Tag Archives: qualifcation

an error during test to your advantage

Everybody knows the Monopoly card  “a failure of the bank to your advantage, you receive…..”

An error that occurred during the vibration testing of our BiSon74-ET-RH sensors feels a bit like that.

Although the sensors were programmed to be tested to very significant levels (1g^2/Hz totalling 38.9g) it has now been confirmed that there was an error in the piloting channel that led to much higher test levels (as can be seen in the accompanying graph.

This plot (taken by the control accelerometer in Y axis) shows an integrated level of 58.77g and a spectral density which is more like 2g^2/Hz.

Although we would never have asked for such high levels of testing ourselves, it feels like an advantage to have done so, knowing that the sensors have survived.

Even THOR did not damage or senSOR

Today we finished pyroshock testing at the ISISpace THOR facility. THOR stands for Testing Hammer for extraOrdinary Rough environments. These tests were performed in frame of an ARTES 5.2 program called ITAR free extended temperature sunsensor.

3 BiSon74ET-RH sensors with two different builds were tested. These sensors went through thermal cycling and vibration testing before. In frame of this program the sensors saw 12 thermal cycles from more than +125C to less than -125C, followed by 30g sine and 40.2g random vibration tests. (al at ESTEC)

Today the test sequence was completed by administering 3 shocks of 3500g in all three directions.

Next to the BiSon74-ET-RH, the same test tests were also performed on two BiSon64 units to validate the latest configuration

As electrical tests showed that non of the units lost functionality and there was some time left in the program, ISIS agreed in doing some additional tests. This lead to a second set of tests performed on three sunsensors (1 from each batch of BiSon74-ET-RH sensors and one BiSon64) in which another 3 shocks in all three directions was administered but this time at 10.000g.

Supplier audit Airbus/OneWeb succesfully completed

Airbus / OneWeb supplier audit for fine sun sensors successful completedAfter two days of intensive auditing, today the supplier audit of Airbus/Oneweb was succesfully completed with very good results. The auditing not only comprised a carefull assessment of the procedures and way of working at Lens R&D but also included a company visit to some of our key suppliers (Boers & co and Lasertec)

After two days of information exchange, the meetings concluded with the mutual filling in of an audit matrix. Although this showed that we didn’t get the highest score on maturity for many points, this was not due to the fact that we don’t have the procedures in place or the way of working was not appreciated, but due to the fact that we were asked to offer a project specific design which has yet to be finalized.