtalk.com/threads/hikvision-ds-7816nb-how-to-enter-debug-mode.55472/)

These are the supported commands:


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Author Topic: Hikvision DS-2TP31 series Thermal Camera Teardown (Read 21531 times)

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